期刊
POLYMER INTERNATIONAL
卷 54, 期 1, 页码 175-179出版社
WILEY
DOI: 10.1002/pi.1671
关键词
polybenzimidazole; methylation; ethylation; solubility
In this paper, synthesis of poly (N-methylbenzimidazole) (PNMBI) and poly(N-ethylbenzimidazole) (PNEBI) with various alkylation degrees was achieved by adding enough LiH and controlling the amount of substituting reactant. The degree of substituted methyl or ethyl was determined by elemental analysis. Changes in infrared spectroscopy due to nature and degree of substitution can clearly be found. With the modification of PBI, the solubility of PNMBI and PNEBI is improved significantly. There is no significant change of chemical structure of PNMBI after 0.5 h thermal treatment in both N-2 and air at a temperature lower than 250 degreesC. Compared with PBI, the methanol permeability of PNMBI and PNEBI is a little higher but still of the same order of magnitude. (C) 2004 Society of Chemical Industry.
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