Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 133, Issue 46, Pages -Publisher
WILEY-BLACKWELL
DOI: 10.1002/app.44218
Keywords
batteries and fuel cells; conducting polymers; crosslinking; membranes; polyelectrolytes
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Funding
- MEXT program for Development of Environmental Technology using Nanotechnology from Ministry of Education, Culture, Sports, Science and Technology, Japan
- Grants-in-Aid for Scientific Research [26289254] Funding Source: KAKEN
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The synthesis and characterization of crosslinked aromatic polymer membranes with high ion exchange capacity (IEC) values are reported. Through aromatic nucleophilic substitution polycondensation and the subsequent sulfonation reaction, the highly sulfonated polymers SPPSU-2S and SPPSU-4S with high molecular weight (M-n=138-145 kDa, M-w=200-279 kDa) and well-defined structures were synthesized. By solution casting and thermal annealing treatment, flexible crosslinked membranes with high solvent insolubility were obtained. The membranes exhibited mechanical and chemical stability as confirmed by dynamic mechanical analysis (DMA) and conductivity measurement. The crosslinked SPPSU-4S membrane with IEC=3.20 meq/g showed the highest proton conductivity of 0.163 S/cm at 120 degrees C, 90% RH, and improved thermal stability compared with its precursor (uncrosslinked) membrane. The results show that simple annealing method could improve significantly membranes properties of highly sulfonated aromatic polymers. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44218.
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