Abstract
Abstract A series of semifluorinated aromatic poly(ether amide)s (PA) were prepared from a new diamine; 1,1-bis-[4′-{2″-trifluromethyl 4″-(4″′-aminophenyl)phenoxy}phenyl]cyclohexane with five structurally different aromatic diacids. The PAs were characterized by elemental analysis, NMR, FTIR, GPC and thermal techniques. The polymers exhibited very good thermal and mechanical properties (441 °C for 10% weight loss in air, glass transition temperatures ranging from 239 to 258 °C and tensile strengths up to 86 MPa). Gas transport properties of these membranes were investigated for the four different gases (e.g., CH 4 , N 2 , O 2 and CO 2 ). These membranes showed good gas selectivity with comparable permeability with previously reported aromatic polyamides. PA ‘ 6A ’ showed high CO 2 and O 2 permeability (30.40 and 6.30 Barrer respectively) and PA ‘ 6E ’ showed high permselectivity for CO 2 /CH 4 (64.29) and O 2 /N 2 (10.67) gas pair. The effect of the presence of the cardo cyclohexylidene unit in the PA membranes towards the thermal, mechanical and gas permeation properties were correlated.
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