Home

John Torkelson

Group Members

Research

Publications

Patents

Group Publications

2022

S. Hu, X. Chen, M. Bin Rusayyis, N.S. Purwanto and J.M. Torkelson, "Reprocessable polyhydroxyurethane networks reinforced with reactive polyhedral oligomeric silsesquioxanes (POSS) and exhibiting excellent elevated temperature creep resistance", Polymer, 252, 124971 (2022). [Link]

M. Bin Rusayyis and J.M. Torkelson, "Reprocessable and recyclable chain-growth polymer networks based on dynamic hindered urea bonds", ACS Macro Lett., 11, 4, 568-574 (2022). [Link]

B. Chen and J.M. Torkelson, "Development of rigid amorphous fraction in cold-crystallized syndiotactic polystyrene films confined near the nanoscale: Novel analysis via ellipsometry", J. Polym. Sci., 60, 10, 1631-1642 (2022). [Link]

C. Waltmann, C.E. Mills, J. Wang, J.M. Torkelson, D. Tullman-Ercek, and M. Olvera de la Cruz, "Functional enzyme-polymer complexes", Proc. Natl. Acad. Sci. U.S.A., 119, 13, e2119509119 (2022). [Link]

2021

Q. Yang, T. Wei, R.T. Yin, M. Wu, Y. Xu, J. Koo, Y.S. Choi, Z. Xie, S.W. Chen, I. Kandela, S. Yao, Y. Deng, R. Avila, T.-L. Liu, W. Bai, Y. Yang, M. Han, Q. Zhang, C.R. Haney, K.B. Lee, K. Aras, T. Wang, M.-H. Seo, H. Luan, S.M. Lee, A. Brikha, N. Ghoreishi-Haack, L. Tran, I. Stepien, F. Aird, E.A. Waters, X. Yu, A. Banks, G.D. Trachiotis, J.M. Torkelson, Y. Huang, Y. Kozorovitskiy, I.R. Efimov, and J.A. Rogers, "Photocurable bioresorbable adhesives as functional interfaces between flexible bioelectronic devices and soft biological tissues", Nature Mater., 20, 155901570 (2021). [Link]

B. Chen and J.M. Torkelson, "Rigid amorphous fraction and crystallinity in cold-crystallized syndiotactic polystyrene: Characterization by differential scanning calorimetry", Polymer, 230, 124044 (2021). [Link]

J. Wang, C. Waltmann, H. Umana-Kossio, M. Olvera de la Cruz, and J.M. Torkelson, "Heterogeneous charged complexes of random copolymers for the segregation of organic molecules", ACS Cent. Sci., 7, 5, 882-891 (2021). [Link]

L. Li, X. Chen, K. Jin, M. Bin Rusayyis, and J.M. Torkelson, "Arresting elevated-temperature creep and achieving full cross-link density recovery in reprocessable polymer networks and network composites via nitroxide-mediated dynamic chemistry", Maromolecules, 54, 3, 1452-1464 (2021). [Link]

M. Mears, Z.J. Zhang, R.C.D. Jackson, Y. Si, T.J.B. Bradford, J.M Torkelson, and M. Geohegan, "Lateral diffusion of single poly(ethylene oxide) chains on the surfaces of glassy and molten polymer films", J. Chem. Phys., 154, 164902 (2021). [Link]

G. Wang, L. Lopez, M. Coile, Y. Chen, J.M. Torkelson, and L. Broadbelt, "Identification of known and novel monomers for poly (hydroxyurethanes) from biobased materials", Ind. Eng. Chem. Res., 60, 18, 6814-6825 (2021). [Link]

M. Bin Rusayyis and J.M. Torkelson, "Reprocessable covalent adaptable networks with excellent elevated-temperature creep resistance: facilitation by dynamic, dissociative bis (hindered amino) disulfide bonds", Polym. Chem., 12, 18, 2760-2771 (2021). [Link]

2020

T. Wei and J.M. Torkelson, "Molecular weight dependence of the glass transition temperature (Tg)-confinement effect in well-dispersed poly(2-vinyl pyridine)-silica nanocomposites: comparison of interfacial layer Tg and matrix Tg", Macromolecules, 53, 19, 8725-8736 (2020). [Link]

M. Bin Rusayyis and J.M. Torkelson, "Recyclable polymethacrylate networks containing dynamic dialkylamino disulfide linkages and exhibiting full property recovery", Maromolecules, 53, 19, 8367-8373 (2020). [Link]

X. Chen, S. Hu, L. Li, and J.M. Torkelson, "Dynamic covalent polyurethane networks with excellent property and cross-link density recovery after recycling and potential for monomer recovery", ACS Appl. Polym. Mater., 2, 5, 2093-2101 (2020). [Link]

L. Li, X. Chen, and J.M. Torkelson, "Covalent adaptive networks for enhanced adhesion: exploiting disulfide dynamic chemistry and annealing during application", ACS Appl. Polym. Mater., 2, 11, 4658-4665 (2020). [Link]

L. Li, Z. Qiang, X. Chen, K. Jin, M. Wang, and J.M. Torkelson, "Impact of bottlebrush chain architecture on Tg-confinement and fragility-confinement effects enabled by thermo-cleavable bottlebrush polymers synthesized by radical coupling and atom transfer radical polymerization", J. Polym. Sci., (2020). [Link]

2019

Z. Qiang, L. Li, J.M. Torkelson, and M. Wang, "Determining order-to-disorder transitions in block copolymer thin films using a self-referencing fluorescent probe", Mol. Syst. Des. Eng., 5, 330-338 (2019). [Link]

C.R. Szczepanski and J.M. Torkelson, "Engineering Surface Hydrophilicity via Polymer Chain-End Segregation in Coatings Formed by Photopolymerization", ACS Appl. Polym. Mater., 1, 3095-3102 (2019).[Link]

L. Li, X. Chen, and J.M. Torkelson, "Reprocessable Polymer Networks via Thiourethane Dynamic Chemistry: Recovery of Cross-link Density after Recycling and Proof-of-Principle Solvolysis Leading to Monomer Recovery", Macromolecules, 52, 8207-8216 (2019). [Link]

X. Chen, L. Li, and J.M. Torkelson, "Recyclable Polymer Networks Containing Hydroxyurethane Dynamic Cross-links: Tuning Morphology, Cross-link Density, and Associated Properties with Chain Extenders", Polymer, 178, 121604 (2019). [Link]

X. Chen, L. Li, T. Wei, and J.M. Torkelson, "Reprocessable Polymer Networks Designed with Hydroxyurethane Dynamic Cross-links: Effect of Backbone Structure on Network Morphology, Phase Segregation and Property Recovery", Macromolecular Chemistry and Physics, 220, 1900083 (2019). [Link]

T. Wei, K. Jin, and J.M. Torkelson, "Isolating the effect of polymer-grafted nanoparticle interactions with matrix polymer from dispersion on composite property enhancement: The example of polypropylene/halloysite nanocomposites", Polymer, 176, 38-50 (2019).[Link]

S. Hu, X. Chen, and J.M. Torkelson, "Biobased Reprocessable Polyhydroxyurethane Networks: Full Recovery of Crosslink Density with Three Concurrent Dynamic Chemistries", ACS Sustainable Chem. Eng., 7, 10025-10034 (2019).[Link]

X. Chen, L. Li, T. Wei, D.C. Venerus, and J.M. Torkelson, "Reprocessable Polyhydroxyurethane Network Composites: Effect of Filler Surface Functionality on Cross-link Density Recovery and Stress Relaxation", ACS Appl. Mater. Interfaces, 11, 2398-2407 (2019).[Link]

2018

Y. Qiu, L.W. Antony, J.M. Torkelson, J.J. de Pablo, and M.D. Ediger, "Tenfold Increase in the Photo Stability of an Azobenzene Guest in Vapor-Deposited Glass Mixtures", J. Chem. Phys., 149, 204503 (2018).[Link]

L. Li, S.R. Marrou, and J.M. Torkelson, "Remarkable Glass Transition Breadths up to 120 K Exhibited by Block-Gradient Copolymers and by Gradient Copolymers Plasticized by Oligomer", Polymer, 151, 145-153 (2018).[Link]

L. Li, X. Chen, K. Jin, and J.M. Torkelson, "Vitrimers Designed Both To Strongly Suppress Creep and To Recover Original Cross-Link Density after Reprocessing: Quantitative Theory and Experiments", Macromolecules, 51, 5537-5546 (2018).[Link]

K. Jin, E.K. Leitsch, X. Chen, W.H. Heath, and J.M. Torkelson, "Segmented Thermoplastic Polymers Synthesized by Thiol-Ene Click Chemistry: Examples of Thiol-Norbornene and Thiol-Maleimide Click Reactions", Macromolecules, 51, 3620-3631 (2018).[Link]

2017

X. Chen, L. Li, K. Jin, and J.M. Torkelson, "Reprocessable Polyhydroxyurethane Network Exhibiting Full Property Recovery and Concurrent Associative and Dissociative Dynamic Chemistry via Transcarbamoylation and Reversible Cyclic Carbonate Aminolysis", Polymer Chemistry, 8, 6349-6355 (2017).[Link]

