The Effect of PVAc on the CO2 Permselectivity of PMA-PDMS-PMA block copolymer/PVAc Blend Membranes

Poly(methyl acrylate)-poly(dimethyl siloxane)-poly(methyl acrylate)(PMA-PDMS-PMA) triblock copolymer was synthesized via atom transfer radical polymerization (ATRP). The effect of PVAc on the CO2permselectivity of the blend membranes with different block copolymer composition was investigated. The blend membranes were prepared via solution casting method and their gas permeation behavior through different gases such as CO2, N2, and CH4 were investigated. The permselectivity of PVAc/triblock copolymer blend membrane was related to the high polarity of PVAc. Fractional free volume of membranes were studied and correlated with CO2 permeability and permselectivity of the blend membranes