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Strain hardening of polymer glasses: Effect of entanglement density, temperature, and rate

✍ Scribed by Robert S. Hoy; Mark O. Robbins

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
576 KB
Volume
44
Category
Article
ISSN
0887-6266

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✦ Synopsis

Abstract

The strain hardening behavior of model polymer glasses is studied with simulations over a wide range of entanglement densities, temperatures, strain rates, and chain lengths. Entangled polymers deform affinely at scales larger than the entanglement length as assumed in entropic network models of strain hardening. The dependence of strain hardening on strain and entanglement density is also consistent with these models, but the temperature dependence has the opposite trend. The dependence on temperature, rate, and interaction strength can instead be understood as reflecting changes in the flow stress. Microscopic analysis of local rearrangements and the primitive paths between entanglements is used to test models of strain hardening. Β© 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 3487–3500, 2006

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