Studies on Polymerization of Norbornene with Titanocene/MAO Catalyst System

Abstract

Abstract: Vinyl-type polymerization of norbornene has been carried out with half-titanocene/MAOcatalysts. 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 —ORligand 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(OCH₂Ph)₃/MAOcatalyst are soluble in the organic solvents such as cyclohexane and monochlorobenzene. The FTIRand ¹³C NMRspectra indicate that the polynorbornene obtained is vinyl-type polymer and has low stereo-regularity.

Key words: Metallocene catalyst, Norbornene, Vinyl-type polymerization

CLC Number:

O631.1

TrendMD:

LU Ying-Ying, WU Qing, LU Ze-Jian . Studies on Polymerization of Norbornene with Titanocene/MAO Catalyst System[J]. Chem. J. Chinese Universities, 2001, 22(1): 160.

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Studies on Polymerization of Norbornene with Titanocene/MAO Catalyst System

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