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• W2059875892 abstract "Abstract Gas permeation behavior of a series of thermally stable N-substituted polybenzimidazoles by systematically varying bulk and flexibility of the substituent was investigated. Two different PBIs having variation in their acid moiety, viz., PBI-I (based on isophthalic acid) and PBI-BuI (based on 5-tert-butyl isophthalic acid) were selected for N-substitution by alkyl groups possessing different bulk and flexibility. These substituent groups were methyl, n-butyl, methylene trimethylsilane and 4-tert-butylbenzyl. Pure gas sorption and permeability using H2, N2, O2, CH4 and CO2 were investigated and correlated with physical properties of formed polymers. Estimation of dual-mode sorption parameters, coefficients of sorption, permeability and diffusion for different gases provided an insight towards effects of nature of a substituent group and parent PBI on governing gas sorption and permeation properties. By changing the substituent group, diffusivity coefficients was found to vary to a larger extent than the solubility coefficient. This significantly enhanced gas permeability for different gases by 1.2–129 times than that of parent PBIs. The permselectivity P O 2 / P N 2 was increased (up to 237%), while for other gas pairs, it was decreased to a different extent." @default.
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• W2059875892 date "2010-07-15" @default.
• W2059875892 modified "2023-10-11" @default.
• W2059875892 title "Investigation of gas permeation properties of systematically modified polybenzimidazoles by N-substitution" @default.
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• W2059875892 doi "https://doi.org/10.1016/j.memsci.2010.04.014" @default.
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