The effect of introduction of silica particles prepared by the sol-gel rocess on the gag transport properties of a polyimide membrane was tudied. The sorption and permeation of CO2 and CH4 were studied and orrelated with morphological changes in the p...
The effect of introduction of silica particles prepared by the sol-gel rocess on the gag transport properties of a polyimide membrane was tudied. The sorption and permeation of CO2 and CH4 were studied and orrelated with morphological changes in the polymer structure. From orption isotherms, the composite membrane showed higher solubility Coefficients than the polyimide one. The solubility coefficient ratio between the composite and polyimide is about 1.5-2.0. From Permeation experiments, the composite membrane showed higher Permeability coefficients than the polyimide one. The increase of Permeability coefficient appears to be the result of a solubility enhancement in the organic matrix of the composite rather than a diffusion enhancement in the voids at the polyimide-silica interphase.