G. Beniah, W.H. Heath, and J.M. Torkelson, "Functionalization of Hydroxyl Groups in Segmented Polyhydroxyurethane Eliminates Nanophase Separation", Journal of Polymer Science, Part A: Polymer Chemistry, 55, 3347-3351 (2017).[Link]

M. Zhang, S. Askar, J.M. Torkelson, and L.C. Brinson, "Stiffness Gradients in Glassy Polymer Nanocomposites: Comparisons of Quantitative Characterization by Fluorescence Spectroscopy and Atomic Force Microscopy", Macromolecules, 50, 5447-5458 (2017).[Link]

L. Zhang and J.M. Torkelson, "Enhanced Glass Transition Temperature of Low Molecular Weight Poly(methyl methacrylate) by Initiator Fragments Located at Chain Ends", Polymer, 122, 194-199 (2017).[Link]

G. Beniah, D.J. Fortman, W.H. Heath, W.R. Dichtel, and J.M. Torkelson, "Non-Isocyanate Polyurethane Thermoplastic Elastomer: Amide-based Chain Extender Yields Enhanced Nanophase Separation and Properties in Polyhydroxyurethane", Macromolecules, 50, 4425-4434 (2017).[Link]

K. Jin and J.M. Torkelson, "Tg-Confinement Effects in Strongly Miscible Blends of Poly(2,6-dimethyl-1,4,-phenylene oxide) and Polystyrene: Roles of Bulk Fragility and Chain Segregation", Polymer, 118, 85-96 (2017).[Link]

G. Beniah, X. Chen, B.E. Uno, K. Liu, E.K. Leitsch, J. Jeon, W.H. Heath, K.A. Scheidt, and J.M. Torkelson, "Combined Effects of Carbonate and Soft-Segment Molecular Structures on the Nanophase Separation and Properties of Segmented Polyhydroxyurethane", Macromolecules, 50, 3193-3203 (2017).[Link]

L. Zhang and J.M. Torkelson, "Enhancement of Surface Wettability by Incorporating Polar Initiator Fragments at Chain Ends of Low-Molecular-Weight Polymers", ACS Applied Materials & Interfaces, 9, 12176-12181 (2017).[Link]

K. Jin, L. Li, J.M. Torkelson, "Bulk Physical Aging Behavior of Cross-linked Polystyrene Compared to Its Linear Precursor: Effects of Cross-linking and Aging Temperature", Polymer, 115, 197-203 (2017).[Link]

S. Askar, T. Wei, A. W. Tan, and J. M. Torkelson, "Molecular Weight Dependence of the Intrinsic Size Effect on Tg in AAO Template-Supported Polymer Nanorods: A DSC Study", Journal of Chemical Physics, 146, 203323 (2017).[Link]

S. Askar, L. Li, and J.M. Torkelson, "Polystyrene-Grafted Silica Nanoparticles: Investigating the Molecular Weight Dependence of Glass Transition and Fragility Behavior", Macromolecules, 50, 1589-1598 (2017).[Link]

G. Beniah, W.H. Heath, J. Jeon, and J.M. Torkelson, "Tuning the Properties of Segmented Polyhydroxyurethanes via Chain Extender Structure", Journal of Applied Polymer Science, Special Issue: Green and Sustainable Polyurethanes for Advanced Applications, 44942. [Link]

L. Zhang, R. Elupula, S.M. Grayson, and J.M. Torkelson, "Suppression of the Fragility-Confinement Effect via Low Molecular Weight Cyclic or Ring Polymer Topology", Macromolecules, 50, 1147-1154 (2017). [Link]

G. Beniah, B.E. Uno, T. Lan, J. Jeon, W.H. Heath, K.A. Scheidt, and J.M. Torkelson, "Tuning Nanophase Separation Behavior in Segmented Polyhydroxyurethane via Judicious Choice of Soft Segment", Polymer, 110, 218-227 (2017). [Link]

2016

S. Askar and J.M. Torkelson, "Stiffness of Thin, Supported Polystyrene Films: Free-Surface, Substrate, and Confinement Effects Characterized via Self-Referencing Fluorescence," Polymer, 99, 417-426 (2016). [Link]

K. Jin and J.M. Torkelson, "Enhanced Tg-Confinement Effect in Cross-Linked Polystyrene Compared to Its Linear Precursor: Roles of Fragility and Chain Architecture," Macromolecules, 49, 5092-5103 (2016). [Link]

G. Beniah, K. Liu, W.H. Heath, M.D. Miller, K.A. Scheidt, J.M. Torkelson, "Novel Thermoplastic Polyhydroxyurethane Elastomers as Effective Damping Materials over Broad Temperature Ranges," European Polymer Journal, 84, 770-783 (2016). [Link]

K. Jin, W.H. Heath, J.M. Torkelson, "Phase-Separated Thiol-Epoxy-Acrylate Hybrid Polymer Networks with Controlled Cross-link Density Synthesized by Simultaneous Thiol-Acrylate and Thiol-Epoxy Click Reactions," Macromolecules, 49, 4115-4123 (2016). [Link]

K. Jin, L. Li, J.M. Torkelson, "Recyclable Cross-Linked Polymer Networks via One-Step Controlled Radical Polymerization," Advanced Materials, 28, 6746-6750 (2016). [Link]

E.A. Dhulst, W.H. Heath, J.M. Torkelson, "Hybrid Thiol-Acrylate-Epoxy Polymer Networks: Comparison of One-Pot Synthesis with Sequential Reactions and Shape Memory Properties," Polymer, 96, 198-204 (2016). [Link]

E.K. Leitsch, G. Beniah, K. Liu, T. Lan, W.H. Heath, K.A. Scheidt, J.M. Torkelson, "Non-Isocyanate Thermoplastic Polyhydroxyurethane Elastomers via Cyclic Carbonate Aminolysis: Critical Role of Hydroxyl Groups in Controlling Nanophase Separation," ACS Macro Letters, 5, 424-429 (2016). [Link]

L. Zhang, J.A. Marsiglio, T. Lan, J.M. Torkelson, "Dramatic Tunability of the Glass Transition Temperature and Fragility of Low Molecular Weight Polystyrene by Initiator Fragments Located at Chain Ends," Macromolecules, 49, 2387-2398 (2016). [Link]

L. Chen, J.M. Torkelson, "Tuning the Tg-Confinement Effect in Thin Polymer Films via Minute Levels of Residual Surfactant Which "Cap" the Free Surface," Polymer, 87, 226-235 (2016). [Link]

T. Lan, J.M. Torkelson, "Fragility-Confinement Effects: Apparent Universality as a Function of Scaled Thickness in Films of Freely Deposited, Linear Polymer and Its Absence in Densely Grafted Brushes," Macromolecules, 49, 1331-1343 (2016). [Link]

L. Zhang, R. Elupula, S.M. Grayson, J.M. Torkelson, "Major Impact of Cyclic Chain Topology on the Tg-Confinement Effect of Supported Thin Films of Polystyrene," Macromolecules, 49, 257-268 (2016). [Link]

K.A. Iyer, L. Zhang, J.M. Torkelson, "Direct Use of Natural Antioxidant-rich Agro-wastes as Thermal Stabilizer for Polymer: Processing and Recycling," ACS Sustainable Chemistry & Engineering, 4, 881-889 (2016). [Link]

G. Zhang, L. Zhang, H. Gao, I.A. Konstantinov, S.G. Arturo, D. Yu, J.M. Torkelson, L.J. Broadbelt, "A Combined Computational and Experimental Study of Copolymerization Propagation Kinetics for 1-Ethylcyclopentyl Methacrylate and Methyl Methacrylate," Macromolecular Theory and Simulations, 25, 263-273 (2016). [Link]

A.W. Tan, J.M. Torkelson, "Poly(methyl methacrylate) Nanotubes in AAO Templates: Designing Nanotube Thickness and Characterizing the Tg-Confinement Effect by DSC," Polymer, 82, 327-336 (2016). [Link]

K.A. Iyer, J. Lechanski, J.M. Torkelson, "Green Polypropylene/Waste Paper Composite with Superior Modulus and Crystallization Behavior: Optimizing Specific Energy in Solid-State Shear Pulverization for Filler Size Reduction and Dispersion," Composites Part A: Applied Science and Manufacturing, 83, 47-55 (2016). [Link]

E.K. Leitsch, W.H. Heath, J.M. Torkelson, "Polyurethane/Polyhydroxyurethane Hybrid Polymers and Their Applications as Adhesive Bonding Agents," International Journal of Adhesion and Adhesives, 64, 1-8 (2016). [Link]

2015

K. Jin, W.H. Heath, J.M. Torkelson, "Kinetics of Multifunctional Thiol-Epoxy Click Reactions Studied by Differential Scanning Calorimetry: Effects of Catalysis and Functionality," Polymer, 81, 70-78 (2015). [Link]

C.M. Evans, S. Kim, C.B. Roth, R.D. Priestley, L.J. Broadbelt, J.M. Torkelson "Role of Neighboring Domains in Determining the Magnitude and Direction of Tg-Confinement Effects in Binary, Immiscible Polymer Systems," Polymer, 80, 180-187 (2015). [Link]

