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Phosphoric acid doped polybenzimidazole (PBI) membranes have been covalently cross-linked with dichloromethyl phosphinic acid (DCMP). FT-IR measurements showed new bands originating from bonds between the hydrogen bearing nitrogen in the imidazole group of PBI and the CH2 group in DCMP. The produced cross-linked membranes show increased mechanical strength, making it possible to achieve higher phosphoric acid doping levels and therefore higher proton conductivity. Oxidative stability is significantly improved and thermal stability is sufficient in a temperature range of up to 250 degrees C, i.e. within the temperature range of operation of PBI-based fuel cells.
Original languageEnglish
JournalPolymers for Advanced Technologies
Publication date2008
Volume19
Issue9
Pages1270-1275
ISSN1042-7147
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 6

Keywords

  • ionomer membranes, doped polybenzimidazole, conductivity, polymer electrolyte
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