Abstract
We have investigated the absorption of cyclohexane vapor into polystyrene films and the resulting polymer interdiffusion that is enabled by this process. The swelling of films due to solvent absorption was relatively insensitive to the film thickness or polymer molecular weight but increased with increasing temperature. The interdiffusion enabled by absorbed solvent was examined in multilayered films comprising alternating layers of deuteriopolystyrene (dPS) and hydrogenous polystyrene (hPS). Deuterium concentration gradients were measured in dry films following exposure to cyclohexane vapor at controlled temperatures and times to establish the relationship between the coefficient of solvent accelerated interdiffusion, D*, and (i) Mw of hPS, (ii) Mw of both hPS and dPS, (iii) temperature, and (iv) film thickness. Scaling relationships were established for D* as a function of molecular weight. D* ∼ Mw-1 for increasing hPS molecular weight for Mw(hPS) M...
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