Synthesis and transport properties of proton-conducting membranes based on polyvinylidene fluoride films with introduced and sulfonated polystyrene |
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Authors: | E. F. Abdrashitov V. Ch. Bokun D. A. Kritskaya E. A. Sanginov A. N. Ponomarev Yu. A. Dobrovol’skii |
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Affiliation: | 1.The Branch of Institute of Energy Problems of Chemical Physics,Moscow oblast, Chernogolovka,Russia;2.Institute of the Problems of Chemical Physics,Russian Academy of Sciences,Chernogolovka,Russia |
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Abstract: | Thermal polymerization of styrene sorbed into a polyvinylidene fluoride (PVdF) film from a toluene solution followed by sulfonation of the resulting material was performed. The kinetics of polystyrene (PS) accumulation in the PVdF film during thermal polymerization was studied. Samples with 6–30 wt % PS and ∼100% PS sulfonation were obtained. Proton-exchange membranes wsith an ion-exchange capacity of up to 2 mg-eq/g and proton conductivity of up to 0.008 S/cm at 75% relative humidity were prepared. The permeability coefficients of water, methanol, and hydrogen and their dependences on the amount of introduced PS, ion-exchange capacity, and water uptake of membranes were measured. The synthesized materials proved similar to MF-4SK membranes in their basic transport characteristics and can be used as proton-exchange membranes in hydrogen-air and alcohol fuel cells. |
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