Henkensmeier, Dirk Kim, Hyoung-Juhn Lee, Hye-Jin Lee, Dong Hoon Oh, In-Hwan Hong, Seong-Ahn Nam, Suk-Woo Lim, Tae-Hoon 2024-01-20T16:03:39Z 2024-01-20T16:03:39Z 2021-09-05 2011-10-12 1438-7492 https://pubs.kist.re.kr/handle/201004/129892 A series of methyl, benzyl, and mixed polybenzimidazolium halides was synthesised and characterised by NMR spectroscopy. Membranes were formed and ion exchanged with hydroxides. These membranes are of interest for use in potentially platinum-free anionic exchange membrane fuel cells. Crosslinked membranes were obtained by the addition of alpha,alpha'-dibromo-p-xylene to the casting solution. The ion conductivity of membranes was determined by impedance spectroscopy. A hydroxide conductivity of 29 mS . cm(-1) at 26 degrees C and 58 mS . cm(-1) at 60 degrees C was obtained. The thermal and hydrolytic stability was investigated and a pathway for hydrolytic degradation proposed. Hydroxide ions react at the 2 position, the intermediate carbinol opens to the amine-amide, and further degrades under chain scission to diamine and carboxylic acid. English WILEY-BLACKWELL ANION-EXCHANGE MEMBRANES FUEL-CELL APPLICATIONS ALKALINE MEDIA IONIC LIQUIDS HYDROXIDE Polybenzimidazolium-Based Solid Electrolytes Article 10.1002/mame.201100100 1 MACROMOLECULAR MATERIALS AND ENGINEERING, v.296, no.10, pp.899 - 908 MACROMOLECULAR MATERIALS AND ENGINEERING 296 10 899 908 scie scopus 000296421800003 2-s2.0-80053946353 Materials Science, Multidisciplinary Polymer Science Materials Science Polymer Science Article ANION-EXCHANGE MEMBRANES FUEL-CELL APPLICATIONS ALKALINE MEDIA IONIC LIQUIDS HYDROXIDE anionic exchange membranes degradation membranes polybenzimidazole polymer electrolyte fuel cells (PEFC)