Investigations of the Ligand Electronic Effects on α-Diimine NickelII Catalyzed Ethylene PolymerizationReportar como inadecuado




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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

Abstract The synthesis and characterization of a series of dibenzhydryl-based α-diimine NiII 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 NiII 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 NiII system, the electronic perturbations exhibit little variation on the ethylene polymerization. In the Niacac 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





Autor: Lihua Guo 1, Shengyu Dai 2 and Changle Chen 2,*

Fuente: http://mdpi.com/



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