S. Askar, C.M. Evans, J.M. Torkelson, "Residual Stress Relaxation and Stiffness in Spin-Coated Polymer Films: Characterization by Ellipsometry and Fluorescence," Polymer, 76, 113-122 (2015). [Link]

C.D. Wood, L. Chen, C. Burkhart, K. Putz, J.M. Torkelson, L.C. Brinson, "Measuring Interphase Stiffening Effects in Styrene-Based Polymeric Thin Films," Polymer, 75, 161-167 (2015). [Link]

K.A. Iyer, A.M. Flores, J.M. Torkelson, "Comparison of Polyolefin Biocomposites with Waste Cardboard, Microcrystalline Cellulose, and Cellulose Nanocrystals via Solid-State Shear Pulverization," Polymer, 75, 78-87 (2015). [Link]

K.A. Iyer, J.M. Torkelson, "Importance of Superior Dispersion versus Filler Surface Modification in Producing Robust Polymer Nanocomposites: The Example of Polypropylene/Nanosilica Hybrids," Polymer, 68, 147-157 (2015). [Link]

K. Jin, J.M. Torkelson, "Tg and Tg Breadth of Poly(2,6-dimethyl-1,4-phenylene oxide)/Polystyrene Miscible Polymer Blends Characterized by Differential Scanning Calorimetry, Ellipsometry, and Fluorescence Spectroscopy," Polymer, 65, 233-242 (2015). [Link]

K.A. Iyer, J.M. Torkelson, "Sustainable Green Hybrids of Polyolefins and Lignin Yield Major Improvements in Mechanical Properties When Prepared via Solid-State Shear Pulverization," ACS Sustainable Chemistry & Engineering, 3, 959-968 (2015). [Link]

K.A. Iyer, J.M. Torkelson, "Dispersion and Property Enhancements in Polyolefin/Soy Flour Biocomposites Prepared via Melt Extrusion Followed by Solid-State Shear Pulverization," Macromolecular Materials and Engineering, 300, 772-784 (2015). [Link]

V.M. Lombardo, E.A. Dhulst, E.K. Leitsch, N. Wilmot, W.H. Heath, A.P. Gies, M.D. Miller, J.M. Torkelson, K.A. Scheidt, "Cooperative Catalysis of Cyclic Carbonate Ring Opening: Application Towards Non-Isocyanate Polyurethane Materials," Eur. J. Org. Chem., 2791-2795 (2015). [Link]

L. Zhang, J.M. Torkelson, "Influence of Initiator Fragments as Chain Ends on the Tg-Confinement Effect and Dewetting of Thin Films of Ultralow Molecular Weight Polymer," Polymer, 65, 105-114 (2015). [Link]

T. Lan, J.M. Torkelson, "Substantial Spatial Heterogeneity and Tunability of Glass Transition Temperature Observed with Dense Polymer Brushes Prepared by ARGET ATRP," Polymer, 64, 183-192 (2015). [Link]

M.F. Diop, J.M. Torkelson, "Novel Synthesis of Branched Polypropylene via Solid-State Shear Pulverization," Polymer, 60, 77-87 (2015). [Link]

M.F. Diop, J.M. Torkelson, "Effects of Process Method and Quiescent Coarsening on Dispersed-Phase Size Distribution in Polymer Blends: Comparison of Solid-State Shear Pulverization with Intensive Batch Melt Mixing," Polymer Bulletin, 72, 693-711 (2015). [Link]

K.A. Iyer, G.T. Schueneman, J.M. Torkelson, "Cellulose Nanocrystal/Polyolefin Biocomposites Prepared by Solid-State Shear Pulverization: Superior Dispersion Leading to Synergistic Property Enhancements," Polymer, 56, 464-475 (2015). [Link]

Presentation can be viewed below:

2014

M.F. Diop, W.R. Burghardt, J.M. Torkelson, "Well-mixed Blends of HDPE and Ultrahigh Molecular Weight Polyethylene with Major Improvements in Impact Strength Achieved via Solid-State Shear Pulverization," Polymer, 55, 4948-4958 (2014). [Link]

K.A. Iyer, J.M. Torkelson, "Green Composites of Polypropylene and Eggshell: Effective Biofiller Size Reduction and Dispersion by Single-Step Processing with Solid-State Shear Pulverization," Composites Science and Technology, 102, 152-160 (2014). [Link]

T. Lan, J.M. Torkelson, "Methacrylate-based Polymer Films useful in Lithographic Applications Exhibit Different Glass Transition Temperature-Confinement Effects at High and Low Molecular Weight," Polymer, 55, 1249-1258 (2014). [Link]

2013

M.F. Diop, J.M. Torkelson, "Ester Functionalization of Polypropylene via Controlled Decomposition of Benzoyl Peroxide during Solid-State Shear Pulverization," Macromolecules, 46, 7834-7844 (2013). [Link]

C.M. Evans, H. Deng, W.F. Jager, J.M. Torkelson, "Fragility is a Key Parameter in Determining the Magnitude of Tg-Confinement Effects in Polymer Films," Macromolecules, 46, 6091-6103 (2013). [Link]

M.F. Diop, J.M. Torkelson, "Maleic Anhydride Functionalization of Polypropylene with Suppressed Molecular Weight Reduction via Solid-State Shear Pulverization," Polymer, 54, 4143-4154 (2013). [Link]

C.M. Evans, K.J. Henderson, J.D. Saathoff, K.R. Shull, J.M. Torkelson, "Simultaneous Determination of Critical Micelle Temperature and Micelle Core Glass Transition Temperature of Block Copolymer-Solvent Systems via Pyrene-Label Fluorescence," Macromolecules, 46, 4131-4140 (2013). [Link]

K.A. Iyer, J.M. Torkelson, "Novel, Synergistic Composites of Polypropylene and Rice Husk Ash: Sustainable Resource Hybrids Prepared by Solid-State Shear Pulverization," Polymer Composites, 34, 1211-1221 (2013). [Link]

2012

C.M. Evans, J.M. Torkelson, "Determining Multiple Component Glass Transition Temperatures in Miscible POlymer Blends: Comparison of Fluorescence Spectroscopy and Differential Scanning Calorimetry," Polymer, 53, 6118-6124 (2012). [Link]

C.M. Evans, J.M. Torkelson, "Major Roles of Blend Partner Fragility and Dye Placement on Component Glass Transition Temperatures: Fluorescence Study of Near-Infinitely Dilute Species in Binary Blends," Macromolecules, 45, 8319-8327 (2012). [Link]

P.J. Brunner, J.M. Torkelson, "Overcoming Technological Issues Associated with Color Additives in Rotational Molding via SSSP," Plastics Engineering., 68, 28-34 (2012). [Link]

C.M. Evans, S. Narayanan, Z. Jiang, J.M. Torkelson, "Modulus, Confinement, and Temperature Effects on Surface Capillary Wave Dynamics in Bilayer Polymer Films Near the Glass Transition," Physical Review Letters, 109, 038302 (2012). [Link]

P.J. Brunner, J.T. Clark, J.M. Torkelson, K. Wakabayahsi, "Processing-Structure-Property Relationships in Solid-State Shear Pulverization: Parametric Study of Specific Energy," Polym. Eng. Sci., 52, 1555-1564 (2012). [Link]

L.M.C. Dykes, J.M. Torkelson, W.R. Burghardt, "Shear-Induced Orientation in Well-Exfoliated Polystyrene/Clay Nanocomposites," Macromolecules, in press. [Link]

M.M. Mok, J.M. Torkelson, "Imaging of Phase Segregation in Gradient Copolymers: Island and Hole Surface Topography," J. Polym. Sci. Part B: Polym. Phys., 50, 189-197 (2012). [Link]

2011

C.M. Evans, R.W. Sandoval, J.M. Torkelson, "Glass Transition Temperature of a Component near Infinite Dilution in Binary Polymer Blends: Determination via Fluorescence Spectroscopy," Macromolecules, 44, 6645-6648. [Link]

M.M. Mok, C.J. Ellison, J.M. Torkelson, "Effect of Gradient Sequencing on Copolymer Order-Disorder Transitions: Phase Behavior of Styrene/n-Butyl Acrylate Block and Gradient Copolymers," Macromolecules, 44, 6220-6226. [Link]

S. Kim, J.M. Torkelson, "Distribution of Glass Transition Temperatures in Free-Standing, Nanoconfined Polystyrene Films: A Test of de Gennes' Sliding Motion Mechanism," Macromolecules, 44, 4546-4553. [Link]

2010

L.M.C. Dykes, J.M. Torkelson, W.R. Burghardt, R. Krishnamoorti, "Shear-induced Ordering in Polymer/Clay Dispersions via in situ X-ray Scattering," Polymer, 51, 4916-4927. [Link]

K. Wakabayashi, P.J. Brunner, J. Masuda, S.A. Hewlett, J.M Torkelson, "Polypropylene-graphite nanocomposites made by solid-state shear pulverization: Effects of significantly exfoliated, unmodified graphite content on physical, mechanical and electrical properties," Polymer, 51, 5525-5531. [Link]

