## Abstract Several types of SiO~2~‐supported metallocene catalysts were prepared using chemically modified silica gel. Polymerization of propene was conducted with these catalysts combined with methylaluminoxane (MAO) or ordinary alkylaluminiums. Highly isotactic poly(propylene) with high molecula
On the interaction of supported zirconocene catalysts with alkylaluminium co-catalysts
✍ Scribed by Nina V. Semikolenova; Vladimir A. Zakharov
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 472 KB
- Volume
- 198
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
The interaction of supported metallocene catalysts with methylaluminoxane leads to the desorption of the metallocene compound from the surface of the support and the formation of highly active homogeneous complexes. The catalytic properties of the system and characteristics of polyethylene formed are determined by these species.
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## Abstract A supported version of zirconocene catalysts on siloxane copolymers having 1,2,3,4‐tetramethylcyclopentadienyl (Cp″)‐fluorenyl (Flu) (I) or cyclopentadienyl (Cp)‐fluorenyl (II) groups as substituents was prepared and applied to propene polymerization using methylalumoxane (MAO) or [Ph~3
## Abstract Polysiloxanes with bisindenyl, bisfluorenyl, and bis(1,2,3,4‐tetramethyl)cyclopentadienyl side groups were synthesized by condensation of the corresponding dichlorosilane compounds and water to obtain supported ziroconocene catalysts. The polymerization of ethene was conducted over thes
## Abstract Both propene polymerization and ethylene/propene copolymerization were conducted with an Al~2~O~3~‐supported CpTiCl~3~ (Cp: cyclopentadienyl) catalyst using a common alkylaluminium as cocatalyst. The catalyst system gave atactic polypropene with frequently inverted propene units which a