The effect of temperature on the viscoelastic response of semicrystalline polymers

A. D. Drozdov, S. Agarwal, R. K. Gupta

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Three series of isothermal torsion relaxation tests were performed at various temperatures ranging from room temperature to T = 120°C on isotactic polypropylene, low-density polyethylene, and linear low-density polyethylene. Constitutive equations are derived for the viscoelastic behavior of a semicrystalline polymer at small strains. A polymer is treated as an equivalent network of strands bridged by temporary junctions (entanglements, physical crosslinks on the surfaces of crystallites, and lamellar blocks). The network is thought of as an ensemble of mesoregions with various activation energies for detachment of active strands from their junctions. The time-dependent response of the ensemble reflects thermally induced rear rangement of strands (separation of active strands from temporary junctions and merging of dangling strands with the network). Stress-strain relations are developed by using the laws of thermodynamics. The governing equations involve five adjustable parameters that are found by fitting the experimental data. This study focuses on the influence of temperature and crystalline morphology of polyolefins on the material parameters in the constitutive relations.

Original languageEnglish
Pages (from-to)9-23
Number of pages15
JournalJournal of Applied Polymer Science
Volume94
Issue number1
DOIs
StatePublished - 5 Oct 2004
Externally publishedYes

Keywords

  • Polyethylene
  • Polypropylene
  • Thermal properties
  • Viscoelastic properties

ASJC Scopus subject areas

  • Chemistry (all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'The effect of temperature on the viscoelastic response of semicrystalline polymers'. Together they form a unique fingerprint.

Cite this