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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis, characterization, and gas transport properties of new semifluorinated poly(ether imide)s containing cardo moiety
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Synthesis, characterization, and gas transport properties of new semifluorinated poly(ether imide)s containing cardo moiety

机译：Synthesis, characterization, and gas transport properties of new semifluorinated poly(ether imide)s containing cardo moiety

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摘要

A series of new semifluorinated poly(ether imide)s (PEI)s was synthesized from a diamine monomer, 9,9-bis-3-phenyl-4-{2-trifluoromethyl-4-(4-aminophenyl)phenoxy} phenylfluorene on reaction with three different aromatic dianhydrides namely, 4,4-(4,4-isopropylidenediphenoxy)bis(phthalic anhydride), 4,4'-(hexafluoro-isopropylidene)diphthalic anhydride, and 4,4'-oxydiphthalic anhydride. The PEIs were well characterized by elemental analysis, spectroscopic, thermal, mechanical, electrical, and optical techniques. The synthesized PEIs showed high glass transition temperature (T-g up to 288 degrees C) and high thermal stability (T-d,T-10 up to 521 degrees C under synthetic air), high tensile strength, up to 76 MPa and low dielectric constant () (2.35-2.61 at 1 MHz). The membranes prepared from these polymers were studied for their gas permeability for four different gases CO2, O-2, N-2, and CH4. The PEI membranes showed high gas permeability (P-CO2 up to 70.3 and P-O2 up to 16.7 Barrer) and high permselectivity (P-CO2/P-CH4 up to 73.6 and P-O2/P-N2 up to 13.4); for the O-2/N-2 gas pair the PEIs surpassed the present upper boundary limit of 2008 drawn by Robeson. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45213.

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