Аннотация:Significant increase of ion selectivity has been observed for Nafion membranes modified bypoly(diallyldimethylammonium chloride) (PDADMAC) in the presence of lower aliphatic alcohols andNaCl. It has been found that addition of the salt into the alcohol-containing modification solutions resultsnot only in decrease of diffusional permeability towards vanadyl ions P but also in simultaneous two- to threefoldgrowth of proton conductivity σ in comparison with the membranes modified in the alcohol-water solutionsin the absence of the salt. As a result, ion selectivity of the membranes calculated as σ/P ratio has beenincreased in ∼4 orders of magnitude as compared with pristine Nafion 112 membrane. Conceivable mechanismof the ion selectivity increasing is proposed for the membranes modified by PDADMAC in the presenceof lower aliphatic alcohols and NaCl.
