Effect of structure on stress relaxation of polymer blends in glassy state

Tai Ho, Jovan Mijovic, Connie Lee

Research output: Contribution to journalArticle

Abstract

Short-term stress-relaxation measurements were performed on blends of poly(methyl methacrylate) with poly(styrene-co-acrylonitrile), of polystyrene with poly(2,6-dimethyl-1,4-phenylene oxide) and poly(methyl methacrylate) with poly(vinylidene fluoride), at different temperatures below the glass transition region and a constant strain of 0.5%. Stress-relaxation moduli were analysed using the Williams-Watts equation. For amorphous blends, a universal value for the distribution parameter β of 0.41 was found, and the relaxation time τ showed a power-law correlation with ageing temperature and ageing time. The time and temperature dependences of τ changed with blend composition in systems containing polymers with dissimilar chemical structures, while little variation was observed in systems consisting of molecules of similar structures. Stress relaxation proceeded much faster in semicrystalline systems than in amorphous systems.

Original languageEnglish (US)
Pages (from-to)619-627
Number of pages9
JournalPolymer
Volume32
Issue number4
DOIs
StatePublished - 1991

Fingerprint

Stress relaxation
Polymer blends
Polymethyl Methacrylate
Polymethyl methacrylates
Aging of materials
Acrylonitrile
Styrene
Polystyrenes
Relaxation time
Temperature
Glass transition
Polymers
Molecules
Oxides
Chemical analysis

Keywords

  • morphology
  • physical ageing
  • polymer blends
  • stress relaxation
  • Williams-Watts equation

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Effect of structure on stress relaxation of polymer blends in glassy state. / Ho, Tai; Mijovic, Jovan; Lee, Connie.

In: Polymer, Vol. 32, No. 4, 1991, p. 619-627.

Research output: Contribution to journalArticle

Ho, Tai ; Mijovic, Jovan ; Lee, Connie. / Effect of structure on stress relaxation of polymer blends in glassy state. In: Polymer. 1991 ; Vol. 32, No. 4. pp. 619-627.
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