M.M. Mok, K.A. Masser, J. Runt, and J.M. Torkelson, "Dielectric Relaxation Spectroscopy of Gradient Copolymers and Block Copolymers: Comparison of Breadths in Relaxation Time for Systems with Increasing Interphase," Macromolecules, 43, 5740-5748 (2010). [Link]

O.C. Compton, S. Kim, C. Pierre, J.M. Torkelson, and S.T. Nguyen, "Crumpled Graphene Nanosheets as Highly Effective Barrier Property Enhancers," Adv. Mater., 22, 4759?763 (2010). [Link]

S. Kim, M.K. Mundra, C.B. Roth, and J.M. Torkelson, "Suppression of the Tg-Nanoconfinement Effect in Thin Poly(vinyl acetate) Films by Sorbed Water," Macromolecules, 43, 5158-5161 (2010). [Link]

P.D. Castrillo, D. Olmos, J.M. Torkelson, and J. Conzalez-Benito, "Kaolin-Epoxy-Based Nanocomposites: A Complementary Study of the Epoxy-Curing by FTIR and Fluorescence," Polym. Composites, 31, 781-791 (2010). [Link]

M.M. Mok, J. Kim, S.R. Marrou, and J.M. Torkelson, "Ellipsometry Measurements of Glass Transition Breadth in Bulk Films of Random, Block, and Gradient Copolymers," Eur. Phys. J. E, 31, 239-252 (2010). [Link]

W. Yuan, M.M. Mok, J. Kim, C.L.H. Wong, C.M. Dettmer, S.T. Nguyen, J.M. Torkelson and K.R. Shull, "Behavior of Gradient Copolymers at Liquid/Liquid Interfaces," Langmuir, 26, 3261-3267 (2010). [Link]

2009

M.M. Mok, J. Kim, C.L.H. Wong, S.R. Marrou, D. Woo, C.M. Dettmer, S.T. Nguyen, C.J. Ellison, K.R. Shull and J.M. Torkelson, "Glass Transition Breadths and Composition Profiles of Weakly, Moderately and Strongly Segregating Gradient Copolymers: Experimental Results and Calculations from Self-Consistent Mean-Field Theory," Macromolecules, 42, 7863-7876 (2009). [Link]

E.A. Baker, P. Rittigstein, J.M. Torkelson, and C.B. Roth, "Streamlined Ellipsometry Procedure for Characterizing Physical Aging Rates of Thin Polymer Films," J. Polym. Sci. Part B: Polym. Phys., 47, 2509-2519 (2009). [Link]

S. Kim, S.A. Hewlett, C.B. Roth, and J.M. Torkelson, "Confinement Effects on Glass Transition Temperature, Transition Breadth, and Expansivity: Comparison of Ellipsometry and Fluorescence Measurements on Polystyrene Films," Eur. Phys. J. E., 30, 83-92 (2009). [Link]

S. Pujari, T. Ramanathan, K. Kasimatis, J. Masuda, R. Andrews, J.M. Torkelson, L.C. Brinson, and W.R. Burghardt, "Preparation and Characterization of Multiwalled Carbon Nanotube Dispersions in Polypropylene: Melt Mixing versus Solid-State Shear Pulverization," J. Polym. Sci. Part B: Polym. Phys., 47, 1426-1436 (2009). [Link]
 

2008

R.W. Sandoval, D.E. Williams, J. Kim, C.B. Roth, and J.M. Torkelson, "Critical Micelle Concentrations of Block and Gradient Copolymers in Homopolymer: Effects of Sequence Distribution, Composition and Molecular Weight," J. Polym. Sci. Part B: Polym. Phys., 46, 2672-2682 (2008). [Link]

S. Kim, C.B. Roth, and J.M. Torkelson, "Effect of Nanoscale Confinement on the Glass Transition Temperature of Free-Standing Polymer Films: Novel, Self-Referencing Fluorescence Method," J. Polym. Sci. Part B: Polym. Phys., 46, 2754-2764 (2008). [Link]

J. Masuda and J.M. Torkelson, "Dispersion and Major Property Enhancement in Polymer/Multiwall Carbon Nanotube Nanocomposites via Solid-State Shear Pulverization Followed by Melt Mixing," Macromolecules, 41, 5974-5977 (2008). [Link]

M.M. Mok, S. Pujari, W.R. Burghardt, C.M. Dettmer, S.T. Nguyen, C.J. Ellison, and J.M. Torkelson, "Microphase Separation and Shear Alignment of Gradient Copolymers: Melt Rheology and Small-Angle X-ray Scattering Analysis," Macromolecules, 41, 5818-5829 (2008). [Link]

J. Kim, R.W. Sandoval, C.M. Dettmer, S.T. Nguyen, and J.M. Torkelson, "Compatibilized Polymer Blends with Nanoscale or Sub-Micron Dispersed Phases Achieved by Hydrogen Bonding Effects: Block Copolymers vs Blocky Gradient Copolymer Addition," Polymer, 49, 2686-2697 (2008). [Link]

M. Mu, A.M. Walker, J.M. Torkelson, and K.I. Winey, "Cellular Structures of Carbon Nanotubes in a Polymer Matrix Improve Properties Relative to Composites with Dispersed Nanotubes," Polymer, 49, 1332-1337 (2008). [Link]

K. Wakabayashi, C. Pierre, D.A. Dikin, R.S. Ruoff, T. Ramanathan, L.C. Brinson, and J.M. Torkelson, "Polymer-Graphite Nanocomposites: Effective Dispersion and Major Property Enhancement via Solid-State Shear Pulverization," Macromolecules 41, 1905-1908 (2008). [Link]

M.M. Mok, J. Kim, and J.M. Torkelson, "Gradient Copolymers with Broad Glass Transition Temperature Regions: Design of Purely Interphase Compositions for Damping Applications," J. Polym. Sci. Part B: Polym. Phys. 46, 48-58 (2008). [Link]
 

2007

R.D. Priestley, M.K. Mundra, N. Barnett, L.J. Broadbelt, and J.M. Torkelson, "Effects of Nanoscale Confinement and Interfaces on the Glass Transition Temperatures of a Series of Poly(n-methacrylate) Films," Australian J. Chem. 60, 765 - 771 (2007). [Link]

C.L.H. Wong, J. Kim, and J.M. Torkelson, "Breadth of Glass Transition Temperature in Styrene/Acrylic Acid Block, Random and Gradient Copolymers: Unusual Sequence Distribution Effects," J. Polym. Sci. Part B: Polym. Phys. 45, 2842 - 2849 (2007). [Link]

C.L.H. Wong, J. Kim, C.B. Roth, and J.M. Torkelson, "Comparison of Critical Micelle Concentrations of Gradient Copolymer and Block Copolymer in Homopolymer: Novel Characterization by Intrinsic Fluorescence," Macromolecules 40, 5631 - 5633 (2007). [Link]

R.D. Priestley, L.J. Broadbelt, J.M. Torkelson, and K. Fukao, "Glass Transition and alpha-Relaxation Dynamics of Thin Films of Labeled Polystyrene," Phys. Rev. E 75, 061806 (2007). [Link]

C.B. Roth and J.M. Torkelson, "Selectively Probing the Glass Transition Temperature in Multilayer Polymer Films: Equivalence of Block Copolymers and Multilayer Films of Different Homopolymers," Macromolecules 40, 3328 - 3336 (2007). [Link]

P. Rittigstein, R.D. Priestley, L.J. Broadbelt, and J.M. Torkelson, "Model Polymer Nanocomposites Provide Understanding of Confinement Effects in Real Nanocomposites," Nature Materials 6, 278 - 282 (2007). [Link]

C.B. Roth, K.L. McNerny, W.F. Jager, and J.M. Torkelson, "Eliminating the Enhanced Mobility at the Free Surface of Polystyrene: Fluorescence Studies of the Glass Transition Temperature in Thin Bilayer Films of Immiscible Polymers," Macromolecules 40, 2568 - 2574 (2007). [Link]

R.D. Priestley, P. Rittigstein, L.J. Broadbelt, K. Fukao, and J.M. Torkelson, "Evidence for the Molecular Scale Origin of the Suppression of Physical Aging in Confined Polymer: Fluorescence and Dielectric Spectroscopy Studies of Polymer-Silica Nanocomposites," J. Phys.: Condens. Matter 19, 205120 (2007). [Link]

M.K. Mundra, S.K. Donthu, V.P. Dravid, and J.M. Torkelson, "Effect of Spatial Confinement on the Glass Transition Temperature of Patterned Polymer Nanostructures," Nano Letters 7, 713-718 (2007). [Link]

A.M. Walker, Y. Tao, and J.M. Torkelson, "Polyethylene/Starch Blends with Enhanced Oxygen Barrier and Mechanical Properties: Effect of Granule Morphology Damage by Solid-State Shear Pulverization," Polymer 48, 1066-1074 (2007). [Link]

