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Published March 15, 2013 | public
Journal Article

Chelating N-heterocyclic carbene group IV complexes for the polymerization of ethylene and styrene


Chelating N-heterocyclic carbene zirconium and titanium complexes, combined with MAO, have been employed in the polymerization of ethylene and styrene. These complexes have been designed to simulate the highly successful phenoxy-imine ligated, non-metallocene complexes developed by scientists at Mitsui. Investigations into the effects of metal center, pressure, temperature, and time on the polymerization of ethylene were carried out. Extremely high molecular weight polyethylene could be produced (approaching 1 million Da), with industrially desirable, broad molecular weight distributions. In the case of styrene polymerizations utilizing the titanium catalyst, highly syndiotactic polystyrene was produced.

Additional Information

© 2012 Elsevier B.V. Received 22 September 2012. Received in revised form. 19 November 2012. Accepted 19 November 2012. The authors express their appreciation to the support from the Ministry of Higher Education, Saudi Arabia, in establishment of the Center of Research Excellence in Petroleum Refining & Petrochemicals at King Fahd University of Petroleum & Minerals (KFUPM). The support of KFUPM is also highly appreciated.

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