Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 373, Issue 1-2, Pages 80-88Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2011.02.039
Keywords
Cross-linking; Direct casting; Fuel cells; Membranes; Poly(2,5-benzimidazole) (ABPBI)
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Funding
- Brain Korea Program
- Korea Science and Engineering foundation [R01-2006-000-10749-0]
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Cross-linked poly(2,5-benzimidazole) (C-ABPBI) membranes consisting of wholly aromatic groups were prepared by a reaction between three-arm poly(2,5-benzimidazole)s with three carboxylic acid end groups (T-ABPBI) and 3,3'-diaminobenzidine (DABI) in poly(phosphoric acid) (PPA) during the casting process. T-ABPBI was prepared by the polymerization of 3,4-diaminobenzoic acid and 1,3,5-benzenetricarboxylic acid in PPA, and the polymerization solution was directly used for the casting process. The cross-linking process improved the chemical stability of the host polymer, poly(2,5-benzimidazole) (ABPBI). The C-ABPBI membranes could contain a larger phosphoric acid (PA) content than the membranes of linear polybezimidazoles, such as ABPBI and poly[2,2'-(m-phenylene)-5,5'-bibenzimidazole]. Consequently, the C-ABPBI membranes showed higher proton conductivity values than the linear polymer membranes. For example, the C-ABPBI-50 membrane could contain a PA content > 84 wt.% with a proton conductivity of 0.12 S cm(-1) at 150 degrees C under anhydrous conditions. (C) 2011 Elsevier B.V. All rights reserved.
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