The effect of thermal oxidative degradation of polymers on their viscoelastic response

A. D. Drozdov

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

A model is developed for thermal oxidative degradation of polymer melts and its effect on their viscoelastic response. Based on the theory of temporary heterogeneous networks, stress-strain relations are derived for the time-dependent behavior of a polymer melt at arbitrary three-dimensional deformations with small strains. Within the fragmentation-annihilation concept, kinetic equation is proposed for the distribution of strands with various lengths in a network, and its explicit solution is obtained. Material parameters in the constitutive equations are found by fitting experimental data in shear oscillation tests on a polypropylene melt annealed at elevated temperatures for various times. Good agreement is demonstrated between the observations and the results of numerical simulation.

Original languageEnglish
Pages (from-to)882-904
Number of pages23
JournalInternational Journal of Engineering Science
Volume45
Issue number11
DOIs
StatePublished - 1 Nov 2007

Keywords

  • Fragmentation-annihilation
  • Polypropylene
  • Thermal oxidative degradation
  • Viscoelasticity

ASJC Scopus subject areas

  • Materials Science (all)
  • Engineering (all)
  • Mechanics of Materials
  • Mechanical Engineering

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