M.K. Mundra, C.J. Ellison, P. Rittigstein, and J.M. Torkelson, "Fluorescence Studies of Confinement in Polymer Films and Nanocomposites: Glass Transition Temperature, Plasticizer Effects, and Sensitivity to Stress Relaxation and Local Polarity," Eur. Phys. J. Special Topics 141, 143-151 (2007). [Link]
 

2006

M.K. Mundra, C.J. Ellison, R.E. Behling, and J.M. Torkelson, "Confinement, Composition, and Spin-Coating Effects on the Glass Transition and Stress Relaxation of Thin Films of Polystyrene and Styrene-Containing Random Copolymers: Sensing by Intrinsic Fluorescence," Polymer 47, 7747-7759 (2006). [Link]

P. Rittigstein and J.M. Torkelson, "Polymer-Nanoparticle Interfacial Interactions in Polymer Nanocomposites: Confinement Effects on Glass Transition Temperature and Suppression of Physical Aging," J. Polym. Sci. Part B Polym. Phys. 44, 2935-2943 (2006). [Link]

Y. Tao, J. Kim, and J.M. Torkelson, "Achievement of Quasi-Nanostructured Polymer Blends by Solid-State Shear Pulverization and Compatibilization by Gradient Copolymer Addition," Polymer 47, 6773-6781 (2006). [Link]

J. Kim, M.M. Mok, R.W. Sandoval, D.J. Woo, and J.M. Torkelson, "Uniquely Broad Glass Transition Temperatures of Gradient Copolymers Relative to Random and Block Copolymers Containing Repulsive Comonomers," Macromolecules 39, 6152-6160 (2006). [Link]

J. Kim, H.Y. Zhou, S.T. Nguyen, and J.M. Torkelson, "Synthesis and Application of Styrene/4-Hydroxystyrene Gradient Copolymers Made by Controlled Radical Polymerization: Compatibilization of Immiscible Polymer Blends via Hydrogen Bonding Effects," Polymer 47, 5799-5809 (2006). [Link]

D. Woo, J. Kim, M-H. Suh, H.Y. Zhou, S.T. Nguyen, S.H. Lee, and J.M. Torkelson, "Styrene/4-Hydroxystyrene Random, Block and Gradient Copolymers Modified with an Organic Dye: Synthesis by Controlled Radical Polymerization and Characterization of Electrorheological Properties," Polymer 47, 3287-3291 (2006). [Link]
 

2005

K.L. Brinker, A.H. Lebovitz, J.M. Torkelson, and W.R. Burghardt, "Porod Scattering Study of Coarsening in Immiscible Polymer Blends," J. Polym. Sci. Part B: Polym. Phys. 43, 3413-3420 (2005). [Link]

R.D. Priestley, C.J. Ellison, L.J. Broadbelt, and J.M. Torkelson, "Structural Relaxation of Polymer Glasses at Surfaces, Interfaces and in between," Science 309, 456-459 (2005). [Link]

T.M. Kruse, S.E. Levine, H.-W. Wong, E. Duoss, A.H. Lebovitz, J.M. Torkelson, and L.J. Broadbelt, "Binary Mixture Pyrolysis of Polypropylene and Polystyrene: A Modeling and Experimental Study," J. Anal. Appl. Pyrolysis 73, 342-354 (2005). [Link]

Y. Tao, A.H. Lebovitz, and J.M. Torkelson, "Compatibilizing Effects of Block Copolymer Mixed with Immiscible Polymer Blends by Solid-State Shear Pulverization: Stabilizing the Dispersed Phase to Static Coarsening," Polymer 46, 4753-4761 (2005). [Link]

K.G. Kasimatis, J.A. Nowell, L.M. Dykes, W.R. Burghardt, T. Ramanathan, L.C. Brinson, and J.M. Torkelson, "Polymer Nanocomposites by Pulverization: Enhanced Properties and Dispersion," SPE ANTEC 63, 1965-1969 (2005).

C.J. Ellison, R.D. Priestley, L.J. Broadbelt, M.K. Mundra, P. Rittigstein, and J.M. Torkelson, "On the Glass Transition and Physical Aging in Nanoconfined Polymers," SPE ANTEC 63, 2350-2354 (2005).

Y. Tao, A.H. Lebovitz, and J.M. Torkelson, "Compatibilizing Immiscible Blends with Block Copolymers and Pulverization," SPE ANTEC 63, 2390-2394 (2005).

C.J. Ellison, M.K. Mundra, and J.M. Torkelson, "Impacts of Polystyrene Molecular Weight and Modification to the Repeat Unit Structure on the Glass Transition-Nanoconfinement Effect and the Cooperativity Length Scale," Macromolecules 38, 1767-1778 (2005). [Link]

J. Kim, M.K. Gray, H.Y. Zhou, S.T. Nguyen, and J.M. Torkelson, "Polymer Blend Compatibilization by Gradient Copolymer Addition during Melt Processing: Stabilization of Dispersed Phase to Static Coarsening," Macromolecules 38, 1037-1040 (2005). [Link]

R.D. Priestley, L.J. Broadbelt, and J.M. Torkelson, "Physical Aging of Ultrathin Polymer Films above and below the Bulk Glass Transition Temperature: Effects of Attractive vs Neutral Polymer-Substrate Interactions Measured by Fluorescence," Macromolecules 38, 654-657 (2005). [Link]
 

2004

B.A. Jones and J.M. Torkelson, "Large Melting Point Depression of 2- to 3-nm Length-Scale Nanocrystals Formed by Self-Assembly of an Associative Polymer: Telechelic, Pyrene-labeled Polydimethylsiloxane," J. Polym. Sci. Part B: Polym. Phys. 42, 3470-3475 (2004). [Link]

M.K. Gray, H.Y. Zhou, S.T. Nguyen, and J.M. Torkelson, "Synthesis and Glass Transition Behavior of High Molecular Weight Styrene/4-Acetoxystyrene and Styrene/4-Hydroxystyrene Gradient Copolymers Made via Nitroxide-Mediated Controlled Radical Polymerization," Macromolecules 37, 5586-5595 (2004). [Link]

C.M. Dettmer, M.K. Gray, J.M. Torkelson, and S.T. Nguyen, "Synthesis and Functionalization of ROMP-based Gradient Copolymers of 5-Substituted Norbornenes," Macromolecules 37, 5504-5512 (2004). [Link]

M.K. Gray, H.Y. Zhou, S.T. Nguyen, and J.M. Torkelson, "Differences in Enthalpy Recovery of Gradient and Random Copolymers of Similar Overall Composition: Styrene/4-Methyl Styrene Copolymers Made by Nitroxide-Mediated Controlled Radical Polymerization," Polymer 45, 4777-4786 (2004). [Link]

B.A. Jones and J.M. Torkelson, "Novel Thermoplastic Elastomers Resulting from Gelation of Telechelically Labeled Polydimethylsiloxane," SPE ANTEC 62, 4162-4166 (2004).

A.H. Lebovitz and J.M. Torkelson, "Mixing and Compatibilization of Polymer Blends by Solid-State Shear Pulverization: Effects of Microscopic Composition, Processing Aids, and Pulverization Parameters," SPE ANTEC 62, 2699-2703 (2004).

C.J. Ellison and J.M. Torkelson, "Effects of Free-Surface and Interfacial Layers and Plasticizer Content on the Distribution of Glass Transition Temperatures in Nanoconfined Polymers," SPE ANTEC 62, 2338-2342 (2004).

K.G. Kasimatis and J.M. Torkelson, "Kinetic Stability of the Well-Exfoliated State in Polypropylene-Clay Nanocomposites Made by Solid-State Shear Pulverization," SPE ANTEC 62, 1503-1507 (2004).

B.A. Jones and J.M. Torkelson, "Crystallization and Enthalpy Relaxation of Physically Associating, End-Linked Polymer Networks: Telechelic, Pyrene-Labeled Polydimethylsiloxane," Polym. Bull. 51, 411 (2004).

C.J. Ellison, K.E. Miller, and J.M. Torkelson, "In Situ Monitoring and Drying of Polymer Films and Coatings: Self-Referencing, Nearly Temperature-Independent Fluorescence Sensors," Polymer 45, 2623 (2004). [Link]

C.J. Ellison, R.L. Ruszkowski, N.J. Fredin, and J.M. Torkelson, "Dramatic Reduction of the Effect of Nanoconfinement on the Glass Transition of Polymer Films via Addition of Small-Molecule Diluent", Phys. Rev. Lett. 92, 095702 (2004). [Link]

R.K. Singh, J.O. Stoffer, T.D. Flaim, D.B. Hall, J.M. Torkelson, "Monohydroxy-hydrazone-functionalized Thermally Crosslinked Polymers for Nonlinear Optics," J. Appl. Polym. Sci. 92, 770 (2004). [Link]
 

2003

T.M. Kruse, R. Souleimovova, A. Cho, M.K. Gray, J.M. Torkelson, and L.J. Broadbelt, "Limitations in the Synthesis of High Molecular Weight Polymers via Nitroxide-Mediated Controlled Radical Polymerization: Modeling Studies," Macromolecules 36, 7812 (2003). [Link]

C.J. Ellison and J.M. Torkelson, "The Distribution of Glass Transition Temperatures in Nanoscopically Confined Glass Formers," Nature Materials 2, 695 (2003). [Link]

M.K. Gray, H.Y. Zhou, S.T Nguyen, and J.M. Torkelson, "Limitations in the Synthesis of High Molecular Weight Polymer via Nitroxide-Mediated Controlled Radical Polymerization: Experimental Studies," Macromolecules 36, 5792 (2003). [Link]

A.H. Lebovitz and J.M. Torkelson, "Stability of Dispersed Phase to Static Coarsening: Polymer Blend Compatibilization via Solid-State Shear Pulverization," SPE ANTEC 61, 2328-2332 (2003).

