Tandem catalysis of iron and titanium non-metallocene catalysts for the production of branched polyethylene

Branched polyethylene was successfully produced with ethylene as the sole monomer stock by a novel binary tandem catalyst system composed of 2,6-bis(imino)pyridyl iron complex (1) and mono β-diiminato titanium complex (2) activated only by MMAO, in which the complex 2 was the first non-metallocene t...

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Bibliographic Details
Published in:Catalysis communications 2014-02, Vol.45, p.7-10
Main Authors: Xie, Guangyong, Liu, Gongyi, Li, Long, Li, Tingcheng, Zhang, Aiqing, Feng, Jiwen
Format: Article
Language:English
Subjects:
Branched polyethylene
Iron complex
Non-metallocene catalyst
Tandem catalysis
Titanium complex
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Summary:Branched polyethylene was successfully produced with ethylene as the sole monomer stock by a novel binary tandem catalyst system composed of 2,6-bis(imino)pyridyl iron complex (1) and mono β-diiminato titanium complex (2) activated only by MMAO, in which the complex 2 was the first non-metallocene titanium complex used as copolymerization catalyst. The copolymerization activity can reach up to 106g/molTi·h·atm. And by simple adjustment of the catalyst molar ratios and polymerization conditions, polymers with various branches including ethyl, butyl and long branches and varying branching degrees (from 0 to 10.7/1000C) can be efficiently produced. [Display omitted] •A novel binary tandem catalyst system composed of two non-metallocene catalysts•2,6-Bis(imino)pyridyl iron complex (1) and mono β-diiminato titanium complex (2)•In-situ copolymerize ethylene to branched polyethylene with high activity•Polymers with various branches and branching degrees can be efficiently produced.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2013.10.029