LOW-FREQUENCY ELECTRICAL-CONDUCTIVITY OF POLY(PHENYLACETYLENE)-IODINEIN TETRAHYDROFURAN SOLUTIONS - EFFECT OF IODINE CONCENTRATION

The electrical conductivity of poly(phenylacetylene)-iodine in tetrahy drofuran solution has been measured at the frequency of 10 kHz, in the temperature range from -15 to 40 degrees C as a function of iodine co ncentration. The data have been analysed on the basis of the counterio n fluctuation model developed for highly charged polyelectrolyte aqueo us solutions. The dependence of the electrical conductivity on the iod ine concentration suggests that the conduction mechanism is governed b y the interaction of the polymer with iodine molecules, resulting in a charge-transfer complex in solution, the effectiveness of which is ma ximum at some well-defined concentrations corresponding to six polymer units for each I-5(-) ion.