期刊
JOURNAL OF MEMBRANE SCIENCE
卷 357, 期 1-2, 页码 134-142出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2010.04.014
关键词
Polybenzimidazole; N-Substitution; Gas permeation; Sorption; Diffusion
资金
- Department of Science and Technology, Government of India [SR/S3/CE/49/2006]
- Council of Scientific and Industrial Research
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 H-2, N-2, O-2, 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-O2/P-N2 was increased (up to 237%), while for other gas pairs, it was decreased to a different extent. (C) 2010 Elsevier B.V. All rights reserved.
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