A.H. Lebovitz and J.M. Torkelson, "In Situ Block Copolymer Formation during Solid-State Shear Pulverization: An Explanation for Blend Compatibilization via Interpolymer Radical Coupling Reactions," SPE ANTEC 61, 2323-2327 (2003).

A.H. Lebovitz, M.K. Gray, A.C. Chen, and J.M. Torkelson, "Interpolymer Radical Coupling Reactions during Sonication of Polymer Solutions," Polymer 44, 2823 (2003). [Link]

J.C. Quirin and J.M. Torkelson, "Self-Referencing Fluorescence Sensor for Monitoring Conversion of Non-isothermal Polymerization and Nanoscale Mixing of Resin Components," Polymer 44, 423 (2003). [Link]

A.H. Lebovitz, K. Khait, and J.M. Torkelson, "Submicron Dispersed-Phase Particle Size in Polymer Blends: Overcoming the Taylor Limit via Solid-State Shear Pulverization," Polymer 44, 199 (2003). [Link]
 

2002

C.J. Ellison and J.M. Torkelson, "Sensing the Glass Transition in Thin and Ultrathin Polymer Films via Fluorescence Probes and Labels," J. Polym. Sci. Part B Polym. Phys. 40, 2745 (2002). [Link]

A.H. Lebovitz, K. Khait, and J.M. Torkelson, "In Situ Block Copolymer Formation during Solid-State Shear Pulverization: An Explanation for Blend Compatibilization via Interpolymer Radical Reactions," Macromolecules 35, 9716 (2002). [Link]

A.H. Lebovitz, K. Khait, and J.M. Torkelson, "Stabilization of Dispersed Phase to Static Coarsening: Polymer Blend Compatibilization via Solid-State Shear Pulverization," Macromolecules 35, 8672 (2002). [Link]

M.K. Gray, M.I. Kinsinger, and J.M. Torkelson, "Diffusion-Controlled Polymer-Polymer Reactions in Bulk: Novel Strategy for Model Experiments and Reactive Compatibilization Using Polymers Synthesized via Controlled Radical Polymerization," Macromolecules 35, 8261 (2002). [Link]

B.P. Chekal and J.M. Torkelson, "Relationship between Chain Length and the Concentration Dependence of Polymer and Oligomer Self-Diffusion in Solution," Macromolecules 35, 8126 (2002). [Link]

S.D. Kim and J.M. Torkelson, "Nanoscale Confinement and Temperature Effects on Associative Polymers in Thin Films: Fluorescence Study of a Telechelic, Pyrene-Labeled Poly(dimethylsiloxane)," Macromolecules 35, 5943 (2002). [Link]

C.J. Ellison, S.D. Kim, D.B. Hall, and J.M. Torkelson, "Confinement and Processing Effects on Glass Transition Temperature and Phyiscal Aging in Ultrathin Polymer Films: Novel Fluorescence Measurements," Eur. Phys. J. E 8, 155 (2002). [Link]

K. Khait, E.G. Riddick, and J.M. Torkelson, "Effects of Multiple Processing Cycles on Post-Consumer Plastics Recycled via Solid-State Shear Pulverization," SPE ANTEC 60, 2925-2929 (2002).

M. Ganglani, S.H. Carr, and J.M. Torkelson, "Influence of Cure via Network Structure on Mechanical Properties of a Free-Radical Polymerizing Thermoset," Polymer 43, 2747 (2002). [Link]
 

2001

M. Ganglani, J.M. Torkelson, S.H. Carr, and K.Khait, "Trace Levels of Mechanochemical Effects in Pulverized Polyolefins," J. Appl. Polym. Sci. 80, 671 (2001). [Link]
 

2000

K. Khait and J.M. Torkelson, "A New Polymer Processing Technology for Polymer Blends with Unmatched Viscosity: Solid-State Shear Pulverization," Internat. Polym. Proc. 15, 343 (2000).

N. Furgiuele, A.H. Lebovitz, K. Khait, and J.M. Torkelson, "Efficient Mixing of Polymer Blends of Extreme Viscosity Ratio: Elimination of Phase Inversion via Solid-state Shear Pulverization," Polym. Eng. Sci. 40, 1447 (2000). [Link]

H. Cao, D.B. Hall, J.M. Torkelson, and C.Q. Cao, "Large Enhancement of Second Harmonic Generation in Polymer Films by Microcavities," Appl. Phys. Lett. 76, 538 (2000). [Link]

N. Furgiuele, A.H. Lebovitz, K. Khait, and J.M. Torkelson, "Novel Strategy for Polymer Blend Compatibilization: Solid-State Shear Pulverization," Macromolecules 33, 225 (2000). [Link]
 

1999

D.B. Hall, K.E. Hamilton, R.D. Miller, and J.M. Torkelson, "Translational and Rotational Diffusion of Probe Molecules in Polymer Films near Tg: Effect of Hydrogen Bonding," Macromolecules 32, 8052 (1999). [Link]

J.C. Hooker, W.R. Burghardt, and J.M. Torkelson, "Birefringence and Second-order Nonlinear Optics as Probes of Polymer Cooperative Segmental Mobility: Demonstration of Debye-type Relaxation," J. Chem Phys. 111, 2779-2788 (1999). [Link]

K.Khait and J.M. Torkelson, "Solid-State Shear Pulverization of Plastics: A Green Recycling Process," Polym.-Plast. Tech. Eng. 38, 445-457 (1999).

G.A. O'Neil and J.M Torkelson, "Modeling Insight into the Diffusion-Limited Cause of the Gel Effect in Free Radical Polymerization," Macromolecules 32, 411 (1999). [Link]
 

1998

D.B. Hall and J.M. Torkelson, "Small Molecule Probe Diffusion in Thin and Ultrathin Supported Polymer Films," Macromolecules 31, 8817 (1998). [Link]

D.B. Hall, P.Underhill, and J.M.Torkelson, "Spin Coating of Thin and Ultrathin Polymer Films," Polym. Eng. Sci. 39, 2039 (1998). [Link]

D.B. Hall, D.D. Deppe, K.E. Hamilton, A. Dhinojwala, and J.M. Torkelson, "Probe Translational and Rotational Diffusion in Polymers near Tg: Roles of Probe Size, Shape, and Secondary Bonding in Deviations from Debye-Stokes-Einstein Scaling," J. Non-Cryst. Solids 235, 48 (1998). [Link]

G.A. O'Neil, M.B. Wisnudel, and J.M. Torkelson, "An Evaluation of Free Volume Approaches to Describe the Gel Effect in Free Radical Polymerization," Macromolecules 31, 4537 (1998). [Link]

G.A. O'Neil, M.B. Wisnudel, and J.M. Torkelson, "Gel Effect in Free Radical Polymerization: Model Discrimination of Its Cause," AIChE J. 44, 1226 (1998). [Link]
 

1997

D.B. Hall, R.D. Miller, and J.M. Torkelson, "Molecular Probe Techniques for Studying Diffusion and Relaxation in Thin and Ultrathin Polymer Films", J. Polym. Sci.: Polym. Phys. Ed. 35, 2795 (1997). [Link]

G.A. O'Neil and J.M. Torkelson, "Recent Advances in Understanding the Gel Effect in Free Radical Polymerization," Trends Polym. Sci. 5, 349 (1997).

