Abstract
The moisture absorption and desorption behaviour of a styrenated isophthalic unsaturated polyester resin has been examined. This resin system is believed to have a two-phase structure comprising particles of the dense phase embedded in a less dense matrix. The model developed in Part 1, which describes the diffusion behaviour of a two-phase resin system, has been applied to this system and the diffusion coefficients for both the dense and less dense phases calculated. The diffusion coefficient of the dense phase is found to be 30 times lower than that of the less dense matrix. The volume fraction of the former was estimated at 0.16, which was lower than expected. It is postulated that the microgel particles have a dense core and become progressively less dense towards the periphery.
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Jacobs, P.M., Jones, E.R. Diffusion of moisture into two-phase polymers. J Mater Sci 24, 2343–2347 (1989). https://doi.org/10.1007/BF01174494
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DOI: https://doi.org/10.1007/BF01174494