Russian Chemical Bulletin

, Volume 47, Issue 8, pp 1491–1497 | Cite as

Effect of substituents on the catalytic properties of bis(cyclopentadienyl) zirconocene dichlorides in polymerization of ethene

  • N. M. Bravaya
  • V. V. Strelets
  • Z. M. Dzhabieva
  • O. N. Babkina
  • V. P. Maryin
Physical Chemistry


Comparative analysis of catalytic activity of substituted bis(cyclopentadienyl)zirconium dichlorides with the general formula (R n Cp)2ZrCl2 (Cp2ZrCl2, (MeCp)2ZrCl2, (PriCp)2ZrCl2, (Pri 2Cp)2ZrCl2, (BunCp)2ZrCl2, (BuiCp)2ZrCl2, (ButCp)2ZrCl2, Cp* 2ZrCl2 (Cp*=Me5C5), (Me3SiCp)2ZrCl2, (cyclo-C6H11Cp)2ZrCl2, and [(cyclo-C6H11)2Cp]2ZrCl2) in ethene polymerization using polymethylalumoxane as the cocatalyst was performed. The molecular mass characteristics of the polyethylene samples obtained were determined. A linear correlation of the specific activity of the catalysts and the turnover number with the electronic and steric characteristics of substituents at the Cp ring of the complexes was established for the first time. Analysis of the polymerization kinetics and the obtained correlation between the specific activity of the complexes and molecular mass characteristics of the polyethylene samples suggest that alkyl substituents participate in reactions responsible for the restriction of the polymer chain growth and regeneration of the active center. These interactions most likely involve associates of AlMe3 with polymethylalumoxane molecules.

Key words

metallocene complexes bis(cyclopentadienyl)zirconium dichlorides effect of substituents ethene polymerization 


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Copyright information

© Plenum Publishing Corporation 1998

Authors and Affiliations

  • N. M. Bravaya
    • 1
  • V. V. Strelets
    • 1
  • Z. M. Dzhabieva
    • 1
  • O. N. Babkina
    • 1
  • V. P. Maryin
    • 1
  1. 1.Institute of Chemical Physics in ChernogolovkaRussian Academy of SciencesChernogolovkaRussian Federation

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