期刊
POLYMER DEGRADATION AND STABILITY
卷 97, 期 3, 页码 264-272出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2011.12.024
关键词
2-Phenyl-imidazolium hydroxide; NMR; Hydrolysis; Polybenzimidazole; Anion exchange membrane; Polymer electrolyte
资金
- fundamental R&D Program for Core Technology of Materials [M2009010025]
- Ministry of Knowledge Economy (MKE), Republic of Korea
- GOI
- Korea Institute of Science and technology
- Korea Evaluation Institute of Industrial Technology (KEIT) [K0006060] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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 amine-amide. Further hydrolysis necessitates excess hydroxide. (C) 2012 Elsevier Ltd. All rights reserved.
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