| Abstract
| - Two series of polyacetylenes containing 4-alkanyloxyphenyl trans-4-n-alkylcyclohexanoatewere synthesized using [Rh(nbd)Cl]2, MoCl5, and WCl6 as initiators. Polymers 1P−3P, which contain noflexible spacer, show no mesomorphic properties due to the rigid poly(phenylacetylene) backbone. Polymers4P−9P, which contain three or four methylene units in their spacers, exhibit both SA and Sc phases.X-ray diffraction diagrams reveal that the liquid crystalline polyacetylenes display an interdigitated bilayerstructure for the smectic phases. Polymers 4P−9P are photoluminescent, and their emission wavelengthsare about 500 nm. The photoluminescence intensity increased dramatically when a liquid crystallinepolyacetylene was blended with poly(methyl methacrylate).
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