Percolation effects in ion-exchange materials

The dependence of conductivity kappa (m) of homogeneous and heterogeneous i on-exchange materials on the volume fraction of a conducting hydrophilic ph ase f was studied. Approaches of the percolation theory were used to analyz e the data obtained. Parameters appearing in the percolation equation kappa (m) = kappa (o)(f-f(cr))' were determined for the description of the condu ctivity behavior during water. desorption front heterogeneous ion exchange membranes, and in the preparation of various polymeric compositions from a conducting component distributed in the nonconducting medium. The obtained values of the critical exponent t agree with the theoretical value (t = 1.6 +/- 0.4) for all the materials studied. The dependence of the percolation threshold f(cr) on the structural organization of ion-exchange materials wa s determined.