Physical aging in poly(methyl methacrylate)/poly(styrene-co-acrylonitrile) blends. Part II. Enthalpy relaxation

Jovan Mijovic, T. Ho, T. K. Kwei

Research output: Contribution to journalArticle

Abstract

An investigation of the effect of physical aging on excess enthalpy of compatible polymer blends was carried out. Poly(methyl methacrylate) (PMMA) and poly(styrene-co-acrylonitrile) (SAN) were chosen for this study. Blends of different ratios of PMMA and SAN were physically aged at different times and temperatures below their glass transition (T g) and then subjected to enthalpy relaxation measurement in a differential scanning calorimeter (DSC). An improved procedure was developed and employed to analyze the data. The error associated with the calculation of the normalized deviation in enthalpy, known as the 'φ' function, was below 4%. The relaxation was observed to proceed faster at higher aging temperature.

Original languageEnglish (US)
Pages (from-to)1604-1610
Number of pages7
JournalPolymer Engineering and Science
Volume29
Issue number22
StatePublished - Nov 1989

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Acrylonitrile
Styrene
Polymethyl Methacrylate
Polymethyl methacrylates
Enthalpy
Aging of materials
Polymer blends
Calorimeters
Glass transition
Scanning
Temperature

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Physical aging in poly(methyl methacrylate)/poly(styrene-co-acrylonitrile) blends. Part II. Enthalpy relaxation. / Mijovic, Jovan; Ho, T.; Kwei, T. K.

In: Polymer Engineering and Science, Vol. 29, No. 22, 11.1989, p. 1604-1610.

Research output: Contribution to journalArticle

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