Abstract
Temperature dependences of the stereoregularity parameters of the most stereospecific active centres of α-TiCl 3-AlEt 3 catalytic system from −25 to 120 and of VCl 3-AlEt 3 catalytic system from −15° to 90° have been measured. It was found that this temperature dependence could be represented by a curve with a minimum at 20–50. The results could be explained by a two-step mechanism of isotactic chain growth (propagation) with preliminary co-ordination of monomer on the active centres.
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