G.A. O'Neil and J.M. Torkelson, "On the Proper Use of Concentration Profiles for Determining Polymer Diffusion Coefficients via Fluorescence Nonradiative Energy Transfer," Macromolecules 30, 5560 (1997). [Link]

G.A. O'Neil and J.M. Torkelson, "On the Importance of Including Intermolecular Correlations in the Measurement of Polymer Interdiffusion by Fluorescence Nonradiative Energy Transfer," Macromol. Theory Simul. 6, 931 (1997). [Link]

D.B. Hall, A. Dhinojwala, and J.M. Torkelson, "Translation-Rotation Paradox for Diffusion in Glass-Forming Polymers: The Role of the Temperature Dependence of the Relaxation Time Distribution," Phys. Rev. Lett. 79, 103 (1997). [Link]

C.K. Haas and J.M. Torkelson, "Two-dimensional Coarsening and Phase Separation in Thin Polymer Solution Films," Phys. Rev. E 55, 3191 (1997). [Link]

D.B. Hall, J.C. Hooker, and J.M. Torkelson, "Ultrathin Polymer Films near the Glass Transition: Effect on the Distribution of alpha-Relaxation Times As Measured by Second Harmonic Generation," Macromolecules 30, 667 (1997). [Link]
 

1996

S.L. Tracy, J.M. Torkelson, and H.M. Jennings, "Preliminary Investigations into Organic-Inorganic Composite Formation: The System DDAB-H2O-MMA-CaSO4," Mater. Sci. Eng. C 4, 149 (1996). [Link]

M.B. Wisnudel and J.M. Torkelson, "Effect of Chain Length on Rates of Diffusion-Limited Small Molecule-Polymer and Polymer-Polymer Reactions: Phosphorescence Quenching Studies," J. Polym. Sci.: Polym. Phys. Ed. 34, 2999 (1996). [Link]

D.D. Deppe, R.D. Miller, and J.M. Torkelson, "Small Molecule Diffusion in a Rubbery Polymer near Tg: Effects of Probe Size, Shape, and Flexibility," J. Polym. Sci.: Polym. Phys. Ed. 34, 2987 (1996). [Link]

G.A. O'Neil, M.B. Wisnudel, and J.M. Torkelson, "A Critical Experimental Examination of the Gel Effect in Free Radical Polymerization: Do Entanglements Cause Autoacceleration?" Macromolecules 29, 7477 (1996). [Link]

M.B. Wisnudel and J.M. Torkelson, "Small-Molecule Probe Diffusion in Polymer Solutions: Studies by Taylor Dispersion and Phosphorescence Quenching," Macromolecules 29, 6193 (1996). [Link]

D.D. Deppe and J.M. Torkelson, "Diffusional Dynamics near the Glass Transition in Amorphous Polymer Thin Films," Mater. Res. Soc. Proc. 407, 221 (1996).

D.D. Deppe, A. Dhinojwala, and J.M. Torkelson, "Small-Molecule Probe Diffusion in Thin Polymer Films near the Glass Transition: A Novel Approach Using Fluorescence Nonradiative Energy Transfer," Macromolecules 29, 3898 (1996). [Link]

M. B. Wisnudel and J.M. Torkelson, "Use of Taylor Dispersion for the Measurement of Probe Diffusion in Polymer Solutions," AIChE J. 42, 1157 (1996). [Link]
 

1995

S.-W. Song and J. M. Torkelson, "Phase Separation Phenomena in Polystyrene Solutions," Korea Polym. J. 3, 86 (1995).

S.-W. Song and J.M. Torkelson, "Microporous Polystyrene Membranes Produced via Thermally Induced Phase Separation," Memburein 5, 119 (1995).

K.E. Miller, R. H. Krueger, and J.M. Torkelson, "Mobility-Sensitive Fluorescence Probes for Quantitative Monitoring of Water Sorption and Diffusion in Polymer Coatings," J. Polym. Sci.: Polym. Phys. Ed. 33, 2343 (1995). [Link]

J.C. Hooker and J.M. Torkelson, "Coupling of Probe Reorientation Dynamics and Rotor Motions to Polymer Relaxation as Sensed by Second Harmonic Generation and Fluorescence," Macromolecules 28, 7683 (1995). [Link]

C.K. Haas and J.M. Torkelson, "2D Coarsening in Phase Separated Polymer Solutions: Dependence on Distance from Criticality," Phys. Rev. Lett. 75, 3134 (1995). [Link]

A. Dhinojwala, J.C. Hooker, and J.M. Torkelson, "Quantitative, Rational Predictions of the Long-Term Temporal Decay Properties of Second-Order Nonlinear Optical Polymers from the Analysis of Relaxation Dynamics," ACS Symp. Ser. 601, 318 (1995).

S.-W. Song and J.M. Torkelson, "Coarsening Effects on the Formation of Microporous Membranes Produced via Thermally Induced Phase Separation of Polystyrene-Cyclohexanol Solutions," J. Membrane Sci. 98, 209 (1995). [Link]
 

1994

K.E. Miller, E.L. Burch, F.D. Lewis, and J.M. Torkelson, "In Situ Monitoring of Free-Radical Polymerization by Fluorescence Quenching of Fluorene and Reactive Derivatives," J. Polym. Sci.: Polym. Phys. Ed. 32, 2625 (1994). [Link]

A.S. Mendelsohn, J.M. Torkelson, and M. Olvera de la Cruz, "Fluorescence Nonradiative Energy Transfer in Bulk Polymer and Miscible and Phase-Separated Polymer Blends: A Quantitative Analysis Including Correlation Effects," J. Polym. Sci.: Polym. Phys. Ed. 32, 2667 (1994). [Link]

M.B. Wisnudel and J.M. Torkelson, "Diffusion-Limited Photophysical Interactions as in Situ Probes of Conversion in Free Radical Polymerization: Quantitative Analysis with Predictive Free-Volume Theory," Macromolecules 27, 7217 (1994). [Link]

S.-W. Song and J.M. Torkelson, "Coarsening Effects on Microstructure Formation in Isopycnic Polymer Solutions and Membranes Produced via Thermally Induced Phase Separation," Macromolecules 27, 6389 (1994). [Link]

A. Dhinojwala, J.C. Hooker, and J.M. Torkelson, "Retardation of Rotational Reorientation Dynamics in Polymers near the Glass Transition: A Novel Study over Eleven Decades in Time Using Second-Order Nonlinear Optics," J. Non-Cryst. Solids 172-174, 286 (1994). [Link]

A. Dhinojwala, G.K. Wong, and J.M. Torkelson, "Relative Contribution of the Electric-Field-Induced Third-Order Effect to Second Harmonic Generation in Poled, Doped, Amorphous Polymers," J. Opt. Soc. Am. B 11, 1549 (1994).

A. Dhinojwala and J.M. Torkelson, "A Reconsideration of the Measurement of Polymer Interdiffusion by Fluorescence Nonradiative Energy Transfer," Macromolecules 27, 4817 (1994). [Link]

A. Dhinojwala, G.K. Wong, and J.M. Torkelson, "Rotational Reorientation Dynamics of Disperse Red 1 in Polystyrene: a-Relaxation Dynamics Probed by Second Harmonic Generation and Dielectric Relaxation," J. Chem. Phys. 100, 6046 (1994). [Link]
 

1993

A.S. Mendelsohn, M. Olvera de la Cruz, and J.M. Torkelson, "Correlations in Polymer Melts and Solutions as Investigated by Fluorescence Nonradiative Energy Transfer: A Novel Comparison of Theory to Experiment by Fluorescence Intensity Decay Measurements," Macromolecules 26, 6789 (1993). [Link]

A. Dhinojwala, G.K. Wong, and J.M. Torkelson, "Rotational Reorientation Dynamics of Nonlinear Optical Chromophores in Rubbery and Glassy Polymers: a-Relaxation Dynamics Probed by Second Harmonic Generation and Dielectric Relaxation," Macromolecules 26, 5943 (1993). [Link]

J.S. Royal and J.M. Torkelson, "Physical Aging Effects on Molecular-Scale Polymer Relaxations Monitored with Mobility-Sensitive Fluorescent Molecules," Macromolecules 26, 5331 (1993). [Link]
 

1992

A. Dhinojwala, G.K. Wong, and J.M. Torkelson, "A Quantitative Analysis of Rotational Dynamics in Doped Polymers above and below the Glass Transition Temperature: A Novel Application of Second-Order Nonlinear Optics," Macromolecules 25, 7395 (1992). [Link]

J.S. Royal and J.M. Torkelson, "Photochromic and Fluorescent Probe Studies in Glassy Polymer Matrices. 5. Effects of Physical Aging on Bisphenol-A Polycarbonate and Poly(vinyl acetate) as Sensed by a Size Distribution of Photochromic Probes," Macromolecules 25, 4792 (1992). [Link]

M.S. Gebert, D.H.-S. Yu, and J.M. Torkelson, " Diffusion-Limited Polymer-Small Molecule Interactions: A Study by Phosphorescence Quenching," Macromolecules 25, 4160 (1992). [Link]

J.S. Royal and J.M. Torkelson, "Molecular-Scale Asymmetry and Memory Behavior in Poly(vinyl acetate) Monitored with Mobility-Sensitive Probes," Macromolecules 25, 1705 (1992). [Link]

T.M. Bohanon, J.M. Mikrut, B.M. Abraham, J.B. Ketterson, S. Jacobsen, L. Flosenzier, J.M. Torkelson, and P. Dutta, "An Apparatus with an Elastic Barrier for Radial Compression of Liquid Supported Monolayers," Rev. Sci. Instrum. 63, 1822 (1992). [Link]

L.S. Flosenzier and J.M. Torkelson, "The Influence of Molecular Weight and Composition on the Mechanical Properties and Morphology of SBS-Polystyrene-Mineral Oil Blends," Macromolecules 25, 735 (1992). [Link]

J.S. Royal, J.G. Victor, and J.M. Torkelson, "Photochromic and Fluorescent Probe Studies in Glassy Polymer Matrices. 4. Effects of Physical Aging in Poly(methyl methacrylate) as Sensed by a Size Distribution of Photochromic Probes," Macromolecules 25, 729 (1992). [Link]

S. Shen and J.M. Torkelson, "Miscibility and Phase Separation in Poly(methyl methacrylate)/ Poly(vinyl chloride) Blends: Study of Thermodynamics by Thermal Analysis," Macromolecules 25, 721 (1992). [Link]
 

1991

H.L. Hampsch, J. Yang, G.K. Wong, and J.M. Torkelson, "Thermal Effects on Dopant Orientation in Poled, Doped Polymers Using Second Harmonic Generation," ACS Symp. Ser. 455, 294 (1991).
 

