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A generalized theory for the glass transition temperature of crosslinked and uncrosslinked polymers

✍ Scribed by H. Stutz; K.-H. Illers; J. Mertes

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
729 KB
Volume
28
Category
Article
ISSN
0887-6266

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✦ Synopsis

Abstract

A generalized theory for the glass transition temperature of crosslinked and uncrosslinked polymers has been developed, which takes into account the influences of end groups, branching, and crosslinking, and their functionality distribution. DiBenedetto's theory was found to correctly characterize the influence of crosslinks on the glass temperature. Normalized to constant crosslink functionality, the crosslink constant is a universal parameter suggesting that the entropic theory of glasses is applicable to crosslinked systems. Data on linear polymers and networks from the crosslinking of polymer chains, vinyl/divinyl‐copolymers and step‐growth polymers, such as polyurethanes, amine‐cured epoxies, or inorganic glasses, are presented.

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