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- Title
燃料电池用新型磺化聚苯并咪唑交联膜的制备与性能.
- Authors
童晶晶; 房建华; 郭晓霞; 应黎彬
- Abstract
A tetraamine monomer, 4,4′-bis(3,4-diaminophenoxy)biphenyl (BDAPB),was randomly copolymerized with two other monomers of dicarboxylic, 4,4′-dicarboxyldiphenyl ether (DCDPE), and tetraamine, 3,3′-diaminobenzidine (DAB) in Eaton′s reagent(the mass ratio of methanesulfonic acid to phosphorus pentoxide was 10∶1) yielding a series of polybenzimidazole copolymers (PBI-x, x referred to the molar fraction of BDAPB in the tetraamine monomers). The resulting PBI-x was further post-sulfonated and subsequently covalently cross-linked (cross-linker: bisphenol A epoxy resin) to give a series of covalently cross-linked sulfonated polybenzimidazole copolymer membranes (S-PBI-x-Cy, here, y referred to the molar ratio of epoxy groups to benzimidazole groups). The thermal stability, mechanical properties, water uptake, swelling ratio, proton conductivity, radical stability and single cell performance of the exchange proton membranes were investigated. The prepared cross-linked membranes exhibited good mechanical properties. With an increase in molar fraction of BDAPB moiety, the proton conductivities of the membranes was increased remarkably. As the molar fraction of BDAPB reached 30%, its proton conductivity was higher than that of Nafion 212. The covalent cross-linking treatment led to reduction in membrane swelling ratio, and the higher cross-linking density, the more significant reduction in swelling ratio. The single cell assembled with the S-PBI-30-C15 exhibited excellent performance (H2-O2), and its maximum output power density reached 1.11 W/cm2 at 90 °C and 70% relative humidity, which was higher than that of Nafion 212 (0.95 W/cm2) under the same conditions.
- Subjects
PROTON conductivity; MOLE fraction; EPOXY resins; PHOSPHORIC anhydride; MONOMERS; BENZIMIDAZOLES
- Publication
Journal of Functional Polymers, 2019, Vol 32, Issue 4, p463
- ISSN
1008-9357
- Publication type
Academic Journal
- DOI
10.14133/j.cnki.1008-9357.20181113001