1990

F.-J. Tsai and J.M. Torkelson, "Microporous Poly(methyl methacrylate) Membranes: Effect of a Low Viscosity Solvent on the Formation Mechanism," Macromolecules 23, 4983 (1990). [Link]

H.L. Hampsch, J. Yang, G.K. Wong, and J.M. Torkelson, "Second Order Nonlinear Optics and Polymer Physics of Corona Poled, Doped Polymer Materials," MRS Symp. Ser. 173, 625 (1990).

S. Shen, J.M. Torkelson, J.E. Elbert, and F.D. Lewis, "Thermally Irreversible Photoresponsive Polymers: Synthesis and Preliminary Characterization of Copolymers Containing Side-Chain trans-Cinnamamide Chromophores," Makromol. Chem. 191, 2367 (1990). [Link]

M.S. Gebert and J.M. Torkelson, "Synthesis, Characterization and Photophysical Properties of Benzil-Labeled Polymers for Studies of Diffusion-Limited Interaction by Phosphorescence Quenching," Polymer 31, 2402 (1990). [Link]

L.S. Flosenzier, J.H. Rohlfing, A.M. Schwark, and J.M. Torkelson,"The Effects of Blending Small Amounts of Homopolystyrene on the Mechanical Properties of a Low Styrene Content Styrene-Butadiene-Styrene Block Copolymer - Corrections," Polym. Eng. Sci. 30, 1180 (1990). [Link]

H.L. Hampsch, J. Yang, G.K. Wong, and J.M. Torkelson, "Dopant Orientation Dynamics in Doped Second Order Nonlinear Optical Amorphous Polymers. 2. Effects of Physical Aging in Corona Poled Films," Macromolecules 23, 3648 (1990). [Link]

H.L. Hampsch, J. Yang, G.K. Wong, and J.M. Torkelson, "Dopant Orientation Dynamics in Doped Second Order Nonlinear Optical Amorphous Polymers. 1. Effects of Temperature above and below Tg in Corona Poled Films," Macromolecules 23, 3640 (1990). [Link]

J.S. Royal and J.M. Torkelson, "Monitoring the Molecular Scale Effects of Physical Aging in Polymer Glasses with Fluorescence Probes," Macromolecules 23, 3536 (1990). [Link]

L.L. Spangler, J.M. Torkelson, and J.S. Royal, "Influence of Solvent and Molecular Weight on Thickness and Surface Topography of Spin-Coated Polymer Films," Polym. Eng. Sci. 30, 644 (1990). [Link]

M.D. Major, J.M. Torkelson, and A.M. Brearley, "Fluorescence Energy Transfer Studies of Bulk Styrene-Isoprene Diblock Copolymers and Their Blends with Polyisoprene: Applications to Microphase Separation," Macromolecules 23, 1711 (1990). [Link]

M.D. Major, J.M. Torkelson, and A.M. Brearley, "Fluorescence Energy Transfer Studies of Styrene-Isoprene Diblock Copolymer Solutions," Macromolecules 23, 1700 (1990). [Link]

F.-J. Tsai, J.M. Torkelson, F.D. Lewis and B. Holman, "Photoresponsive Behavior of Methyl Methacrylate/trans-4-Stilbene Methacrylate Statistical Copolymers in Solution and the Solid State," Macromolecules 23, 1487 (1990). [Link]

F.-J. Tsai and J.M. Torkelson, "The Roles of Phase Separation Mechanism and Coarsening in the Formation of Polymethylmethacrylate Asymmetric Membranes," Macromolecules 23, 775 (1990). [Link]

H.L. Hampsch, J.M. Torkelson, S.J. Bethke, and S.G. Grubb, "Second Harmonic Generation in Corona Poled, Doped Polymer Films as a Function of Corona Processing," J. Appl. Phys. 67, 1037 (1990). [Link]

L.S. Flosenzier, J.H. Rohlfing, A.M. Schwark, and J.M. Torkelson, "The Effects of Blending Small Amounts of Homopolystyrene on the Mechanical Properties of a Low Styrene Content Styrene-Butadiene-Styrene Block Copolymer," Polym. Eng. Sci. 30, 49 (1990). [Link]
 

1989

H.L. Hampsch, J. Yang, G.K. Wong, and J.M. Torkelson, "Second Harmonic Generation in Glassy Polymer Films as a Function of Physical Aging and Dopant Size," Polymer Commun. 30, 40 (1989).

F.-J. Tsai and J.M. Torkelson, "On Studying Asymmetric Membranes Made from Polymethylmethacrylate/Xylene by the Thermal-Inversion Method," Prog. Clin. Biol. Res. 292, 119 (1989).
 

1988

P.N. Georgelos and J.M. Torkelson, "Apparent Thickening Behavior in Dilute Polystyrene Solutions in Extensional Flows," Rheol. Acta 27, 369 (1988). [Link]

J.G. Victor and J.M. Torkelson, "Photochromic and Fluorescent Probe Studies in Glassy Polymer Matrices. 3. Effects of Physical Aging and Molar Weight on the Size Distribution of Local Free Volume in Polystyrene," Macromolecules 21, 3490 (1988). [Link]

F.-J. H. Tsai and J.M. Torkelson, " On Measuring the Concentration Dependence of Excimer Fluorescence in Polystyrene Solutions," Polymer 29, 1004 (1988). [Link]

D.H.-S. Yu and J.M. Torkelson, "Diffusion-Limited Phosphorescence Quenching Interactions in Polymer Solutions: Small Molecule-Small Molecule Interactions Interpreted by Free Volume Theory," Macromolecules 21, 1033 (1988). [Link]

F.-J. Tsai and J.M. Torkelson, "Phase Separation of Oligomeric Polystyrene-Polybutadiene Blends as Studied by Excimer Fluorescence," Macromolecules 21, 1026 (1988). [Link]

P.N. Georgelos and J.M. Torkelson, "The Role of Solution Structure in Apparent Thickening Behavior of 'Dilute' PEO/Water Systems," J. Non-Newt. Fluid Mech. 27, 191 (1988). [Link]

H.-S. Yu and J. M. Torkelson, "Phosphorescence Quenching of Benzil by Polystyrene in Dilute and Semi-Dilute Solutions," Macromolecules 21, 852 (1988). [Link]

H.L. Hampsch, J. Yang, G.K. Wong, and J.M. Torkelson, "Orientation and Second Harmonic Generation in Doped Polystyrene and Polymethylmethacrylate Films," Macromolecules 21, 526 (1988). [Link]
 

1987

W.H. Schwimmer and J.M. Torkelson, "A Study of Interpenetration Using Fluorescence Quenching of Chromophore Labelled Polymers," Polymer 28, 2257 (1987). [Link]

J.G. Victor and J.M. Torkelson, "Photochromic and Fluorescence Probe Studies in Glassy Polymer Matrices. 2. Isomerizable Planar Probe Molecules Lacking an Inversion Center of Symmetry," Macromolecules 20, 2951 (1987). [Link]

J.G. Victor and J.M. Torkelson, "On Measuring the Distribution of Local Free Volume in Glassy Polymers by Photochromic and Photophysical Techniques," Macromolecules 20, 2241 (1987). [Link]

J.M. Torkelson and S.R. Gilbert, "Determination of Interpenetration of Polystyrene in Solution and Film by Energy Transfer Techniques," Macromolecules 20, 1860 (1987). [Link]
 

1986

M.D. Major and J.M. Torkelson, "Fluorescence of Vinyl Aromatic Polyelectrolytes: Effects of Conformation, Concentration, and Molecular Weight of Sodium Poly(styrene sulfonate)," Macromolecules 20, 2801 (1986). [Link]
 

1984

J.M. Torkelson, M. Tirrell, and C.W. Frank, "Polystyrene-Methylcyclohexane Solutions Undergoing Phase Separation: A Study by Fluorescence Spectroscopy," Macromolecules 17, 1505 (1984). [Link]
 

1983

J.M. Torkelson, S. Lipsky, M. Tirrell, and D.A. Tirrell, "Fluorescence and Absorbance of Polystyrene in Dilute and Semi-dilute Solutions," Macromolecules 16, 326 (1983). [Link]
 

1981

J.M. Torkelson, S. Lipsky, and M. Tirrell, "Polystyrene Fluorescence: Effects of Molecular Weight in Various Solvents," Macromolecules 14, 1601 (1981). [Link]
 

1979

M. Tirrell and J.M. Torkelson, "Approaches to the Modelling of the Hydrodynamic Properties of Rigid Biomacromolecules: Some Quantitative Comparisons," J. Rheol. 23, 751 (1979). [Link]
 

1977