Microscopic theory of convective constraint release

S. T. Milner, T. C.B. McLeish, A. E. Likhtman

Research output: Contribution to journalArticle

117 Scopus citations

Abstract

We develop a microscopic description of the contribution to stress relaxation in entangled polymer melts of convective constraint release, which is the release of entanglement constraints due to the effects of convective flow on chains surrounding a given chain. Our theory resolves three of the main shortcomings of the Doi-Edwards model in nonlinear theology, in that it predicts (1) a monotonically increasing shear stress as a function of shear rate, (2) shear stress independent of molecular weight at sufficiently high shear rates, and (3) only modest anisotropies in the single chain scattering function, in agreement with experiment. In addition, our approach predicts that a stress maximum and resulting shear-banding instability would occur for living micelle solutions, as observed.

Original languageEnglish (US)
Pages (from-to)539-563
Number of pages25
JournalJournal of Rheology
Volume45
Issue number2
DOIs
StatePublished - Mar 1 2001

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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