Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 35, Issue 6, Pages 2436-2445Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2009.12.137
Keywords
Hexafluoroisopropylidene; Poly(arylene thioether phosphine oxide)s; Proton exchange membrane; Sulfonated
Categories
Funding
- National Natural Science Foundation of China [50303010, 50633010, 50973061]
- National Basic Research Program [2007CB808000, 2009CB930400]
- Shanghai Leading Academic Discipline Project [B202]
- Science and Technology Committee of Shanghai municipality [065207065]
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A series of novel sulfonated poly(arylene thioether phosphine oxide)s with hexafluoroisopropylidene moieties (sPTPOF) were prepared by polycondensation of sulfonated bis(4-fluorophenyl)phenyl phosphine oxide and bis(4-fluorophenyl)phenyl phosphine oxide with 4,4'-(hexafluoroisopropylidene) diphenthiol. The incorporation of hexafluoroisopropylidene moieties to the resulting polymers is effective to increase the hydrophobicity of non-sulfonated segments and to decrease the swelling while maintaining high proton conductivity. For instance, sPTPOF-100 showed a proton conductivity of 0.090 S/cm as well as a swelling of 5.3% at 80 degrees C. In addition, the sPTPOF polymers exhibited excellent thermal properties and oxidative stability. AFM phase images illustrated that the sPTPOF membranes show a special nanophase-separated morphology, namely, the connectivity of ionic channels increased obviously but their width only slightly increased with increasing sulfonation degree. This special microstructure is favorable for promoting proton transport and restraining the swelling. The sPTPOF polymers are a promising material for proton exchange membranes. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
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