Controlling the ethylene polymerization parameters in iron pre-catalysts of the type 2-[1-(2,4-dibenzhydryl-6-methylphenylimino)ethyl]-6-[1-(arylimino)ethyl] pyridyliron dichloride

The ligand series 2-[1-(2,4-dibenzhydryl-6-methylphenylimino)ethyl]-6-[1-(arylimino)ethyl]pyridines and the iron(II) chloride complexes thereof have been synthesized and characterized by elemental and spectroscopic analyses. The molecular structures of C1 and C2, determined by single-crystal X-ray d...

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Bibliographic Details
Published in:Polymer (Guilford) 2012-01, Vol.53 (1), p.130-137
Main Authors: Zhao, Weizhen, Yu, Jiangang, Song, Shengju, Yang, Wenhong, Liu, Hao, Hao, Xiang, Redshaw, Carl, Sun, Wen-Hua
Format: Article
Language:English
Subjects:
Applied sciences
chemical structure
Diffraction
Ethylene
Ethylene polymerization
Exact sciences and technology
Iron
Iron pre-catalysts
Ligands
Linear polyethylene
molecular weight
Molecular weight distribution
Optimization
Organic polymers
Physicochemistry of polymers
polyethylene
Polyethylenes
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
pyridines
spectroscopy
X-ray diffraction
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Summary:The ligand series 2-[1-(2,4-dibenzhydryl-6-methylphenylimino)ethyl]-6-[1-(arylimino)ethyl]pyridines and the iron(II) chloride complexes thereof have been synthesized and characterized by elemental and spectroscopic analyses. The molecular structures of C1 and C2, determined by single-crystal X-ray diffraction analysis, confirmed a pseudo-square-pyramidal geometry at the iron center. Upon treatment with either MAO or MMAO, all iron pre-catalysts possessed good thermo-stability and exhibited high activities [up to 5.22×107gmol−1(Fe)h−1] toward ethylene polymerization, producing highly linear polyethylene products. Optimization of the reaction parameters gave polyethylenes with narrow molecular weight distributions, indicating that single-site active species were formed; the molecular weights of the resultant polyethylenes could also be controlled. [Display omitted]
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2011.11.024