Abstract
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 language | English |
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Journal | Polymers for Advanced Technologies |
Volume | 19 |
Issue number | 9 |
Pages (from-to) | 1270-1275 |
ISSN | 1042-7147 |
DOIs | |
Publication status | Published - 2008 |
Keywords
- ionomer membranes
- doped polybenzimidazole
- conductivity
- polymer electrolyte