Amino-Functional Polybenzimidazole Blends with Enhanced Phosphoric Acid Mediated Proton Conductivity as Fuel Cell Electrolytes

David Aili, Irakli Javakhishvili, Junyoung Han, Katja Jankova Atanasova, Chao Pan, Søren Hvilsted, Jens Oluf Jensen, Niels J. Bjerrum, Qingfeng Li

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Abstract

A new amino-functional polybenzimidazole copolymer is synthesized by homogeneous solution condensation polymerization from a novel monomer, N,N′-bis (2,4-diaminophenyl)-1,3-diaminopropane. The copolymer readily dissolves in organic solvents and shows good film forming characteristics. To balance the phosphoric acid uptake and to obtain mechanically robust membranes, the amino-functional polybenzimidazole derivative is blended with high molecular weight poly [2,2′-(m-phenylene)-5,5′-bisbenzimidazole] at different ratios. Due to the high acid uptake, the homogenous blend membranes show enhanced proton conductivity at temperatures well above 100 °C as also confirmed by the fuel cell polarization data.
Original languageEnglish
JournalMacromolecular Chemistry and Physics
Volume217
Issue number10
Pages (from-to)1161-1168
ISSN1022-1352
DOIs
Publication statusPublished - 2016

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