Abstract
AbstractThe dc conductivity of crystallizable poly(phenylacetylene), made in the presence of ferric acetylacetonate and triethylaluminum, and its dependence on time, temperature, pressure, and crystallinity was determined. A decrease in conductivity upon annealing is probably attributable to an irreversible conformational transformation of the polymer. There is also a reversible decrease in conductivity upon compression which, under some conditions, corresponds to a volume of activation as high as 70 cm3/mole. Upon complexing with iodine the conductivity is increased by several orders of magnitude and activation energies and volumes are greatly reduced, even at iodine concentrations as low as 1.6 mole % iodine per monomer unit. Although an identification of unpaired spins with the charge carriers is probably not justified, defect states, whose presence is demonstrated by electron spin resonance, may play a major role in the charge transport process. The strong reversible decrease of the conductivity with an increase in pressure is plausible, if intermolecular charge transport is the rate‐controlling step, an interpretation consistent with the large increase in conductivity upon complexing with small amounts of iodine.
Published Version
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