Linear thermo-viscoelasticity of polypropylene

A. D. Drozdov

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Observations are reported on isotactic polypropylene in tensile relaxation tests in a wide interval of temperatures (from -20 to 120 °C) that involves α- and β-relaxation points. Constitutive equations are derived for the linear viscoelastic response of semicrystalline polymers. A polymer is modeled as an equivalent transient network of chains, whose rearrangement is governed by the Eyring equation with a fictive temperature. The stress-strain relations involve four adjustable parameters that are found by fitting the experimental data. It is demonstrated that (i) the dimensionless fictive temperature reaches its maximum at the α-relaxation point, and (ii) the rate of rearrangement increases with temperature following the Arrhenius law outside the β-relaxation region.

Original languageEnglish
Pages (from-to)690-695
Number of pages6
JournalMechanics Research Communications
Volume37
Issue number8
DOIs
StatePublished - 1 Dec 2010
Externally publishedYes

Keywords

  • Mechanical relaxation
  • Polypropylene
  • Thermal effects
  • Viscoelasticity

ASJC Scopus subject areas

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

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