Estimation of diffusion coefficients for trace amounts of solvents in glassy and molten polymers

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Abstract
Two methods based on the free‐volume theory of transport are developed for the estimation of diffusion coefficients for trace amounts of solvents in amorphous polymers. The first method uses diffusivity data for a polymer–solvent system above the glass transition temperature to estimate the temperature dependence of the mutual diffusion coefficient below this temperature. In the second method, mutual diffusion coefficients are estimated for a particular polymer–solvent system both above and below the glass transition temperature using no diffusivity data for the system. The predictions of the proposed theory are compared with diffusivity data for the n‐pentane–polystyrene and ethylbenzene–polystyrene systems.

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