This review paper deals with mass transport in macromolecular materials. The study of mass transport through polymeric composite materials for example has applications in a variety of areas such as coatings, packaging and gas separations, to name just a few. Here we discuss several models for diffusion as well as several experimental techniques. In particular, we discuss models for case II diffusion, from a continuum mechanics point of view as well as via a mesoscopic theory. Variables such as temperature, molecular structure and mechanical deformation, affecting mass transport are also discussed.

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ABSTRACT:The model proposed by Cohen and collaborators is used to describe the process of diffusion through polymeric membranes subjected to externally applied extensions. This continuum mechanics approach is compared with a model developed via a mesoscopic theory. Experimental data on a variety of polymer/solvent systems are successfully described by the model. It was found that the flux-versus-time curves for deformations up to 80% elongation could be reduced to a master curve.

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