Diffusion of benzene, toluene and styrene in polyvinylchloride films

It has been found that the swelling of polyvinylchloride films in benzene, toluene and styrene is accompanied by a continuous increase in the coefficients of diffusion of these solvents in the films. At the same time major differences have been found in the types of dependence of diffusion coefficients for these three solvents relative to solvent contents in the films. The penetration of solvents into the films is accompanied by changes in their dielectric parameters. Therefore the increase in diffusion coefficients may be attributed to a corresponding reduction in the “structural factor” g for polar groups of PVC.