Superactive and stereospecific catalysts. II. Kinetics of propylene polymerizations
- 1 October 1988
- journal article
- research article
- Published by Wiley in Journal of Polymer Science Part A: Polymer Chemistry
- Vol. 26 (11) , 2973-2989
- https://doi.org/10.1002/pola.1988.080261109
Abstract
The kinetics of propylene polymerization by superactive CH‐catalyst prepared from toluene solution of MgCl2 · EH/PA/TiCl4–TEA/PES was investigated. The results are compared with CW‐catalyst prepared from crystalline MgCl2/EB/PC/TEA/TiCl4–TEA/MPT (abbreviations given in the text). The former is four times more active than the latter and produces more isotactic polypropylene. The CH‐catalyst has 25% of the Ti as isospecific sites as compared to 6.7% for the CW‐catalysts. These sites have the same rate constant of propagation so that the higher polymerization activity of the CH‐catalyst is attributable simply to a greater number of active sites. Differences in the kinetics of deactivation and of chain transfer for the two catalysts are described.Keywords
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