Abstract: The preparation of PAn/CA composite conductive membrane by in-situ permeating chemical polymerization was introduced in this paper.By this method, polyaniline was synthesized onto the pore wall of the CAmicroporous membrane.The influence of preparing conditions on the conductivity and apparent selectivity of CO₂/O₂was investigated.The pore size and distribution of the resulting membrane were evaluated by the method based on bubble pressure and liquid permeation.SEM, FTIRwere employed to characterize the composite membrane.The results showed that the pore size of PAn/CA composite membrane decreased and the pore size distribution became narrow, and the apparent selectivity of CO₂/O₂were improved.

Key words: Conductive polymer, Composite membranes, In-situ permeating polymerization