Diffusion of Impurities in Amorphous Polymers

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Abstract
The data of Ryskin on diffusion of impurities into amorphous polymers appear to be consistent with the prediction of elastic continuum theory that the ratio of the entropy of activation, ΔS ‡, to the enthalpy of activation, ΔH ‡, is independent of the nature of the diffusing impurity. The ratio, ΔS ‡/ΔH ‡, depends only on the host polymer, and is approximately equal to 4α, where α is the volume thermal expansion coefficient of the polymer. The concentration dependence of the diffusion coefficient is roughly explained by the continuum theory on the basis of swelling.

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