Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 480, Issue -, Pages 83-92Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2014.12.014
Keywords
Crosslinking; Sulfonated polyimide; Proton conductivity; Dimensional stability
Categories
Funding
- National Natural Science Foundation of China [51173062, 50803025, 51203172]
- Science and Technology Development Plan of Jilin Province [20130521003JH, 20140204016GX]
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A series of pendant-group cross-linkable sulfonatecl co-polyimides (SPIs) with high degree of sulfonation were synthesized via a one-pot poly-condensation reaction from 1,3-bis(2-trifluoromethyl-4-aminophenoxy)-5-(2,3,5,6-tetrafluoro-4-vinylphenoxy)benzene (6FTFPB), 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene (6FAPB), 4,4'-diamindodiphenyl ether-2,2'-disulfonic acid (ODADS) and 1,4,5,8-naphthalene tetracarboxylic dianhydride (NTDA). Tough and flexible membranes were obtained from the SPIs by a solvent casting method. The cross-linking reaction of the pendant tetrafluorostyrol groups in the SPIs was performed at 260 degrees C. During the thermal treatment, no loss of the sulfonic acid groups was observed. The performance of the membranes was significantly enhanced after curing reaction. For instance, the proton conductivity, water uptake, swelling ratio and methanol permeability of the Cured-SPI-20 at room temperature were 85 mS cm(-1), 33.3%, 8.9% and 4.93 x 10(-7) CM2 s(-1), respectively. Moreover, the cross-linked membranes also exhibited improved chemical resistance, oxidative stability and mechanical property. This investigation demonstrates that the pendant cross-linked polyimide membranes with high degree of sulfonation may be promising for proton exchange membrane fuel cell technology. (C) 2014 Elsevier BM. All rights reserved.
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