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Research Output

2011

Non-contact measurements of "Stiffness" in confined polymer films by fluorescence and x-ray photon correlation spectroscopy

Evans, C. M., Narayanan, S., Jiang, Z. & Torkelson, J. M., Jan 1 2011, Materials Engineering and Sciences Division - Core Programming Topic at the 2011 AIChE Annual Meeting. AIChE, p. 648-649 2 p. (Materials Engineering and Sciences Division - Core Programming Topic at the 2011 AIChE Annual Meeting; vol. 2).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Orders of magnitude decrease in dye diffusion in nanoconfined polymer films: Fluorescence nonradiative energy transfer technique

Deng, H., Mundra, M. K. & Torkelson, J. M., Jan 1 2011, Materials Engineering and Sciences Division - Core Programming Topic at the 2011 AIChE Annual Meeting. AIChE, p. 865-866 2 p. (Materials Engineering and Sciences Division - Core Programming Topic at the 2011 AIChE Annual Meeting; vol. 2).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Orders of magnitude decrease in dye diffusion in nanoconfined polymer films: Fluorescence nonradiative energy transfer technique

Deng, H., Mundra, M. K. & Torkelson, J. M., Jan 1 2011, Separations Division - Core Programming Topic at the 2011 AIChE Annual Meeting. AIChE, Vol. 1. p. 421-422 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polymer-Graphite Nanocomposites Via Solid-State Shear Pulverization

Torkelson, J., Mar 15 2011, Patent No. 7906053

Research output: Patent

2010

Behavior of gradient copolymers at liquid/liquid interfaces

Yuan, W., Mok, M. M., Kim, J., Wong, C. L. H., Dettmer, C. M., Nguyen, S., Torkelson, J. M. & Shull, K. R., Mar 2 2010, In : Langmuir. 26, 5, p. 3261-3267 7 p.

Research output: Contribution to journalArticle

22 Scopus citations

Crumpled graphene nanosheets as highly effective barrier property enhancers

Compton, O. C., Kim, S., Pierre, C., Torkelson, J. M. & Nguyen, S. T., Nov 9 2010, In : Advanced Materials. 22, 42, p. 4759-4763 5 p.

Research output: Contribution to journalArticle

332 Scopus citations

Dielectric relaxation spectroscopy of gradient copolymers and block copolymers: Comparison of breadths in relaxation time for systems with increasing interphase

Mok, M. M., Masser, K. A., Runt, J. & Torkelson, J. M., Jul 13 2010, In : Macromolecules. 43, 13, p. 5740-5748 9 p.

Research output: Contribution to journalArticle

27 Scopus citations

Ellipsometry measurements of glass transition breadth in bulk films of random, block, and gradient copolymers

Mok, M. M., Kim, J., Marrou, S. R. & Torkelson, J. M., Mar 1 2010, In : European Physical Journal E. 31, 3, p. 239-252 14 p.

Research output: Contribution to journalArticle

20 Scopus citations

Kaolin-Epoxy-Based nanocomposites: A complementary study of the epoxy curing by FTIR and fluorescence

Castrillo, P. D., Olmos, D., Torkelson, J. M. & González-Benito, J., May 2010, In : Polymer Composites. 31, 5, p. 781-791 11 p.

Research output: Contribution to journalArticle

7 Scopus citations

Nanostructure control for tuning the glass transition temperature of polystyrene by 100 K: Blends and multilayer films

Kim, S., Roth, C. B., Priestley, R. D., Sandoval, R. W., Mok, M. M. & Torkelson, J. M., Sep 22 2010, 68th Annual Technical Conference of the Society of Plastics Engineers 2010, ANTEC 2010. Vol. 1. p. 58-64 7 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polypropylene-graphite nanocomposites made by solid-state shear pulverization: Effects of significantly exfoliated, unmodified graphite content on physical, mechanical and electrical properties

Wakabayashi, K., Brunner, P. J., Masuda, J., Hewlett, S. A. & Torkelson, J. M., Oct 29 2010, In : Polymer. 51, 23, p. 5525-5531 7 p.

