Strong-acid membranes with sulphonic groups prepared from PE/poly(St-co-DVB) interpolymers were used in an electrochemical process of ammonium peroxydisulphate production. The amount of the crosslinking agent (DVB) in poly(St-co/DVB) varied, namely it was equal to 0.5, 1 (commercial KESD-2 membrane) or 2 wt.%. The effect of a 400-h electrolysis process on the physicochemical properties (ion exchange capacity, swelling in water, resistivity, molar concentration of ionic groups) as well as on the mechanical properties (tensile strength and elongation at break) was determined. It was found that the most significant changes of properties exhibited membranes with the lowest (0.5 wt.%) DVB content. Membranes with 2 wt.% DVB were the most resistant to a prolonged exposure to process conditions. It was concluded that the interpolymer membranes with 2 wt.% DVB had the best electrochemical, and mechanical properties and they allowed to perform the electrolysis process with a 80% yield.
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