Effect of temperature on the viscoelastic and viscoplastic behavior of polypropylene

A. D. Drozdov

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Observations are reported on isotactic polypropylene in tensile tests with various cross-head speeds and relaxation tests in a wide interval of temperatures ranging from room temperature to 120°C. A constitutive model is derived for the viscoelastic and viscoplastic responses of a semicrystalline polymer at arbitrary deformations with small strains. The stress-strain relations involve 6 adjustable parameters that are found by fitting the experimental data. The presence of a critical temperature is demonstrated at which some parameters of the model reach their maxima. This temperature is associated with the α-relaxation temperature of polypropylene.

Original languageEnglish
Pages (from-to)411-434
Number of pages24
JournalMechanics of Time-Dependent Materials
Issue number4
StatePublished - 1 Nov 2010
Externally publishedYes


  • Constitutive modeling
  • Polypropylene
  • Thermal effects
  • Viscoelasticity
  • Viscoplasticity


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