Abstract
Gas permeation was investigated for a polycarbonate (PC)/N-(4-ethoxy-benzylidene)-4′-butylaniline (EBBA) (=40/60 in wt%) composite membrane on the basis of its surface and internal structures. Scanning electron microscopic observations for the matrix polymer after extraction of EBBA with hot ethanol showed that EBBA molecules form a continuous phase in the three-dimensional network of PC fibrils. On the basis of sorption and sorption-desorption experiments the composite membrane could be regarded as a homogeneous medium in the range above the crystal-nematic phase transition temperature TKN. The permeability coefficients P for hydrocarbon gases in the composite membrane above TKN increased discontinuously 100—200 times as much as those below TKN over several degrees in the TKN range. P for hydrocarbon gases below TKN decreased with an increase in the number of carbon atoms, while those above TKN showed the opposite trend with an increase in the number of carbon atoms. These facts clearly indicated that permeation is predominantly controlled by diffusion below TKN and significantly by solubility above TKN.
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