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


Vol. 33,  No. 10, pp. 3279-3284, Oct.  2012
10.5012/bkcs.2012.33.10.3279


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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 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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  Cite this article

[IEEE Style]

H. Lee, D. H. Lee, D. Henkensmeier, J. H. Jang, E. A. Cho, H. Kim, H. Kim, "Synthesis and Characterization of H3PO4 Doped Poly(benzimidazole-co-benzoxazole) Membranes for High Temperature Polymer Electrolyte Fuel Cells," Bulletin of the Korean Chemical Society, vol. 33, no. 10, pp. 3279-3284, 2012. DOI: 10.5012/bkcs.2012.33.10.3279.

[ACM Style]

Hye-Jin Lee, Dong Hoon Lee, Dirk Henkensmeier, Jong Hyun Jang, Eun Ae Cho, Hyoung-Juhn Kim, and Hwayong Kim. 2012. Synthesis and Characterization of H3PO4 Doped Poly(benzimidazole-co-benzoxazole) Membranes for High Temperature Polymer Electrolyte Fuel Cells. Bulletin of the Korean Chemical Society, 33, 10, (2012), 3279-3284. DOI: 10.5012/bkcs.2012.33.10.3279.

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ISSN(Print) 0253-2964
ISSN(Online) 1229-5949