Synthesis and characterization of H3PO4 doped poly(benzimidazole-co-benzoxazole) membranes for high temperature polymer electrolyte fuel cells
- Synthesis and characterization of H3PO4 doped poly(benzimidazole-co-benzoxazole) membranes for high temperature polymer electrolyte fuel cells
- 이혜진; 이동훈; 헨켄스마이어디억; 장종현; 조은애; 김형준; Hwayong Kim
- High temperature PEMFC; Polybenzimidazole; High-temperature polymer electrolyte fuel cell; Membrane electrode assembly; Poly(benzimidazole-co-benzoxazole)
- Issue Date
- Bulletin of the Korean Chemical Society
- VOL 33, NO 10, 3279-3284
- Poly(benzimidazole-co-benzoxazole)s (PBI-co-PBO) are synthesized by polycondensation reaction with 3,3'-
diaminobenzidine, terephthalic acid and 3,3'-dihydroxybenzidine or 4,6-diaminoresorcinol in polyphosphoric
acid (PPA). All polymer membranes are prepared by the direct casting method (in-situ fabrication). The
introduction of benzoxazole units (BO units) into a polymer backbone lowers the basic property and H3PO4
doping level of the copolymer membranes, resulting in the improvement of mechanical strength. The proton
conductivity of H3PO4 doped PBI-co-PBO membranes decrease as a result of adding amounts of BO units. The
maximum tensile strength reaches 4.1 MPa with a 10% molar ratio of BO units in the copolymer. As a result,
the H3PO4 doped PBI-co-PBO membranes could be utilized as alternative proton exchange membranes in high
temperature polymer electrolyte fuel cells.
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