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Issue 10, 2010
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Propylenepolymerization to high molecular weight atactic polypropylene and copolymerization with 1-hexene using monocyclopentadienyl titaniumcatalysts

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Abstract

A number of cyclopentadienyltitanium aryloxide complexes, 1-Ar-2,3,4,5-Me4-Cp(2,6-iPr2C6H3O)TiCl2 (Ar = 4-Me3SiPhenyl (5), 4-iPrPhenyl (6), 4-MePhenyl (7), 3,5-(CF3)2Phenyl (8)) and (1-Ar-2,3,4,5-Me4CpTiCl2)2(OAr′O) (Ar′ = 4,4′-(3,3′,5,5′-iPr4C6H2–C6H2), Ar = 4-SiMe3Phenyl (9), 4-MePhenyl (10)) were synthesized from the reaction of a corresponding cyclopentadienyl titanium trichloride derivative with the lithium salt of a relevant phenol. The molecular structures of complexes 6, 7 and 8 were determined by X-ray crystallography. Upon activation with iBu3Al and Ph3CB(C6F5)4, all mononuclear complexes 5–8 exhibit good catalytic activities for propylene polymerization, whereas the binuclear complexes 9 and 10 show lower catalytic activities under the same polymerization conditions. 13C NMR, DSC and GPC analysis indicates the produced polymers are atactic polypropylene with relatively high molecular weight. It was found that the substituents on both the cyclopentadienyl and aryloxy ligands of these complexes show obvious influence on the molecular weight of the resultant polymers with complex 5 producing the highest molecular weight atactic polypropylene. Complexes 5, 6 and 7 were also tested as catalysts for copolymerization of propylene with 1-hexene and copolymers with 1.2–10.1% comonomer incorporation were obtained in reasonable catalytic activity.

Graphical abstract: Propylene polymerization to high molecular weight atactic polypropylene and copolymerization with 1-hexene using monocyclopentadienyl titanium catalysts

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Supplementary files

Article information


Submitted
15 Oct 2009
Accepted
14 Dec 2009
First published
22 Jan 2010

Dalton Trans., 2010,39, 2525-2535
Article type
Paper

Propylene polymerization to high molecular weight atactic polypropylene and copolymerization with 1-hexene using monocyclopentadienyl titanium catalysts

Q. Wu, Q. Su, L. Ye, G. Li and Y. Mu, Dalton Trans., 2010, 39, 2525
DOI: 10.1039/B921617K

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