Abstract
Characterization and electrical properties of undoped cis -polyacetylene and annealed polyacetylene were studied by measuring the electrical conductivities, the rate of isomerization, the cis-trans content, wide angle X-ray diffraction (WAXD) and electron spin resonance(ESR). In cis -polyacetylene the electrical conductivity decrease with a decrease in the amount of residual catalysts. The electrical conductivity decrease with excess heating since the interchain cross-linking of the radicals was occurred, which also induced a decrease of crystallinity. The activation energy of cis-trans isomerization increased with an increase in the trans content. The crystal transition during the isomerization occurred following a certain amount of cis-trans isomerization in the polyacetylene chain. Two crystal structures were found in trans -polyacetylene. Secondary battery using polyacetylene as a cathode was also studied. The charge and discharge capability was improved by the decrease of residual catalyst.
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