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Bidentate Pyridyl‐Amido Hafnium Catalysts for Copolymerization of Ethylene with 1‐Octene and Norbornene

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A series of bidentate pyridyl-amido hafnium catalysts have been designed, synthesized and used for ethylene polymerization and for the copolymerization of ethylene with 1-octene and norbornene.


Abstract

Polyolefin elastomers (POEs) and cyclic olefin copolymers (COCs) are high-performance polyolefin materials of wide interest. It is crucial to develop low-cost and high-performance transition metal catalysts to prepare these polyolefin materials. In this contribution, we designed and synthesized a series of bidentate pyridyl-amido hafnium catalysts and used them in ethylene polymerization and copolymerization with comonomers including 1-octene and norbornene. These catalysts exhibited high activities of up to 16.3×106 g mol−1 h−1 and produced polyethylene with a high molecular weight of up to 24.5×104 g mol−1 in ethylene polymerization at 150 °C. More importantly, these catalysts produced ethylene/1-octene copolymers with incorporation of up to 13.7 mol % and molecular weight of up to 72.7×104 g mol−1, and prepared ethylene/norbornene copolymers with incorporation of up to 50.3 mol %, along with glass transition temperature of up to 184.3 °C and molecular weight of up to 187.6×104 g mol−1. The ease of synthesis, high versatility and great copolymerization properties of these hafnium catalysts make them highly attractive for future studies.

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