Multicomponent non‐fickian diffusion through inhomogeneous polymer membranes

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Abstract
We point out explicitly the dependence of the non‐Fickian diffusive flows of low molecular weight penetrants through a polymer membrane possessing a gradient in internal composition or a local property, such as a stress, on the gradient of the chemical potential of the polymeric substance. The possibility of maintaining for sufficiently long times a gradient in internal composition or property in these substances is a consequence of the long relaxation times encountered in these substances. A number of ways are suggested for preparing such membranes. Certain consequences for the diffusive separation of penetrants by such membranes are noted.

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