Transport of water and gases through EVA/PVC blend films—permeation and DSC investigations

摘要: Abstract The transport of water vapor and gases (oxygen carbon dioxide) through poly(ethylene-co-vinyl acetate) (EVA) films different VA content, poly(vinylchloride) (PVC) EVA/PVC blend films, was analysed from permeation measurements. A plasticization effect on the material observed for EVA with more than 19% wt. content blends, while gas practically all experimental curves are characterized by a constant diffusion coefficient, whatever copolymer used. increase in absorption leads to steady permeability copolymers. By mixing glassy PVC polymer (in rubbery state) reduced is observed, resulting mainly decrease diffusivity due low segment mobility dense able create hydrogen bonds between atoms Cl-substituted carbonyls. Compared copolymers, blends equivalent contents better terms selectivity.