The synthesis and X-ray structure of a phenoxyimine catalyst tailored for living olefin polymerisation and the synthesis of ultra-high molecular weight polyethylene and atactic polypropylene

摘要

A phenoxyimine catalyst (bis-(N-(3', 5'-diiodo-salicylidene) -2,6-difluoroaniline) -titanium(IV)-dichloride has been synthesised. The ligand as well as the complex have been fully characterised. An X-ray structure of the titanium complex was obtained. After activation with MAO, it was used as highly active catalyst in living olefin polyrnerisation of ethylene and propylene. Ultra-high molecular weight polyethylene and atactic polypropylene of low polydispersity were obtained. The living character of the polymerisation was shown by online polymerisation kinetics and linear growth of number-average molar mass with polymerisation time. In addition, the influence of hydrogen as a chain transfer agent was studied in living olefin polymerisation. (c) 2006 Elsevier B.V. All rights reserved.