Simple Model for the Deformation-Induced Relaxation of Glassy Polymers

Fielding, S.M.; Larson, R.G.; Cates, M.E.

Abstract

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 nonfactorable 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 revitrify, causing strain hardening.

Citation

Fielding, S., Larson, R., & Cates, M. (2012). Simple Model for the Deformation-Induced Relaxation of Glassy Polymers. Physical Review Letters, 108(4), Article 048301. https://doi.org/10.1103/physrevlett.108.048301

• Journal Article Type: Article
• Publication Date: Jan 1, 2012
• Deposit Date: Jan 31, 2012
• Publicly Available Date: Nov 28, 2012
• Journal: Physical Review Letters
• Print ISSN: 0031-9007
• Electronic ISSN: 1079-7114
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 108
• Issue: 4
• Article Number: 048301
• DOI: https://doi.org/10.1103/physrevlett.108.048301
• Public URL: https://durham-repository.worktribe.com/output/1510078