CYCLOPOLYMERIZATION OF DIETHYL DIPROPARGYLMALONATE AND TRIETHYL DIPROPARGYLPHOSPHONOACETATE BY MOLYBDENUM PENTACHLORIDE

The cyclopolymerization of two dipropargyl, monomers having different functionality (diethyl dipropargylmalonate, triethyl dipropargylphosph oneacetate) was carried out by molybdenum (V) chloride catalyst system in chlorobenzene at 60 degrees C. The polymerizations were well proce eded to give a high polymer yield (85-98%). The number average molecul ar weights (Mn of polymers were in the range of 46000-97000. These pol ymers were completely soluble in aromatic and halogenated hydrocarbon solvents and easily casted into a homogeneous polymer film. Various in strumental analyses such as NMR (H-1- and C-13-), IR, GPC, and UV-visi ble spectroscopies indicated that the present polymers have a highly c onjugated polymer backbone structure. The tensile strength and failure strain of polymer film generally increased as the feed ratio of dieth yl dipropargylmalonate in copolymer increased. On the other hand, the char yield of polymers increased significanly as the feed ratio of tri ethyl dipro-pargylphosphonoacetate in copolymer increased.