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Citation: MU Hongliang, LI Yanguo, LI Yuesheng. Ethylene Homo- and Copolymerization by Single Component Phosphinophenolate Neutral Nickel Catalysts[J]. Chinese Journal of Applied Chemistry, ;2012, 29(12): 1381-1388. doi: 10.3724/SP.J.1095.2012.20490 shu

Ethylene Homo- and Copolymerization by Single Component Phosphinophenolate Neutral Nickel Catalysts

1.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Corresponding author: LI Yuesheng,
Received Date: 29 October 2012
Available Online: 6 November 2012

A series of phosphinophenolate neutral nickel catalysts bearing pyridine as spectator ligands(2-P(R₁)(R₂)-C₆H₃(R)O)Ni(Me)(Py)(3a,R=H,R₁=R₂=Ph;3b,R=t-Bu,R₁=R₂=Ph;3c,R=R₁=R₂=Ph;3d,R=anthr,R₁=R₂=Ph;3e,R=R₁=t-Bu,R₂=Ph) have been synthesized and characterized by ¹H,¹³C and ³¹P NMR.As a kind of single component catalysts,other than 3a they all showed a higher catalitic activty to ethylene polymerization reaction,and a high catalytic activity up to 4460 kg PE/(mol(Ni)·h) was achieved by introducing proper steric effection groups at ortho position of its phenoxy group(3c~3d).Molecular mass of the polymer can be adjusted by varying the substituents as the ortho-position of phenoxy group,and using catalysts 3c~3d with aryl substituents in ethylene polymerization reaction could produced higher molecular mass polymer.Catalyst 3e with a tert-butyl group at its phosphorous atom showed similar activity as that of catalyst 3b and was more readily initiated,producing polymers of lower molecular msses under the same conditions.Moreover,these catalysts were tolerant towards polar groups and able to catalyze copolymerization of ethylene with norbornene or its polar derivative 5-norbornene-2-yl acetate.
- neutral nickel catalyst,
- ethylene polymerization,
- polar group tolerance,
- single component catalyst
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