In this study, based on α-diimine-Ni(II) complex/MAO catalytic system, 1-octene was introduced into polyethylene chain to change the microstructure. The effects of reaction temperature, Al/Ni ratio and concentration of 1-octene on the catalytic effect were investigated. Furthermore, the differences between α-olefin homopolymerization and ethylene/α-olefin copolymerization were compared, and the differences between ethylene insertion and α-olefin insertion catalyzed by α-diimine-Ni(II) complex were studied. α-Diimine-Ni(II) complex tends to catalyze ethylene polymerization to form highly branched segments and catalyze α-olefin polymerization to form relatively linear segments due to the “chain walking” ability. The results of mechanical tests show that the synthesized ethylene/1-octene copolymers are polyolefin elastomers with excellent tensile properties. EPR was also employed to analyze the formation of Ni(I) species in the catalytic system and the catalytic mechanism.

在这项研究中，基于α-二亚胺-Ni(II)配合物/MAO催化体系，将1-辛烯引入聚乙烯链以改变微观结构。考察了反应温度、Al/Ni比和1-辛烯浓度对催化效果的影响。进一步比较了α-烯烃均聚与乙烯/α-烯烃共聚的差异，研究了α-二亚胺-Ni(II)配合物催化乙烯插入与α-烯烃插入的差异。由于“链行走”能力，α-二亚胺-Ni(II)配合物倾向于催化乙烯聚合形成高度支化的链段并催化α-烯烃聚合形成相对线性的链段。力学试验结果表明，合成的乙烯/1-辛烯共聚物是具有优异拉伸性能的聚烯烃弹性体。EPR 还用于分析催化体系中 Ni(I) 物种的形成和催化机制。