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Abstract
A series of processable fluorinated poly(ether amide)s (PAs) were synthesized from a new diamine monomer, 1,4-bis-[{2′-trifluromethyl 4′-(4″-aminophenyl)phenoxy}] phenyl with four different aromatic dicarboxylic acids. The polymers have been well characterized by GPC, FTIR, NMR, XRD and thermal techniques. The PAs showed excellent thermal stability (411–468 °C for 10% weight loss), high glass transition temperatures (243–290 °C), high tensile strengths up to 83.9 MPa and elongation at break up to 21%. PA ‘ 6a’ showed highest permeability in barrer for P CO 2 = 55.41 , P O 2 = 14.09 , P N 2 = 2.38 , P CH 4 = 2.29 . PA ‘ 6b’ showed highest permselectivities for CO 2 and CH 4 ( P CO 2 / P CH 4 = 36.83 ) as well as for O 2 and N 2 gas pairs ( P O 2 / P N 2 = 8.05 ) among the series. It has been attempted to draw a structure–property correlationship between the chemical structures of the polymers and their gas transport properties on the basis of their FFV, glass transition temperatures, and chain packing density.
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