Synthesis and proton conductivity of partially sulfonated poly([vinylidene difluoride-co-hexafluoropropylene]-b-styrene) block copolymers

摘要: A series of novel, amphiphilic block copolymers comprising sulfonated poly([vinylidene difluoride-co-hexafluoropropylene]-b-styrene) [P(VDF-co-HFP)-b-SPS] were synthesized. The number-average molecular weights the fluorous and polystyrene segments 17 900 8100 g/mol, respectively. Sulfonation segment to different extents provided a polymers which cast into films yield proton exchange membranes with varying ion capacity (IEC). Proton conductivity increased significantly when IEC was from 0.5 1.2 mmol/g. For 0.9−1.2 mmol/g membranes, similar Nafion 117, higher than random polystyrene, twice that nonfluorous copolymer based on poly(styrene-b-[ethylene-co-butylene]-b-styrene) (S-SEBS) hydrogenated poly(butadiene-b-styrene) (S-HPBS) copolymers. TEM revealed disruption in ordered morphol...