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Trialkylaluminum-Free Modified Methylaluminoxane as a Cocatalyst for Living Polymerization of Olefins

  • Takeshi Shiono
Chapter
Part of the Advances in Polymer Science book series (POLYMER, volume 258)

Abstract

This article reviews living polymerization of olefins with several dimethyltitanium complexes by the use of trialkylaluminum-free modified methylaluminoxane (dMMAO) as a cocatalyst. The excellent solubility of dMMAO allows living coordination polymerization of olefins in aliphatic hydrocarbons. A chelating diamidodimethyltitanium complex (1) conducted living polymerization of propene in heptane at 0°C to produce atactic polymer. Metal oxide-supported dMMAO was also effective as a cocatalyst for the controlled polymerization of propene with 1, where the propagation rate and the molecular weight distribution of the produced polymer were dependent on the metal oxide used. ansa-Dimethysilylene(fluorenyl)(tert-butylamido)dimethyltitanium (2) activated by dMMAO conducted living polymerization of propene at 0°C in chlorobenzene, toluene and heptane. The propagation rate and the syndiotactic(syn)-specificity of the catalyst were dependent on the solvent as follows: propagation rate, chlorobenzene > toluene > heptane; syn-specificity, chlorobenzene < toluene < heptane. The propagation rate and the syn-specificity were also dependent on the substituent on the fluorenyl ligand of 2, and a highly active and syn-specific living polymerization was achieved by the use of a 3,6-di-tert-butyl substituted complex (4). Complex 2 and its derivatives such as 4 activated by dMMAO also conducted living homo- and copolymerization of norbornene and 1-alkene in toluene, which afforded a variety of tailor-made polyolefins composed of norbornene and 1-alkene.

Keywords

1-Alkene Living polymerization Modified methylaluminoxane Norbornene Propene Single-site catalyst Supported catalyst 

Notes

Acknowledgements

The author acknowledges Tosoh Finechem Co. for donating cocatalysts.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Graduate School of EngineeringHiroshima UniversityHigashi-HiroshimaJapan

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