Permeability of dry gases and those dissolved in water through hydrophobic high free-volume silicon- or fluorine-containing nonporous glassy polymer membranes

Abstract

This study systematically investigates the oxygen and carbon dioxide permeability of dry gases and those dissolved in water through hydrophobic high free-volume silicon- or fluorine-containing nonporous glassy polymers including poly(trimethylsilylmethylmethacrylate) (PTMSMMA), poly(1-trimethylsilyl-1- propyne), 4,4′-(hexafluoroisopropylidene) diphthalic anhydride-4,4′- (9-fluorenylidene) dianiline, and 4,4′-(hexafluoroisopropylidene) diphthalic anhydride-2,3,5,6-tetramethyl-1,4-phenylene-diamine. The dry state gas permeability coefficient was almost higher than that of the wet state because the effect of the boundary layer, which is the water resistant layer, on the membrane surface depends..