Research output: Contribution to journalArticle

92 Scopus citations

Shear-induced orientation in polymer/clay dispersions via in situ X-ray scattering

Dykes, L. M. C., Torkelson, J. M., Burghardt, W. R. & Krishnamoorti, R., Oct 2010, In : Polymer. 51, 21, p. 4916-4927 12 p.

Research output: Contribution to journalArticle

30 Scopus citations

Solving problems with biobased, sustainable PLA and recyclability of PET for high-value applications via solid-state shear pulverization

Torkelson, J. M., Brunner, P. J., Pierre, C., Millard-Swan, A. & Pukala, K., Sep 23 2010, 68th Annual Technical Conference of the Society of Plastics Engineers 2010, ANTEC 2010. Vol. 2. p. 1481-1485 5 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Suppression of the t g-nanoconfinement effect in thin poly(vinyl acetate) films by sorbed water

Kim, S., Mundra, M. K., Roth, C. B. & Torkelson, J. M., Jun 8 2010, In : Macromolecules. 43, 11, p. 5158-5161 4 p.

Research output: Contribution to journalArticle

47 Scopus citations
2009
103 Scopus citations

Effects of confinement on the Tg of free-standing polymer films: Novel fluorescence studies

Kim, S., Roth, C. B. & Torkelson, J. M., Nov 25 2009, 67th Annual Technical Conference of the Society of Plastics Engineers 2009, ANTEC 2009. Vol. 3. p. 1845-1849 5 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Effects of free surface and substrate interactions on the distribution of glass transition temperatures in nanoconfined polymers

Deng, H. & Torkelson, J. M., 2009, 67th Annual Technical Conference of the Society of Plastics Engineers 2009, ANTEC 2009. p. 801-804 4 p. (Annual Technical Conference - ANTEC, Conference Proceedings; vol. 2).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Glass transition breadths and composition profiles of weakly, moderately, and strongly segregating gradient copolymers: experimental results and calculations from self-consistent mean-field theory

Mok, M. M., Kim, J., Wong, C. L. H., Marrou, S. R., Woo, D. J., Dettmer, C. M., Nguyen, S. T., Ellison, C. J., Shull, K. R. & Torkelson, J. M., Oct 27 2009, In : Macromolecules. 42, 20, p. 7863-7876 14 p.

Research output: Contribution to journalArticle

71 Scopus citations

In situ production of slightly branched poly(ethylene terephthalate) by solid-state shear pulverization: A potential solution to improved recyclability and sustainability

Pierre, C. & Torkelson, J. M., Nov 25 2009, 67th Annual Technical Conference of the Society of Plastics Engineers 2009, ANTEC 2009. p. 629-632 4 p. (Annual Technical Conference - ANTEC, Conference Proceedings; vol. 2).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Melt rheology and x-ray analysis of gradient copolymers: Sequence design for processibility

Mok, M. M., Kim, S., Burghardt, W. R., Torkelson, J. M. & Ellison, C. J., Nov 25 2009, 67th Annual Technical Conference of the Society of Plastics Engineers 2009, ANTEC 2009. Vol. 2. p. 649-653 5 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polymer-graphite and polymer-carbon nanotube nanocomposites: processing via solid-state shear pulverization

Mausda, J., Wakabayashi, K., Brunner, P. J. & Torkelson, J. M., Nov 25 2009, 67th Annual Technical Conference of the Society of Plastics Engineers 2009, ANTEC 2009. p. 547-551 5 p. (Annual Technical Conference - ANTEC, Conference Proceedings; vol. 1).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Preparation and characterization of multiwalled carbon nanotube dispersions in polypropylene: Melt mixing versus solid-state shear pulverization

Pujari, S., Ramanathan, T., Kasimatis, K., Masuda, J., Andrews, R., Torkelson, J. M., Brinson, L. C. & Burghardt, W. R., Jul 15 2009, In : Journal of Polymer Science, Part B: Polymer Physics. 47, 14, p. 1426-1436 11 p.

