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Diffusion of water in glassy epoxide prepolymers

✍ Scribed by J. L. Garcia-Fierro; J. V. Aleman

Publisher
Society for Plastic Engineers
Year
1985
Tongue
English
Weight
439 KB
Volume
25
Category
Article
ISSN
0032-3888

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✦ Synopsis

Abstract

Sorption isotherms show that epoxide prepolymers sorb water in increasing amounts as the temperature decreases and the water vapor concentration increases. Below T~g~ the behavior is typical of a Fickian transport combined with a relaxation process. Diffusion coefficients as function of sorption rates provide temperature shift factors from which the activation energy for diffusion is 35.3 KJ/mol. Combined effect of temperature and water concentration is described by a second order polynomial.

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