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- W2045222363 abstract "Propylene polymerizations with rac-dimethylsilylbis(3-methylcyclopentadienyl)MCl (M = Ti, Zr, Hf) in combination with methylaluminoxane (MAO) were carried out to study the effect of the metal species on catalytic activity, stereoregularity, regioregularity, and molecular weight of poly(propylene). The rac-Me2Si(3-MeCp) 2 TiCl 2 /MA catalyst showed lowest activity among the three catalysts. The stereospecificity of the titanium based catalyst is very high and the portion of the mmmm pentads is roughly as high as for the zirconium and hafnium analogue. On the other hand, the regiospecificity of the titanium based catalyst is low and only the 1,3-regioirregular structure was observed, whereas the 2,1-regioirregular structure was detected in poly(propylene)s obtained with the zirconium and hafnium analogue. As a result, the melting point of poly(propylene) obtained with the titanium based catalyst is lower than that of poly(propylene) obtained with the zirconium or hafnium analogue. Addition of hydrogen with the titanium based catalyst gave rise to an increase in activity; but this accelerating effect was not observed in ethylene polymerization." @default.
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- W2045222363 date "1999-06-01" @default.
- W2045222363 modified "2023-09-23" @default.
- W2045222363 title "Propylene polymerization with dimethylsilylbis(3-methylcyclo-pentadienyl)MCl2 [M = Ti, Zr, Hf] in combination with methylaluminoxane" @default.
- W2045222363 doi "https://doi.org/10.1002/(sici)1521-3935(19990601)200:6<1356::aid-macp1356>3.0.co;2-v" @default.
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