Title: Half-Titanocene-Based Catalysts in the Syndiospecific Polymerization of Styrenes: Possible Oxidation States of the Titanium Species and Geometries of the Active Sites
Abstract:Half-titanocenes (CpCH2CH2O)TiCl2 (1) and (CpCH2CH2OCH3)TiCl3 (2), (Cp = cyclopentadienyl), activated by methylaluminoxane (MAO), have been tested in the polymerization of styrene, p-methylstyrene, an...Half-titanocenes (CpCH2CH2O)TiCl2 (1) and (CpCH2CH2OCH3)TiCl3 (2), (Cp = cyclopentadienyl), activated by methylaluminoxane (MAO), have been tested in the polymerization of styrene, p-methylstyrene, and p-chlorostyrene. Both catalysts produce syndiotactic polystyrene and poly-p-methylstyrene in the whole range of explored temperatures and concentrations. In the polymerization of p-chlorostyrene, however, catalyst 1 affords a syndiotactic polymer only at the low temperature and the high monomer concentrations; and catalyst 2 gives only an atactic product. The results have been compared to those obtained in the presence of the catalytic system CpTiCl3 (3)/MAO and have been discussed considering the possible oxidation states of the titanium species and the geometries of the active sites.Read More
Publication Year: 2009
Publication Date: 2009-03-16
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 15
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