Citation: Hai-yang Gao, Feng-shou Liu, Hai-bin Hu, Fang-ming Zhu, Qing Wu. SYNTHESIS OF BIMODAL POLYETHYLENE WITH UNSYMMETRICAL -DIIMINE NICKEL COMPLEXES: INFLUENCE OF LIGAND BACKBONE AND UNSYM-SUBSTITUTED ANILINE MOIETY[J]. Chinese Journal of Polymer Science, ;2013, 31(4): 563-573. doi: 10.1007/s10118-013-1251-6 shu

SYNTHESIS OF BIMODAL POLYETHYLENE WITH UNSYMMETRICAL -DIIMINE NICKEL COMPLEXES: INFLUENCE OF LIGAND BACKBONE AND UNSYM-SUBSTITUTED ANILINE MOIETY

Corresponding author: Qing Wu,
Received Date: 26 October 2012
Revised Date: 28 November 2012

Fund Project: The work was financially supported by NSFC (Nos. 21274167, 51173209 and 21174164), CNPC Innovation Foundation, and the Fundamental Research Funds for the Central Universities (Project 10lgpy10).

A series of unsymmetrical a-diimine nickel complexes with various backbones and substituted aniline moieties were synthesized and characterized. The crystallographic analysis of the nickel complexes confirmed the existence of meso- and rac-configuration in solid structure. Nickel complexes after activation by MAO were screened for ethylene polymerization to evaluate backbone substituent effect on synthesis of bimodal PE. Acenaphthyl nickel complex with planar backbone afforded a bimodal PE with a broad polydispersity, whereas camphyl nickel complex with rigid and bulky backbone afforded a monomodal PE with a narrow polydispersity. Steric effect of aniline moiety for acenaphthyl nickel complex was also examined, and bimodal PE with dominant high-molecular-weight fraction was obtained by modifying substituents on aniline moiety.
- a-Diimine nickel
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