Journal
HIGH PERFORMANCE POLYMERS
Volume 30, Issue 1, Pages 3-15Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0954008316673703
Keywords
Hyperbranched polymer; polyimide; proton exchange membrane
Categories
Funding
- National Basic Research Program of China [2014CB643600]
- Shanghai Municipal Natural Science Foundation [13ZR1420200]
- Exploratory Bilateral Co-operation Programme SJTU-KU Leuven
- Special Fund of Shanghai Qingpu District-Shanghai Jiao Tong University Co-operation Programme
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A novel six-membered ring hyperbranched polyimide (HBPI) has been synthesized by condensation polymerization of a difunctional monomer, 9,9-fluorenylidenebis(4,1-phenylene)bis(oxy)-4,4-bis(1,8-naphthalic anhydride) (FBPNA), and a trifunctional monomer, tris(4-aminophenyl)amine (TAPA), at the molar ratio of FBPNA/TAPA = 1:1 in m-cresol at 180 degrees C for 20 h. The resultant HBPI is further modified via end-capping reaction with 4-phenoxy-1,8-anhydride naphthalene (PNA). Post-sulfonation is performed in concentrated sulfuric acid at different temperatures (50, 60, and 70 degrees C) for the pristine HBPI and 50 degrees C for the PNA-modified polyimides to give various sulfonated HBPIs. Freestanding and tough membranes have been successfully fabricated by casting the polymer solutions containing a cross-linker, bisphenol A epoxy resin, at 80 degrees C. The ion exchange capacities of the resultant membranes are in the range of 1.35-2.21 meq g(-1) depending on the degree of chemical modification and the sulfonation conditions. Membrane properties such as water uptake, swelling ratio, proton conductivity, and radical oxidative stability are investigated.
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