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Vinyl-type polymerization of norbornene has been carried out with half-titanocene/MAO catalysts. It was found that the Cp(cyclopentadienyl)-bearing titanocene catalysts afford the polynorbornene at much higher yield than the related Cp~(pentamethylcyclopentadienyl)-bearing one. On the other hand, substitution of —OR ligand for chlorine at the Cp-bearing compound causes remarkbaly increase in catalytic activity. The optimum temperature for the polymerization is 60 ℃. All the polynorbornenes obtained with CpTi(OCH_2Ph)_3/MAO catalyst are soluble in the organic solvents such as cyclohexane and monochlorobenzene. The FTIR and ~13C NMR spectra indicate that the polynorbornene obtained is vinyl-type polymer and has low stereo-regularity.
Vinyl-type polymerization of norbornene has been carried out with half-titanocene / MAO catalysts. It was found that the Cp (cyclopentadienyl) -bearing titanocene catalysts afford the polynorbornene at much higher yield than the related Cp- (pentamethylcyclopentadienyl) -bearing one. The optimum temperature for the polymerization is 60 ° C. All the polynorbornenes obtained with CpTi (OCH_2Ph) _3 / MAO catalyst are soluble in the organic solvents such as cyclohexane and monochlorobenzene. The FTIR and ~ 13C NMR spectra indicate that the polynorbornene was vinyl-type polymer and has low stereo-regularity.