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The stereospecific mechanism of olefin polymerization by heterogeneous complex catalysts—II. The model of the stereospecific polymerization site

✍ Scribed by Yu.V. Kissin; N.M. Chirkov

Publisher
Elsevier Science
Year
1970
Tongue
English
Weight
972 KB
Volume
6
Category
Article
ISSN
0014-3057

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✦ Synopsis

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 polymer chain and the other is available for olefin co-ordination. The study of the action of this model shows two types of stereospccific control over monomer co-ordination: by the growing helical polymer chain and by neighbouring transition metal atoms. Some kinetic aspects of olefin polymerization with preliminary co-ordination are discussed.

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✍ Incoronata Tritto; San Xi Li; Laura Boggioni; Maria Carmela Sacchi; Paolo Locate 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 747 KB

## 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 ‐20°C to 20°C), in order to test the validity of carbene mechanisms in α‐olefin poly