Stress-induced densification of glassy polymers in the subyield region

Aleksey D. Drozdov

Research output: Contribution to journalArticlepeer-review

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Abstract

Constitutive equations are derived for the viscoelastic response of amorphous glassy polymers in the region of subyield deformations. The model treats an amorphous polymer as a composite material consisting of an ensemble of flow units, immobile holes, and clusters of interstitial free volume moving through a network of long chains to and from voids. Changes in macropressure lead to an increase in the equilibrium concentration of interstitial free volume that, in turn, induces diffusion of free-volume elements from holes. The mass flow results in dissolution of voids that is observed as time-dependent densification of a glassy polymer. It is demonstrated that the model correctly predicts stress relaxation and a decrease in the specific volume observed in uniaxial tensile and compressive tests on polycarbonate at room temperature.

Original languageEnglish
Pages (from-to)1705-1718
Number of pages14
JournalJournal of Applied Polymer Science
Volume74
Issue number7
DOIs
StatePublished - 1 Dec 1999
Externally publishedYes

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