Relating the shear-thinning curve to the molecular weight distribution in linear polymer melts

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Abstract

The double-reptation ansatz for stress relaxation in broadly polydisperse melts of linear chains relates the molecular weight distribution φ(n) and the dynamic viscosity η(ω), and has been used to infer φ(n) from rheological data. I show that the microscopic theory of constraint release implies the double-reptation model is valid for practical distributions φ(n). I also provide a heuristic theoretical argument for the Cox-Merz empirical rule that the shapes of the functions η*(ω) and η(γ̈) are similar, which allows the shear-thinning curve to be predicted.

Original languageEnglish (US)
Pages (from-to)303-315
Number of pages13
JournalJournal of Rheology
Volume40
Issue number2
DOIs
StatePublished - Jan 1 1996

All Science Journal Classification (ASJC) codes

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

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