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W. Skupiński, K. Niciński

The effect of the number and nature of phenoxy group substituents on the activity and selectivity

of CpTiCl3-n(OC6H5-mXm)n/MAO catalyst systems in syndiotactic polymerization of styrene

Polimery 2002, No 1, 30


Summary

Styrene was polymerized oyer hemititanocene catalysts CpTiCl3-nYn (where Y = OC6H5-mXm; X = Me, i-Pr, t-Bu or Cl; n = 1—3; m = 1—3) activated with methylaluminoxane (MAO). Catalyst structure modifications allowed to follow the effect of steric factors and of the electron donor-acceptor properties of phenoxy ligands on the yield and selectivity of syndiotactic polymerization of styrene (Table 1). The interpretation uses Scheme 1 which shows the mechanisms believed to underlie the formation of active centers and the reaction of propagation of the polymerization.


Keywords: syndiotactic polymerization of styrene, hemititanocene catalysts, substitution of ligands, index of syndiotacticity


W. Skupiński, K. Niciński (1.51 MB)
The effect of the number and nature of phenoxy group substituents on the activity and selectivity of CpTiCl3-n(OC6H5-mXm)n/MAO catalyst systems in syndiotactic polymerization of styrene