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Substituted polyacetylenes have received considerable attention, owing to their properties resulting from the π-conjugated
backbone such as photoconductivity and electroluminescence. The introduction of functional groups at the side chains
provides polyacetylenes with useful structural features including liquid crystallinity, molecular recognition, stimuliresponsiveness
and gas permeability. Substituted polyacetylenes are synthesized by the polymerization of the corresponding
acetylene monomers using transition-metal catalysts. Rh catalysts bearing a triphenylvinyl group polymerize substituted
acetylene monomers in a living fashion to give polymers with controlled molecular weights, geometry and end structures.
Pd catalysts bearing bulky phosphine ligands polymerize disubstituted acetylene monomers via the coordination-insertion
mechanism. Substituted polyacetylenes bearing chiral substituents adopt helical conformations, whose predominant screw
sense transforms between right and left-handed in CHCl3/MeOH with respect to the solvent composition. The polymers prefer
conformations with large dipole moments in polar media, confirmed by the semi empirical molecular orbital calculations,
Fumio Sanda is a professor in Kansai University. His research studies includes Polymer Synthesis, Transition Metal Catalyzed Polymerization, Conjugated Polymers, Optically Active Polymers. He has received Nakamura award in the year 1997 and Award of Japan Thermosetting Plastics in 2014 and many more.