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Polymers 2016, 8(2), 37; doi:10.3390/polym8020037

Investigations of the Ligand Electronic Effects on α-Diimine Nickel(II) Catalyzed Ethylene Polymerization

1
School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
2
Key Laboratory of Soft Matter Chemistry, Chinese Academy of Sciences, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
*
Author to whom correspondence should be addressed.
Academic Editor: Thomas Junkers
Received: 30 December 2015 / Revised: 20 January 2016 / Accepted: 26 January 2016 / Published: 29 January 2016
(This article belongs to the Special Issue Metal-Mediated Polymer Synthesis)
View Full-Text   |   Download PDF [1037 KB, uploaded 29 January 2016]   |  

Abstract

The synthesis and characterization of a series of dibenzhydryl-based α-diimine Ni(II) complexes bearing a range of electron-donating or -withdrawing groups are described. Polymerization with ethylene is investigated in detail, involving the activator effect, influence of polymerization conditions on catalyst activity, thermal stability, polymer molecular weight and melting point. All of these Ni(II) complexes show great activity (up to 6 × 106 g of PE (mol of Ni)−1·h−1), exceptional thermal stability (stable at up to 100 °C) and generate polyethylene with very high molecular weight (Mn up to 1.6 × 106) and very narrow molecular weight distribution. In the dibromo Ni(II) system, the electronic perturbations exhibit little variation on the ethylene polymerization. In the Ni(acac) system, dramatic ligand electronic effects are observed in terms of catalytic activity and polyethylene molecular weight. View Full-Text
Keywords: α-diimine; Nickel; dibenzhydryl; ethylene polymerization; electronic effect; cocatalyst α-diimine; Nickel; dibenzhydryl; ethylene polymerization; electronic effect; cocatalyst
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Guo, L.; Dai, S.; Chen, C. Investigations of the Ligand Electronic Effects on α-Diimine Nickel(II) Catalyzed Ethylene Polymerization. Polymers 2016, 8, 37.

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