Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Synthesis and Characterization of H3PO4 Doped Poly(benzimidazole-co-benzoxazole) Membranes for High Temperature Polymer Electrolyte Fuel Cells

  • Lee, Hye-Jin (School of Chemical and Biological Engineering, Seoul National University (SNU)) ;
  • Lee, Dong-Hoon (Fuel Cell Center, Korea Institute of Science and Technology (KIST)) ;
  • Henkensmeier, Dirk (Fuel Cell Center, Korea Institute of Science and Technology (KIST)) ;
  • Jang, Jong-Hyun (Fuel Cell Center, Korea Institute of Science and Technology (KIST)) ;
  • Cho, Eun-Ae (Fuel Cell Center, Korea Institute of Science and Technology (KIST)) ;
  • Kim, Hyoung-Juhn (Fuel Cell Center, Korea Institute of Science and Technology (KIST)) ;
  • Kim, Hwa-Yong (School of Chemical and Biological Engineering, Seoul National University (SNU))
  • Received : 2012.03.27
  • Accepted : 2012.07.11
  • Published : 2012.10.20
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Abstract

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 $H_3PO_4$ doping level of the copolymer membranes, resulting in the improvement of mechanical strength. The proton conductivity of $H_3PO_4$ 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 $H_3PO_4$ doped PBI-co-PBO membranes could be utilized as alternative proton exchange membranes in high temperature polymer electrolyte fuel cells.

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