Mechanistic model for deformation of polymer nanocomposite melts under large amplitude shear

Erkan Senses, Pinar Akcora

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We report the mechanical response of a model nanocomposite system of poly(styrene) (PS)-silica to large-amplitude oscillatory shear deformations. Nonlinear behavior of PS nanocomposites is discussed with the changes in particle dispersion upon deformation to provide a complete physical picture of their mechanical properties. The elastic stresses for the particle and polymer are resolved by decomposing the total stress into its purely elastic and viscous components for composites at different strain levels within a cycle of deformation. We propose a mechanistic model which captures the deformation of particles and polymer networks at small and large strains, respectively. We show, for the first time, that chain stretching in a polymer nanocomposite obtained in large amplitude oscillatory deformation is in good agreement with the nonlinear chain deformation theory of polymeric networks.

Original languageEnglish
Pages (from-to)764-771
Number of pages8
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume51
Issue number9
DOIs
StatePublished - 1 May 2013

Keywords

  • deformation
  • nanocomposites
  • networks
  • nonlinear rheology
  • poly(styrene)- silica
  • polymer nanocomposite
  • polystyrene
  • stiffness

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