A Simple Model for the Deformation-Induced Relaxation of Glassy Polymers

Details A Simple Model for the Deformation-Induced Relaxation of Glassy Polymers A Simple Model for the Deformation-Induced Relaxation of Glassy Polymers

2011-10-18

arxiv.org/abs/1110.4028v1

Physics

Condensed Matter

Soft Condensed Matter

9 pages, 5 figures

Scientific paper

Glassy polymers show strain hardening: at constant extensional load, their flow first accelerates, then arrests. Recent experiments have found this to be accompanied by a striking and unexplained dip in the segmental relaxation time. Here we explain such behavior by combining a minimal model of flow-induced liquefaction of a glass, with a description of the stress carried by strained polymers, creating a non-factorable interplay between aging and strain-induced rejuvenation. Under constant load, liquefaction of segmental motion permits strong flow that creates polymer-borne stress. This slows the deformation enough for the segmental modes to re-vitrify, causing strain hardening.

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