Abstract
Solutions are presented for the Fickian and non-Fickian equations describing the case of penetrant transport in a glassy polymer. Due to associated macromolecular relaxation, a sharp penetrant front is observed which separates the glassy core from the rubbery (gel-like) layer at the surface. Concentration profiles are compared and general comments about Fickian versus non-Fickian transport in polymers are made.
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Peppas, N.A., Sinclair, J.L. Anomalous transport of penetrants in glassy polymers. Colloid & Polymer Sci 261, 404–408 (1983). https://doi.org/10.1007/BF01418213
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DOI: https://doi.org/10.1007/BF01418213