Fielding, S.M. and Larson, R.G. and Cates, M.E. (2012) 'Simple model for the deformation-induced relaxation of glassy polymers.', Physical review letters., 108 (4). 048301.
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.
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|Publisher Web site:||http://dx.doi.org/10.1103/PhysRevLett.108.048301|
|Publisher statement:||© 2012 American Physical Society|
|Record Created:||28 Nov 2012 09:35|
|Last Modified:||28 Nov 2012 11:06|
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