Polybenzimidazolium hydroxides - Structure, stability and degradation

Title
Polybenzimidazolium hydroxides - Structure, stability and degradation
Authors
헨켄스마이어디억조형래김형준Carolina Nunes KirchnerJanine LeppinAlexander Dyck장종현조은애남석우임태훈
Keywords
2-Phenyl-imidazolium hydroxide; NMR; hydrolysis; Polybenzimidazole; Anion exchange membrane; Polymer Electrolyte
Issue Date
2012-03
Publisher
Polymer degradation and stability
Citation
VOL 97, NO 3, 264-272
Abstract
Polybenzimidazolium hydroxides are of potential interest for the use in alkaline anion exchange membrane fuel cells (AAEMFC). Introduction of an ether group in para-position of the 2-phenyl substituent improves the mesomeric stabilization of imidazolium cations, and O-PBI seems to be more stable than meta-PBI under alkaline conditions. NMR, IR and XPS analysis show a structural change when the iodide form is exchanged into the hydroxide form. Surprisingly, this structural change is subject to a pH sensitive equilibrium and the pure imidazolium form is retained immediately when the pH is lowered. The molecular structure at high pH is either the 2-carbinol or the amineeamide. Further hydrolysis necessitates excess hydroxide.
URI
http://pubs.kist.re.kr/handle/201004/42010
ISSN
01413910
Appears in Collections:
KIST Publication > Article
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