Lee, Hye-Jin Lee, Dong Hoon Henkensmeier, Dirk Jang, Jong Hyun Cho, Eun Ae Kim, Hyoung-Juhn Kim, Hwayong 2024-01-20T13:34:54Z 2024-01-20T13:34:54Z 2021-09-05 2012-10-20 0253-2964 https://pubs.kist.re.kr/handle/201004/128759 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. English KOREAN CHEMICAL SOC COMPOSITE MEMBRANES PHOSPHORIC-ACID CATALYST LAYER POLYBENZIMIDAZOLE CONDUCTIVITY OPERATION LIQUID PEMFCS WATER Synthesis and Characterization of H3PO4 Doped Poly(benzimidazole-co-benzoxazole) Membranes for High Temperature Polymer Electrolyte Fuel Cells Article 10.5012/bkcs.2012.33.10.3279 1 BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.33, no.10, pp.3279 - 3284 BULLETIN OF THE KOREAN CHEMICAL SOCIETY 33 10 3279 3284 scie scopus kci ART001705211 000310659900022 2-s2.0-84867862342 Chemistry, Multidisciplinary Chemistry Article COMPOSITE MEMBRANES PHOSPHORIC-ACID CATALYST LAYER POLYBENZIMIDAZOLE CONDUCTIVITY OPERATION LIQUID PEMFCS WATER High-temperature polymer electrolyte fuel cell Membrane electrode assembly Polybenzimidazole Poly(benzimidazole-co-benzoxazole)