二亚胺
催化作用
材料科学
乙烯
电子顺磁共振
辛烯
共聚物
1-辛烯
高分子化学
有机化学
聚合物
核磁共振
复合材料
化学
物理
作者
Lei Zhu,Haojie Yu,Li Wang,Yusheng Xing
标识
DOI:10.1016/j.mtcomm.2021.102801
摘要
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.
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