The usefulness of two diffusion models of differing complexity has been examined in the case of hydrothermal aging of a unidirectional glass fibre reinforced epoxy composite. It has been shown that water absorption in this material under immersion conditions cannot be explained on the basis of simple single-free-phase diffusion into the resin and that a more complex description is needed.
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Dewimille et al. (1982) studied this question.
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