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• W2000700650 abstract "A series of branched/crosslinked sulfonated polyimide (B/C-SPI) membranes were prepared and evaluated as proton-conducting ionomers based on the new concept of in situ crosslinking from sulfonated polyimide (SPI) oligomers and triamine monomers. Chemical branching and crosslinking in SPI oligomers with 1,3,5-tris(4-aminophenoxy)benzene as a crosslinker gave the polymer membranes very good water stability and mechanical properties under an accelerated aging treatment in water at 130 °C, despite their high ion-exchange capacity (2.2–2.6 mequiv g−1). The resulting polymer electrolytes displayed high proton conductivities of 0.2–0.3 S cm−1 at 120 °C in water and reasonably high conductivities of 0.02–0.03 S cm−1 at 50% relative humidity. In a single H2/O2 fuel-cell system at 90 °C, they exhibited high fuel-cell performances comparable to those of Nafion 112. The B/C-SPI membranes also displayed good performances in a direct methanol fuel cell with methanol concentrations as high as 50 wt % that were superior to those of Nafion 112. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 3751–3762, 2006" @default.
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• W2000700650 date "2006-01-01" @default.
• W2000700650 modified "2023-10-01" @default.
• W2000700650 title "Chemically modified proton-conducting membranes based on sulfonated polyimides: Improved water stability and fuel-cell performance" @default.
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• W2000700650 doi "https://doi.org/10.1002/pola.21477" @default.
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