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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 10
BKCSDE 33(10)
October 20, 2012 

Synthesis and Characterization of H3PO4 Doped Poly(benzimidazole-co-benzoxazole) Membranes for High Temperature Polymer Electrolyte Fuel Cells
Hye-Jin Lee, Dong Hoon Lee, Dirk Henkensmeier, Jong Hyun Jang, Eun Ae Cho, Hyoung-Juhn Kim, Hwayong Kim*
High-temperature polymer electrolyte fuel cell, Membrane electrode assembly, Polybenzimidazole, Poly(benzimidazole-co-benzoxazole)
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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