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A partially fluorinated polyether ionomer from polycondensation of decafluorobiphenyl with 2,2-bis(4-hydroxyphenyl)-hexafluoropropane, followed by sulphonation with H2SO4 (60% SO3), has been prepared and optimised in terms of molecular weight and sulphonation degree. The partially fluorinated ionomer has been blended with poly(2,2'-mphenylene-5,5'-bibenzimidazole) (PBI), yielding base-acid blends with PBI in excess. The base-acid blend membranes have been characterised in terms of solubility in DMAc, water uptake and oxidative stability by immersion in aqueous 5 wt.-% H2O2 solutions and Fenton's Reagent, respectively. Ionomers with molecular masses of up to 140,000 Da (non-sulphonated) and 178,000 Da (sulphonated) with excellent thermal stabilities and high sulphonation degrees of up to 2.06 SO3H groups per repeat unit have been produced. Their base-excess blend membranes, where the ionomer blend component served as acidic ionomeric cross-linker, showed excellent oxidative stabilities which were better than that of pure PBI and comparable to the oxidative stability of Nafion (R) in Fenton's Reagent.
Original languageEnglish
JournalFuel Cells
Publication date2008
Volume8
Issue3-4
Pages175-187
ISSN1615-6846
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 39

Keywords

  • partially fluorinated polyether, GPC, PBI, Fentons test, oxidative stability, sulfination, base-acid blend membrane
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