Gas permeation properties of synthesized polyurethane-polydimethylsiloxane /polyamide 12-b-polytetrehydrofuran blend membranes

The permselectivity through blend membranes strongly depends on the membrane morphology and micro-phases structures, which depend on the specific volume fraction, size,shape of the dispersed and continuous phases of the membrane. The effect of the size and shape of micro-phaseson transport properties of polymer blends have been studied [1]. Polyurethanes (PU) have been accepted as an elastomer with high gas permeability. However, the use of PUmembranes for gas separation was limited by their low selectivity [2]. We have found that Polyurethane/Polyamide 12-b-Polytetrehydrofuran has an excellent gas separation property especially for the polarizable/ nonpolar gas. Other has reported CO2/N2 and CO2/H2 gas selectivity of poly (amide-b-ether) membranes. They have reported high CO2/N2 and CO2/H2 selectivity, attributed to the high CO2 solubilitydue to the strong affinity of the polar ether linkages for CO2 [3] . In this work we have studied the gas-permeation ofsynthesized PU-PDMS/PA12-b-PTHF blends. In particular, we have studied the effect of the poly (amide-b-ether) on permeability of gases in PU-PDMS/PA12-b-PTHF blend membrane