Abstract
Unoriented and stretch-oriented polyacetylene samples prepared via an improved Durham precursor polymer have been investigated. The standard catalysts for the Durham precursor polymerization have been replaced by a Schrock-type molybdenum-based initiator, which gives a narrower distribution in molecular weight and better stereoregularity in the precursor polymer. We have looked at the process of orientation achieved by stretching free-standing films during thermal conversion. Mixtures of high and lower molecular weight precursor polymers, giving a bimodal distribution, are more readily stretched than polymers with a monomodal molecular weight distribution, and we find that these oriented films show significantly higher levels of orientation and larger crystallite sizes than films prepared from the standard Durham-route precursor. Unoriented films of polyacetylene show optical absorption similar to those of the standard Durham polyacetylene, though there are significant differences in the photoinduced absorption spectra.
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