Abstract
The electrical conductivity of poly(vinyl chloride)-poly(1,3-propylene phosphate) membranes was measured as a function of ionic polymer content and its ionic state. The results are discussed by applying the percolation conductivity theory and considering the conformational transition upon neutralization of PPP. It was found that the critical volume fraction of PPP in membranes of 0.06 did not depend on an ionic form of polymer. A critical exponent ( t) predicted by the percolation theory was found to be 1.64 for the membrane in its sodium form and 1.04 in its hydrogen form. The value t = 1.04 is below the theoretical value of t, i.e. 1.6 ± 0.2, for conductor/insulator systems. This effect may result from the reduced conductivity of PPP after the transition from extended coil to the hypercoiled state in the ionic polymer.
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