The main patterns of the hydration of sulfo groups, the translational mobility of water molecules, alkali metal cations, and ionic conductivity in sulfocation-exchange membranes (MSC) based on polyethylene and sulfonated grafted polystyrene have been investigated using NMR and impedance spectroscopy techniques. It has been shown that at moisture contents λ < 4 (λ is the number of water molecules per sulfo group) the H + counterions in the membranes form diaquahydrogen ionsIn the temperature range below 0°C at λ < 12, water molecules retain high mobility and do not form the ice phase. Water molecules diffusion coefficients (for the H + form, the average diffusion coefficient of water molecules and acidic protons) and first for ion-exchange systems, and the diffusion coefficients of counterions Li + , Na + , and Cs + have been measured by pulsed field gradient 1 H, 7 Li, 23 Na, and 133 Cs NMR spectroscopy. In MSC membranes in contact with water, the self-diffusion coefficients of cations increase in the Li + < Na + < Cs + series. The cation conductivity values are in the same Li + < Na + < Cs + H + sequence. The cation conductivity values calculated from the self-diffusion coefficients based on the Nernst-Einstein equation are essentially higher than the experimental values.
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