Novel PMDA-ODA Polyimide/Polystyrene Nanocomposite Membranes for Carbon Dioxide Separation
نویسندگان
چکیده
Using N,N-dimethylacetalamide (DMAc) as the suspension media of polystyrene (PS) and poly[styrene-co-(4-vinyl-pyridin)] (PSVP) nanoparticles, insitu condensation polymerization of dianhydride and diamine was carried out and homogenous polyamic acid solution containing the nanoparticles were obtained. Novel PMDA-ODA nanocomposite membranes with various contents of nanoparticles were prepared by the casting of polyamic acid solution followed imidization. The distribution of the nanoparticles in the membranes and the morphology of the composite membranes were characterized by TEM. Relative homogenous distributions were observed for the polyimide/PSVP nanocomposite membrane, which can be ascribed to the formation of polyamic acid amine salts between pyridinyl and carboxyl. The gas transport properties of CO2, N2, and CH4 for these nanocomposite membranes were investigated at different temperature. It was found that the membrane containing 20% PSVP nanoparticles show both high gas permeability and high permselectivity.
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