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Effect of chemical structure of amorphous polymers on heat capacity difference at glass transition temperature

Authors
Journal
Thermochimica Acta
0040-6031
Publisher
Elsevier
Publication Date
Volume
267
Identifiers
DOI: 10.1016/0040-6031(95)02483-2
Keywords
  • Amorphous Polymer
  • Glass Transition Temperature
  • Heat Capacity
Disciplines
  • Engineering

Abstract

Abstract The heat capacity of 21 kinds of glassy polymers, mainly synthesized in our laboratory, was measured by differential scanning calorimetry. Glass transition temperature ( T g) and the heat capacity difference between the molten state and the glassy state ( ΔC p) at T g were evaluated. A linear relationship was obtained between ΔC p and T g for almost all glassy polymers including engineering plastics, in a temperature range from 230 to 520 K, except for those having large side chains and/or inter-molecular hydrogen bondings. It was suggested that configurational entropic factors must be taken into consideration for analyzing glass transition.

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