Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 423, Issue -, Pages 495-502Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2012.08.058
Keywords
Polybenzimidazole; High temperature proton exchange membrane; Fuel cells; End-group cross-linked network
Categories
Funding
- National Nature Science Foundation of China [21074044, 51101073]
- Special Fund for Basic Scientific Research of Central Colleges [201103088]
- Doctoral Program of Higher Education of China [20110061120019]
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A cross-linked network is obtained by an end-group cross-linkable PBI (E-PBI) and 4,4'-diglycidyl (3,3',5,5'-tetramethylbiphenyl) epoxy resin (TMBP). The formation of the network is proved by FT-IR and gel fraction test. Then, high temperature proton exchange membranes are constructed by incorporating the cross-linked network into poly(2,2'-(1,3-phenylene)-5,5'-bibenzimidazole) (m-PBI). The influences of the end-group cross-linked network on the properties of membranes are studied, such as, phosphonate acid doping ability, thermal stability, mechanical property, oxidative stability and proton conductivity. The E-PBI/TMBP in the membranes contributes to the improvement of acid doping ability, proton conductivity, mechanical properties and oxidative stabilities. The blend membranes with 20-90 wt% E-PBI/TMBP show higher proton conductivity than pristine PBI at 120 degrees C-180 degrees C. These results indicate that the end-group cross-linked blend membranes are promising materials as high temperature proton exchange membranes. (c) 2012 Elsevier B.V. All rights reserved.
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