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The paper describes the processes of water adsorption and desorption in a model hydrated acidic polymer, sulfonated and silylated poly-ether-ether-ketone (SOSiPEEK). Water uptake/loss experiments are carried out under conditions, where no membrane swelling occurs. The isotherms are described by analytical equations, inferred assuming that the surface of the membrane is uniformly covered by adsorbed...
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