Modification of Proton Exchange Membrane by"Swelling-Filling"Method to Macromolecular Nano-Pore Structure
We adopt"swelling-filling"method to modity composite membrane with a proton conductive macromolecular nano-particle as SF filler to improve the performance of proton exchange membrane effectively.We achieved swelling-filling of the microporous structure in polyvinylidene fluoride membrane by controlling the swelling time of the polyvinylidene fluoride membrane in the hyperbranched polyamide solution.We prepared three different proton exchange membranes by three swelling times of 1 h,3 h and 5 h.Then measured the proton conductivity,water absorption,swelling,ion exchange capacity,mechanical properties,oxidation resistance and thermodynamic stability of the proton exchange membrane.The three composite proton exchange membranes showed good mechanical properties,oxidation stability and thermal stability.The tensile strength of PVDF-HBM-2 was 47.18 MPa and the oxidation stability was 99.15%.The three composite membranes began to decompose at about 400℃,which was suitable for the working temperature range of the Proton exchange membrane fuel cell.Great thermal and mechanical stability of the PVDF-HBM-x membrane indicates the potential for long-term operation in fuel cells.
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