Permeability, diffusivity, and solubility of benzene vapor and water vapor in high free volume silicon- or fluorine-containing polymer membranes

Abstract

The diffusivity, solubility, and permeability of benzene and water vapors, as well as nitrogen (i.e., major component of air) were systematically investigated for high free volume silicon-containing polymers, including, poly(dimethylsiloxane) (PDMS), poly(trimethylsilylmethylmethacrylate) (PTMSMMA), poly(1-trimethylsilyl-1-propyne) (PTMSP), fluorine-containing 2,2'-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA)-based polyimide. The infinite-dilution permeability coefficient, P0, of benzene vapor and water vapor was diffusion controlled and did not depend on either the mobility of the polymer segments, the space between polymer segments, or cohesive energy density of the polyme..