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Polymerization of propene with enantiomorphic site catalysts, 1. A statistical analysis
Author(s) -
Di Silvestro Giuseppe,
Sozzani Piero,
Terragni Alberto
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021971013
Subject(s) - propene , polymerization , tacticity , metallocene , polymer chemistry , monomer , chemistry , catalysis , solvent , polymer , organic chemistry
Recently we proposed a stereochemical classification of stereorigid metallocene catalysts according to their symmetry; statistical models of increasing complexity for the polymerization of propene based on the alternating mechanism have been developed. The general model agrees with the alternating mechanism and accounts for the most important stereochemical error (skipped insertion) and for the effect of the solvent and of polymerization temperature. Analysis of literature data of pentad concentrations for syndiotactic polypropylenes shows that the skipped insertion is more probable at high polymerization temperature, at low monomer pressure and in polar solvents.