Research output: Contribution to journalArticle

35 Scopus citations

Streamlined ellipsometry procedure for characterizing physical aging rates of thin polymer films

Baker, E. A., Rittigstein, P., Torkelson, J. M. & Roth, C. B., Dec 15 2009, In : Journal of Polymer Science, Part B: Polymer Physics. 47, 24, p. 2509-2519 11 p.

Research output: Contribution to journalArticle

42 Scopus citations

Why gradient copolymers make better compatibilizers of immiscible polymer blends than block copolymers: Determining critical micelle concentrations of copolymer in homopolymer

Sandoval, R. W., Williams, D. E., Doroudian, G., Wong, C. L. H., Kim, J., Roth, C. B. & Torkelson, J. M., Nov 25 2009, 67th Annual Technical Conference of the Society of Plastics Engineers 2009, ANTEC 2009. Vol. 5. p. 2651-2656 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2008

A comparison of structures and property enhancements associated with poly(ethylene terephthalate) nanocomposites made with clay or graphite by solid-state shear pulverization

Pierre, C., Qu, W. & Torkelson, J. M., Dec 1 2008, AIChE100 - 2008 AIChE Annual Meeting, Conference Proceedings.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Cellular structures of carbon nanotubes in a polymer matrix improve properties relative to composites with dispersed nanotubes

Mu, M., Walker, A. M., Torkelson, J. M. & Winey, K. I., Mar 3 2008, In : Polymer. 49, 5, p. 1332-1337 6 p.

Research output: Contribution to journalArticle

84 Scopus citations

Compatibilized polymer blends with nanoscale or sub-micron dispersed phases achieved by hydrogen-bonding effects: Block copolymer vs blocky gradient copolymer addition

Kim, J., Sandoval, R. W., Dettmer, C. M., Nguyen, S. & Torkelson, J. M., May 27 2008, In : Polymer. 49, 11, p. 2686-2697 12 p.

Research output: Contribution to journalArticle

48 Scopus citations

Critical micelle concentrations of block and gradient copolymers in homopolymer: Effects of sequence distribution, composition, and molecular weight

Sandoval, R. W., Williams, D. E., Kim, J., Roth, C. B. & Torkelson, J. M., Dec 15 2008, In : Journal of Polymer Science, Part B: Polymer Physics. 46, 24, p. 2672-2682 11 p.

Research output: Contribution to journalArticle

28 Scopus citations

Design of gradient copolymers for damping applications over uniquely broad temperature ranges

Mok, M. M., Kim, J. & Torkelson, J. M., Sep 29 2008, Society of Plastics Engineers - 66th Annual Technical Conference of the Society of Plastics Engineers, Plastics Encounter at ANTEC 2008. Vol. 2. p. 1296-1300 5 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

117 Scopus citations

Dramatic changes in glass transition temperature and physical aging via covalent attachment or attractive interactions between polymer and nanofiller

Rittigstein, P. & Torkelson, J. M., Dec 1 2008, AIChE100 - 2008 AIChE Annual Meeting, Conference Proceedings.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

77 Scopus citations

Effects of nanoscale confinement of polymers in films and nanocomposites: Tuning the glass transition by 100 K and diffusion coefficients by an order of magnitude

Roth, C. B., Mundra, M. K., Priestley, R. D., Kim, S., Hewlett, S. K. & Torkelson, J. M., Sep 29 2008, Society of Plastics Engineers - 66th Annual Technical Conference of the Society of Plastics Engineers, Plastics Encounter at ANTEC 2008. Vol. 3. p. 1663-1667 5 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Excellent dispersion and improved properties of polymer/multiwall carbon nanotube nanocomposites made via a two-step process of solid-state shear pulverization followed by melt mixing

Masuda, J. & Torkelson, J. M., Dec 1 2008, AIChE100 - 2008 AIChE Annual Meeting, Conference Proceedings.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Fabrication and characterization of polymer/multiwall carbon nanotube nanocomposites made via a two-step process of solid-state shear pulverization followed by melt mixing

Masuda, J. & Torkelson, J. M., Dec 1 2008, Topical Conference on New Advances in Polymer Characterization 2008. p. 37-40 4 p. (Topical Conference on New Advances in Polymer Characterization 2008).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

