Polybenzimidazole‐based block copolymers: From monomers to membrane electrode assemblies for high temperature polymer electrolyte membrane fuel cells |
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| Authors: | Frank Schönberger Guoqing Qian Brian C Benicewicz |
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| Affiliation: | 1. Plastics Division, Fraunhofer Institute for Structural Durability and System Reliability LBF, Darmstadt, Germany;2. Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina |
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| Abstract: | In this study, PBI‐based block copolymers were developed and their performance as membranes in high temperature polymer electrolyte membrane fuel cells was evaluated. This type of block copolymer consists of “phosphophilic” PBI and “phosphophobic” non‐PBI segments. The final properties of such block copolymers strongly depended on the length of the individual blocks and their chemical structures. In a systematic approach, a series of various block copolymers was synthesized and characterized both in terms of ex situ properties (e.g., proton conductivity, phosphoric acid uptake, swelling behavior) and in situ fuel cell tests. A very poor membrane‐electrode interface limited the performance of the membrane electrode assemblies, but was remarkably improved in power output, stability, and long‐term durability by treating the electrode interface with a fluorinated PBI derivative. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55, 1831–1843 |
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| Keywords: | block copolymers high temperature polymer electrolyte fuel cell membranes membrane electrode assembly poly(arylene ether)s polybenzimidazole renewable resources telechelics |
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