Henkensmeier, Dirk Cho, Hyeong-Rae Kim, Hyoung-Juhn Kirchner, Carolina Nunes Leppin, Janine Dyck, Alexander Jang, Jong Hyun Cho, EunAe Nam, Suk-Woo Lim, Tae-Hoon 2024-01-20T15:05:13Z 2024-01-20T15:05:13Z 2021-09-05 2012-03 0141-3910 https://pubs.kist.re.kr/handle/201004/129454 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. English ELSEVIER SCI LTD EXCHANGE MEMBRANE FUEL-CELLS IONOMER Polybenzimidazolium hydroxides - Structure, stability and degradation Article 10.1016/j.polymdegradstab.2011.12.024 1 POLYMER DEGRADATION AND STABILITY, v.97, no.3, pp.264 - 272 POLYMER DEGRADATION AND STABILITY 97 3 264 272 scie scopus 000300923500009 2-s2.0-84862790273 Polymer Science Polymer Science Article EXCHANGE MEMBRANE FUEL-CELLS IONOMER 2-Phenyl-imidazolium hydroxide NMR Hydrolysis Polybenzimidazole Anion exchange membrane Polymer electrolyte