Effect of bulky groups on gas transport properties of semifluorinated poly(ether amide)s containing pyridine moiety

Add time:07/13/2019    Source:sciencedirect.com

A series of processable new aromatic polyamides (PAs) were prepared by the reaction of a new diacid monomer namely, 2,6-bis[3′-trifluoromethyl-4′(4″-carboxyphenoxy)benzyl]pyridine and previously reported four diamines monomers. The synthesized PAs showed high thermal stability (up to 468 °C in air, for 10% weight loss), high glass transition temperature (243–254 °C) and tensile strength up to 95 MPa. The membranes prepared from these polymers were investigated for their gas permeability for four different gases CH4, N2, O2 and CO2. The PA membranes showed high gas permeability (PCO2 up to 81 and PO2 up to 20 barrer) and high permselectivity (PCO2/PCH4 up to 47.50 and PO2/PN2 up to 6.9). The gas transport properties have been correlated with the polymer structures and fractional free volume (FFV).

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