Abstract
The cyclopolymerization of two dipropargyl monomers having different functionality (diethyl dipropargylmalonate, triethyl dipropargylphosphoneacetate) was carried out by molybdenum (V) chloride catalyst system in chlorobenzene at 60°C. The polymerizations were well proceeded to give a high polymer yield (85–98%). The number average molecular weights (An of poymers were in the range of 46000–97000. These polymers were completely soluble in aromatic and halogenated hydrocarbon solvents and easily casted into a homogeneous polymer film. Various instrumental analyses such as NMR (1H- and 13C-), IR, GPC, and UV-visible spectroscopies indicated that the present polymers have a highly conjugated polymer backbone structure. The tensile strength and failure strain of polymer film generally increased as the feed ratio of diethyl dipropargylmalonate in copolymer increased. On the other hand, the char yield of polymers increased significanly as the feed ratio of triethyl dipro-pargylphosphonoacetate in copolymer increased.
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