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Ransom TC, Roy D, Puskas JE, Kaszas G, Roland CM. Molecular Weight Dependence of the Viscosity of Highly Entangled Polyisobutylene. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00993] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Timothy C. Ransom
- Chemistry Division, Naval Research Laboratory, Code 6105, Washington, D.C. 20375, United States
- American Society for Engineering Education, Washington, D.C. 20036-2479, United States
| | - Debjani Roy
- Chemistry Division, Naval Research Laboratory, Code 6105, Washington, D.C. 20375, United States
- National Research Council, Washington, D.C. 20001, United States
| | - Judit E. Puskas
- Department Food, Agricultural, and Biological Engineering, The Ohio State University, Wooster, Ohio 44691, United States
| | - Gabor Kaszas
- PolyFiberMatrix LLC, Akron, Ohio 44325, United States
| | - C. Michael Roland
- Chemistry Division, Naval Research Laboratory, Code 6105, Washington, D.C. 20375, United States
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2
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Plonka A. Recent Developments in Dispersive Kinetics. PROGRESS IN REACTION KINETICS AND MECHANISM 2019. [DOI: 10.3184/007967400103165137] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In general, chemical reactions proceeding on time scales comparable to, or shorter than, those of internal rearrangements in a reaction system renewing the environment of the reactants (mixing), are dispersive. For dispersive kinetics, as for dispersive transport and dispersive relaxation, many time scales coexist. The rate coefficients for dispersive processes depend on time. For a time-dependent specific reaction rate, using the concept of energy profile along the reaction path, one finds the potential energy barrier separating reactants from products to evolve in time during the course of reaction. The evolution of the energy barrier during the course of reaction is described in terms of energy distribution functions related directly to the distribution function of logarithms of lifetimes calculable from kinetic equations with a time-dependent specific reaction rate. This phenomenological approach is compared with that in which the kinetic equations with time-dependent specific reaction rates are interpreted in terms of the superposition of classical reaction patterns. Special attention is paid to renor-malization of rate coefficients following from the stochastic theory of renewals (structural relaxation) in the reaction system. This phenomenological approach to kinetics is taken as a convenient basis to present a number of comprehensive models of dispersive kinetics developed in the 1990s and to discuss some recently published experimental data to show what one derives directly from experimental data and what the detailed mechanistic models have to account for to be acceptable.
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Affiliation(s)
- Andrzej Plonka
- Institute of Applied Radiation Chemistry, Wroblewskiego 15, 93-590 Lodz, Poland
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Affiliation(s)
- D. Roy
- Chemistry Division, Naval Research Laboratory, Code 6120, Washington, D.C. 20375-5342, United States
| | - C. M. Roland
- Chemistry Division, Naval Research Laboratory, Code 6120, Washington, D.C. 20375-5342, United States
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Wu J, Haddad TS, Mather PT. Vertex Group Effects in Entangled Polystyrene−Polyhedral Oligosilsesquioxane (POSS) Copolymers. Macromolecules 2009. [DOI: 10.1021/ma8024267] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jian Wu
- Polymer Program and Department of Chemical Engineering, University of Connecticut, Storrs, Connecticut 06269, and ERC, Inc., AFRL/PRSM, Edwards Air Force Base, California 93524
| | - Timothy S. Haddad
- Polymer Program and Department of Chemical Engineering, University of Connecticut, Storrs, Connecticut 06269, and ERC, Inc., AFRL/PRSM, Edwards Air Force Base, California 93524
| | - Patrick T. Mather
- Polymer Program and Department of Chemical Engineering, University of Connecticut, Storrs, Connecticut 06269, and ERC, Inc., AFRL/PRSM, Edwards Air Force Base, California 93524
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6
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Robertson CG, Rademacher CM. Coupling Model Interpretation of Thermorheological Complexity in Polybutadienes with Varied Microstructure. Macromolecules 2004. [DOI: 10.1021/ma0482415] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christopher G. Robertson
- Bridgestone Americas Center for Research and Technology, 1200 Firestone Parkway, Akron, Ohio 44317-0001
| | - Christine M. Rademacher
- Bridgestone Americas Center for Research and Technology, 1200 Firestone Parkway, Akron, Ohio 44317-0001
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7
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Development of cooperativity in the local segmental dynamics of poly(vinylacetate): synergy of thermodynamics and intermolecular coupling. POLYMER 2002. [DOI: 10.1016/s1089-3156(01)00011-3] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Chen HY, Stepanov EV, Chum SP, Hiltner A, Baer E. Linear Stress Relaxation Behavior of Amorphous Ethylene−Styrene Interpolymers. Macromolecules 2000. [DOI: 10.1021/ma0003598] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- H. Y. Chen
- Department of Macromolecular Science and Center for Applied Polymer Research (CAPRI), Case Western Reserve University, Cleveland, Ohio 44106-7202, and Polyethylene and INSITE Technology R & D, The Dow Chemical Company, Freeport, Texas 77541
| | - E. V. Stepanov
- Department of Macromolecular Science and Center for Applied Polymer Research (CAPRI), Case Western Reserve University, Cleveland, Ohio 44106-7202, and Polyethylene and INSITE Technology R & D, The Dow Chemical Company, Freeport, Texas 77541
| | - S. P. Chum
- Department of Macromolecular Science and Center for Applied Polymer Research (CAPRI), Case Western Reserve University, Cleveland, Ohio 44106-7202, and Polyethylene and INSITE Technology R & D, The Dow Chemical Company, Freeport, Texas 77541
| | - A. Hiltner
- Department of Macromolecular Science and Center for Applied Polymer Research (CAPRI), Case Western Reserve University, Cleveland, Ohio 44106-7202, and Polyethylene and INSITE Technology R & D, The Dow Chemical Company, Freeport, Texas 77541
| | - E. Baer
- Department of Macromolecular Science and Center for Applied Polymer Research (CAPRI), Case Western Reserve University, Cleveland, Ohio 44106-7202, and Polyethylene and INSITE Technology R & D, The Dow Chemical Company, Freeport, Texas 77541
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10
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Affiliation(s)
- P. G. Santangelo
- Chemistry Division, Code 6120, Naval Research Laboratory, Washington, D.C. 20375-5342
| | - C. M. Roland
- Chemistry Division, Code 6120, Naval Research Laboratory, Washington, D.C. 20375-5342
| | - J. E. Puskas
- Department of Chemistry & Biochemical Engineering, University of Western Ontario, London, Ontario N6A 5B9, Canada
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11
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Schroeder MJ, Roland CM. Normal Mode Relaxation of Polyisoprene in Blends with Vinyl Polybutadienes. Macromolecules 1999. [DOI: 10.1021/ma981271l] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. J. Schroeder
- Department of Chemistry, United States Naval Academy, Annapolis, Maryland 21402
| | - C. M. Roland
- Chemistry Division, Code 6120, Naval Research Laboratory, Washington, D.C. 20375-5342
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12
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Santangelo PG, Roland CM. Temperature Dependence of Mechanical and Dielectric Relaxation in cis-1,4-Polyisoprene. Macromolecules 1998. [DOI: 10.1021/ma971663c] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- P. G. Santangelo
- Chemistry Division, Code 6120, Naval Research Laboratory, Washington, D.C. 20375-5342
| | - C. M. Roland
- Chemistry Division, Code 6120, Naval Research Laboratory, Washington, D.C. 20375-5342
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