Abstract
The kinetics of 1-octene polymerization by the catalyst systems VO(acac) 2-AlEt 3 (I) and VO(acac) 2-AlEt 2Br (II) was investigated. A linear dependence of the rate of polymerization on the monomer and catalyst concentrations as well as the overall activation energy of 44.5 kJ/mol for both the catalyst systems was found. The dependence of the rate of polymerization on aluminium alkyl concentration is explained by Langmuir-Hinshelwood adsorption of the monomer and the aluminium alkyl. Characterization of the structure of the polymer by 13C-NMR spectra revealed the isotactic content. The mechanism of polymerization is discussed in relation to the kinetic data obtained.
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