Revisiting the radical copolymerization of vinylidene fluoride with perfluoro-3,6-dioxa-4-methyl-7-octene sulfonyl fluoride for proton conducting membranes

摘要: Abstract The radical copolymerizations of vinylidene fluoride (VDF) with perfluoro-3,6-dioxa-4-methyl-7-octene sulfonyl (PFSVE) and hPFSVE (hydrolyzed form PFSVE) are presented. resulting poly(VDF-co-PFSVE) random copolymers were hydrolyzed then cast into proton conducting membranes. Another strategy was first to hydrolyze PFSVE under basic conditions, copolymerize it VDF. copolymerization VDF led homogeneous in contrast that hPFSVE, as assessed by 19F NMR spectroscopy. thermal electrochemical properties all determined. As expected, the stability bearing -SO2F groups higher than containing -SO3H moieties. Membranes processed casting displayed water uptake ca. 40%, ion exchange capacity 1.25 meq.g−1 conductivities up 28 mS cm−1 at 80 °C 100% relative humidity.