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

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 acti...

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Published in:高分子科学：英文版 2013 (4), p.563-573
Main Author: Hai-yang Gao Feng-shou Liu Hai-bin Hu Fang-ruing Zhu Qing Wu
Format: Article
Language:English
Subjects:
α-二亚胺
不对称
乙烯合成
双峰聚乙烯
取代基效应
取代苯胺基
镍配合物
非对称
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description 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.
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subjects α-二亚胺
不对称
乙烯合成
双峰聚乙烯
取代基效应
取代苯胺基
镍配合物
非对称
title SYNTHESIS OF BIMODAL POLYETHYLENE WITH UNSYMMETRICAL a-DIIMINE NICKEL COMPLEXES： INFLUENCE OF LIGAND BACKBONE AND UNSYM-SUBSTITUTED ANILINE MOIETY
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