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

作　　者：Hai-yang Gao Feng-shou Liu Hai-bin Hu Fang-ming Zhu 伍青 

机构地区：[1]DSAPM Lab,PCFM Lab,Institute of Polymer Science,School of Chemistry and Chemical Engineering,Sun Yat-Sen University

出　　处：《Chinese Journal of Polymer Science》2013年第4期563-573,共11页高分子科学（英文版）

基　　金：supported by NSFC (Nos. 21274167, 51173209 and 21174164);CNPC Innovation Foundation;the Fundamental Research Funds for the Central Universities (Project 10lgpy10)

摘　　要：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 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.

关 键 词：a-Diimine nickel Stereo-isomer Polyethylene Bimodal molecular weight distribution. 

分 类 号：O634[理学—高分子化学]