Synthesis and olefin polymerization using supported and non-supported geometry constrained titanium complexes

Mercedes Galan-Fereres*, Thomas Koch, Evamarie Hey-Hawkins, Moris S. Eisen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

The synthesis of a constrained geometry titanium complex and its immobilization on different supports have been studied for the catalytic polymerization of ethylene, propylene and styrene. The formation of higher molecular weight polymers was found in the heterogeneous system as compared to the homogenous parent for polyethylene and polypropylene. Polymerization of propylene yielded atactic products with elastomeric properties due to long polymer chains. However, syndiotactic polymers were formed in the polymerization of styrene. Catalytic activity was found to be dependent on MAO and titanium concentration; the higher the metal concentration the lower the activity of the catalyst. The activity of the heterogeneous system was determined as a function of time, and a first-order deactivation pathway was found at room temperature. The type of solvent (toluene or CH2Cl2) also played an important role in the polymerization of ethylene and styrene, although different tendencies were found for either monomers.

Original languageEnglish
Pages (from-to)145-155
Number of pages11
JournalJournal of Organometallic Chemistry
Volume580
Issue number1
DOIs
StatePublished - 15 May 1999
Externally publishedYes

Keywords

  • Geometry constrained catalysts
  • Heterogeneous Ziegler-Natta polymerization
  • Homogeneous Ziegler-Natta polymerization
  • Titanium complexes
  • α-Olefin polymerization

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