Morphologically controlled thermotropic liquid crystalline polymer blended high selective gas separation membranes

摘要

Liquid crystalline polymer blended gas separation membranes are obtained by melting and processing 50~99 wt % of a thermoplastic resin, 1~50 wt % of a thermotropic liquid crystalline polymer and 0.1~10 wt % of a compatibilizer based on the weight of the thermotropic liquid crystalline polymer. A method for fabricating liquid crystalline polymer blended gas separation membrane includes the steps of: mixing 50~99 wt % of thermoplastic resin, 1~50 wt % of thermotropic liquid crystalline polymer and 0.1~10 wt % of compatibilizer based on the weight of the thermotropic liquid crystalline polymer; and biaxially extruding the resulting blend melt from an extrusion die of a film blowing apparatus to fabricate a film. The gas separation membrane exhibits high permeability exceeding the limit value which has been hardly overcome by the existing separation membranes. This enhanced permeability is ascribed to the morphology of the ternary blends and different interaction between the compatibilizer and diffusing gases