|M.Sc Student||Alexandra Liobine|
|Subject||Synthesis, Characterization and Catalytic Activity of|
Imidazolin-2-Iminato Zirconium Complexes
|Department||Department of Chemistry||Supervisor||Full Professor Eisen Moris|
Half metallocenes bearing one Cp ligand on early transition metals have been found to display a high catalytic activity; in addition, they also allow efficient copolymerization, and the synthesis of longer polymer chains. These properties can be further tuned by replacing the Cp ligand with an analog such as the imidazoline-2-iminato ligand. The Ti complexes that bearing the imidazolin-2-iminato ligand exhibited some interesting polymerization properties. That is why the polymerization abilities of their Zr analogs was the aim of this research.
This work consists of two parts. The first part presents the preparation and characterization of the complexes 1,3-di-(tert-butyl)imidazolin-2-iminato zirconium tribenzyl, 1,3-di-(2,6-diisopropylphenyl)imidazolin-2-iminato zirconium tribenzyl, 1,3-di-(2,4,6-trimethylphenyl)imidazolin-2-iminato zirconium tribenzyl, bis(1,3-di-tert-butylimidazolin-2-iminato) zirconium dibenzyl, bis(1,3-di-(2,4,6-trimethylphenyl)imidazolin-2-iminato) zirconium dibenzyl, (butylated hydroxy toluene) (1,3-di-tert-butylimidazolin-2-iminato) zirconium dibenzyl and (2,6-di-tert-butylphenol) (1,3-di-tert-butylimidazolin-2-iminato) zirconium dibenzyl.
The second part of the work was focused on finding the optimal polymerization conditions for ethylene, propylene and 1-hexene polymerization. The effects that were tested including the two types of cocatalyst such as MAO and TIBA/TTPB has on polymerization reaction, the different ratios between catalyst and cocatalyst, the effect of monomer pressure, the effect of time on polymerization.