Dependence of composition of anion-exchange membranes and their electricalconductivity on concentration of sodium salts of carbonic and phosphoric acids

Concentration dependencies of electrical conductivity of AFN, AMX, ACS and ACM anion-exchange membranes (from Tokuyama Soda), equilibrated with soluti ons of sodium salts of carbonic and phosphoric acids as well as with sodium sulfate solutions, are studied. Analysis of the data on electrolyte desorp tion from the membranes equilibrated initially with solutions of the weak-a cid salts as well as the application of the microheterogeneous model allowe d to explain the change of the conductivity with a concentration growth by the effect of two factors: ii) a change (an increase, in the most cases) of the conductivity of the electroneutral solution forming the membrane 'inte r-gel' phase, iii) a variation of the conductivity of the membrane 'gel' ph ase caused by hydrolysis reactions of the weak-acid anions in the pore solu tion. (C) 2001 Elsevier Science B.V. All rights reserved.