NMR studies on the mechanism of polymerization of cyclic olefins by a molybdenum catalyst
β Scribed by Jay A. Johnston; Peter L. Rinaldi; Michael F. Farona
- Publisher
- Elsevier Science
- Year
- 1992
- Weight
- 638 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0304-5102
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π SIMILAR VOLUMES
A mechanistic study has been carried out on the homogeneous olefin polymerizationroligomerization catalyst formed Ε½ . from Cp ZrMe and methylaluminoxane, MeAlO , in toluene. Formal transfer of CH from Zr to Al yields low 2 2 x 3 q wΕ½ .Ε½ . x concentrations of Cp ZrMe solvated by Me AlO MeAlO . The ca
The polymerization of cyclic olefins may be initiated by tungsten hexachloride alone. The rate of polymerization is less than that normally obtained with bimetallic catalysts but the equilibrium conversion monomer is of the same order.
## Abstract Ethylene polymerizations and norbornene oligomerizations catalysed by Cp~2~Ti^13^CH~3~Cl/MAO (Cp: cyclopentadienyl; MAO: methylaluminoxane) mixtures have been carried out at different temperatures (from β20Β°C to 20Β°C), in order to test the validity of carbene mechanisms in Ξ±βolefin poly
There is further consideration of the model of the active site of polymerization on heterogeneous Ziegler-Natta catalysts. It is located on basal planes of lattice crystals of type a-TiCl3 or VCI3 and has two vacancies at the transition metal atom. One of these vacancies is blocked by the helical po