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Water absorption and desorption in an epoxy resin with degradation

✍ Scribed by G. Z. Xiao; M. E. R. Shanahan

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
209 KB
Volume
35
Category
Article
ISSN
0887-6266

No coin nor oath required. For personal study only.

✦ Synopsis

Hygrothermal aging at elevated temperatures tends to induce degradation in epoxy resins. To predict the effects of this degradation, a knowledge of absorption and transport behavior of water is needed. In this work, a model material (DGEBA/ DDA) has been employed to study the water absorption and absorption/desorption behavior during hygrothermal aging at 90ЊC, accompanied by degradation. The absorption results show an weight increase during the initial aging period followed by a decrease at later times. Absorption/desorption results show a similar phenomenon but with a net, overall weight loss after a certain period of aging. By assuming that water diffusion is approximately Fickian and that degradation of the resin is mainly caused by hydrolysis reactions, a model has been developed to describe the above-observed phenomena. Results show that the model is in good agreement with experimental data. Moreover, the model proposed can be used to estimate the average molecular weight of the intercrosslink chains after aging.

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