ISSN:
0098-1273
Keywords:
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The 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.
Additional Material:
7 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1977.180150404