89 Scopus citations

Maximizing or eliminating the effects of nanoscale confinement on the glass transition in freely standing, supported, and multilayer polymer films

Kim, S., Roth, C. B. & Torkelson, J. M., Dec 1 2008, AIChE100 - 2008 AIChE Annual Meeting, Conference Proceedings. (AIChE Annual Meeting, Conference Proceedings).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Microphase separation and shear alignment of gradient copolymers: Melt rheology and small-angle X-ray scattering analysis

Mok, M. M., Pujari, S., Burghardt, W. R., Dettmer, C. M., Nguyen, S., Ellison, C. J. & Torkelson, J. M., Aug 12 2008, In : Macromolecules. 41, 15, p. 5818-5829 12 p.

Research output: Contribution to journalArticle

70 Scopus citations

Nanostructured polymer blends via conventional melt processing utilizing gradient copolymers as interfacial agent

Sandoval, R. W., Kim, J. & Torkelson, J. M., Sep 29 2008, Society of Plastics Engineers - 66th Annual Technical Conference of the Society of Plastics Engineers, Plastics Encounter at ANTEC 2008. Vol. 4. p. 2354-2358 5 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Novel, nanostructured, immiscible a/b polymer blends made by conventional melt processing: Addition of a/c gradient copolymer as an interfacial compatibilizer

Sandoval, R. W., Kim, J. & Torkelson, J. M., Dec 1 2008, AIChE100 - 2008 AIChE Annual Meeting, Conference Proceedings.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Novel characterization of critical micelle concentrations of block and gradient copolymers in homopolymer: Effects of sequence distribution, composition and molecular weight

Sandoval, R. W., Williams, D., Wong, C., Kim, J., Roth, C. B. & Torkelson, J. M., Dec 1 2008, AIChE100 - 2008 AIChE Annual Meeting, Conference Proceedings. (AIChE Annual Meeting, Conference Proceedings).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Novel effects of confinement and interfaces on the glass transition temperature and physical aging in polymer films and nanocomposites

Torkelson, J. M., Priestley, R. D., Rittigstein, P., Mundra, M. K. & Roth, C. B., Mar 13 2008, Complex Systems - 5th International Workshop on Complex Systems. Vol. 982. p. 192-195 4 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations

Novel nanocomposites made from polymer and as-received, unmodified graphite: Effects of graphite level and dispersion on mechanical and electrical properties, crystallization, and thermal stability

Wakabayashi, K., Brunner, P., Pierre, C., Hewlett, S. & Torkelson, J. M., Dec 1 2008, AIChE100 - 2008 AIChE Annual Meeting, Conference Proceedings.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polymer/multiwall carbon nanotube (MWCNT) nanocomposites made by solid-state shear pulverization (SSSP): Processing, dispersion and properties

Masuda, J., Kasimatis, K. G. & Torkelson, J. M., Sep 29 2008, Society of Plastics Engineers - 66th Annual Technical Conference of the Society of Plastics Engineers, Plastics Encounter at ANTEC 2008. Vol. 4. p. 2046-2050 5 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polymer - Graphite nanocomposites: Effective dispersion and major property enhancement via solid-state shear pulverization

Wakabayashi, K., Pierre, C., Diking, D. A., Ruoff, R. S., Ramanathan, T., Brinson, L. C. & Torkelson, J. M., Mar 25 2008, In : Macromolecules. 41, 6, p. 1905-1908 4 p.

Research output: Contribution to journalArticle

258 Scopus citations

Polymer-graphite nanocomposites: Effective dispersion and major property enhancement via solid-state shear pulverization

Wakabayashi, K., Brunner, P., Pierre, C. & Torkelson, J. M., Sep 29 2008, Society of Plastics Engineers - 66th Annual Technical Conference of the Society of Plastics Engineers, Plastics Encounter at ANTEC 2008. p. 1975-1979 5 p. (Technical Papers, Regional Technical Conference - Society of Plastics Engineers; vol. 4).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2007
49 Scopus citations