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Fluorenyl-containing sulfonated poly(aryl ether ether ketone ketone)s (SPFEEKK) for fuel cell applications |
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| Authors: | Baijun Liu Dae-Sik Kim Jeffrey Murphy Gilles P. Robertson Michael D. Guiver Serguei Mikhailenko Serge Kaliaguine Yi-Ming Sun Ying-Ling Liu Juin-Yih Lai |
| Affiliation: | aInstitute for Chemical Process and Environmental Technology, National Research Council, Ottawa, Ont., Canada K1A 0R6 bChemical Engineering Department, Laval University, Ste-Foy, Que., Canada G1K 7P4 cDepartment of Chemical Engineering and Material Science, Yuan Ze University, Chung-Li, Taoyuan, Taiwan 320, People's Republic of China dResearch and Development Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan University, Chung-Li, Taoyuan, Taiwan 320, People's Republic of China |
| Abstract: | A series of fluorenyl-containing sulfonated poly(aryl ether ether ketone ketone)s (SPFEEKK) were synthesized via aromatic nucleophilic substitution polymerization. The sulfonation content (SC) was controlled by the feed ratios of sulfonated and nonsulfonated monomers. Flexible and strong membranes in the sulfonic acid form were obtained from cast membranes in the sodium salt forms by treatment with acid. The thermal properties, water uptake, swelling ratio, water state, oxidative stability, proton conductivity and methanol permeability were investigated. All the polymers had proton conductivities greater than 1 × 10−2 S/cm at room temperature, and the conductivity values of m-SPFEEKK-80 and p-SPFEEKK-80 were up to 1.86 × 10−1 and 1.78 × 10−1 S/cm at 100 °C. This series of polymers also possessed good dimensional stability in water and low methanol crossover. |
| Keywords: | Fuel cell Proton exchange membrane Sulfonation Poly(ether ketone)s Polymerization |
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