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- W1978392583 abstract "Gas transport properties of a series highly fluorinated polyamideimides based on 2,2-bis(3,4-decarboxyphenyl)hexafluoropropane dianhydride and N,N-bis(amino-phenyl)-perfluoroalkane-α,ω-dicarboxamide diamines have been measured as a function of upstream pressure and temperature. The results show that the permeability coefficients P for the penetrant gases in any of the four polyamideimides decrease in the gas order: P(CO2) > P(O2) > P(N2) > P(CH4), while the permeabilities for a given gas in these polymers increase with the increase of oligo(tetrafluoroethene) segment length. The effects of the substitution pattern of the phenyl ring and the length of the oligo(tetrafluoroethene) segments in the diamine moieties on gas permeabilities, diffusivities and solubilities are discussed. It seems that, comparing with the effect of the flexible oligo(tetrafluoroethene) segment, the substitution patterns of phenyl group in the diamine moieties have no notable effect of the diffusivities in the polyamideimides as the length of the oligo(tetrafluoroethene) segment increasing from 8 to 12 carbons. The activation energies of permeation and diffusion were obtained for the gas/polymer pairs studied and correlated with the size of penetrant gas." @default.
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- W1978392583 date "1997-02-01" @default.
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- W1978392583 title "Gas transport properties of highly fluorinated polyamideimides" @default.
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- W1978392583 doi "https://doi.org/10.1016/s0032-3861(96)00549-6" @default.
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