DEPENDENCE OF THE ELECTROTRANSPORT PROPERTIES OF POLYARYLENE SULFAMIDE MEMBRANES ON THEIR CHEMICAL-COMPOSITION AND CONCENTRATION OF EQUILIBRIUM ELECTROLYTE-SOLUTIONS

The electrotransport characteristics of homogeneous polyamide membrane s are studied as a function of the content of poly-m-phenyleneisophtha lamide (Phenylone) in the polymer. The most significant chan ges in th e transport properties are found to occur after the molar fraction of Phenylone in the samples is increased from 0 to 30%. A further increas e in the fraction of the inert binder in the membranes (40-60 mol %) m akes no considerable impact on the electrotransport characteristics. T he concentration dependences of specific electroconductivity kappa, di ffusion permeability Rho and electroosmotic permeability t(w) of the m embranes in aqueous sodium chloride solutions are obtained in a wide c oncentration range. The nature of the concentration dependences of Rho and kappa is shown to undergo a change with the growing molar fractio n of Phenylone. The results obtained are compared to similar dependenc es for homogeneous perfluorinated sulfocationite membranes with close values of exchange capacity and specific moisture content. According t o the experimental data, electrochemical properties of homogeneous pol y(arylene sulfamide) membranes can be finely adjusted by the changing structure of transport channels in the polymer.