Nickel-catalyzed direct synthesis of hyperbranched liquid oligoethylene

被引:0
|
作者
Zhang, Mengyao [1 ]
Dai, Shengyu [1 ,2 ]
机构
[1] Anhui Univ, Inst Phys Sci & Informat Technol, Hefei 230601, Anhui, Peoples R China
[2] Anhui Normal Univ, Sch Chem & Mat Sci, Anhui Lab Mol Based Mat, Minist Educ,Key Lab Funct Mol Solids, Wuhu 241002, Peoples R China
关键词
ALPHA-DIIMINE NICKEL; ETHYLENE POLYMERIZATION; PALLADIUM(II) COMPLEXES; SUBSTITUENTS; POLYETHYLENE; OLIGOMERIZATION; ACRYLATE;
D O I
10.1039/d4py00709c
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Late transition metal-catalyzed ethylene chain-walking polymerization offers a remarkably convenient method for synthesizing hyperbranched polyethylene. In this study, we created a series of pyridine-imine Ni(ii) complexes with axially flexible cycloalkyl substituents, tailored for the production of hyperbranched oligoethylene oils (HBOEOs). These complexes exhibited moderate activity in HBOEO synthesis, reaching rates of up to 4.90 x 105 g mol-1 h-1. The resulting products exhibited low molecular weights (325-523 g mol-1) and high branching densities (110-167/1000C). NMR analysis verified their diverse branching structures, with a significant proportion of hyperbranched motifs. Notably, the activity, structure, and properties of the HBOEOs produced by the catalytic system were significantly influenced by alterations in the catalyst structure and oligomerization conditions. Specifically, when compared to rigid phenyl substituents, flexible cycloalkyl substituents proved more effective in promoting the catalytic system to produce HBOEOs with a higher degree of branching and improved liquefaction properties. This study introduces nickel pyridine-imine catalysts with axially flexible cycloalkyl substituents, enhancing the branching density of hyperbranched oligoethylene for improved fluidity and liquidity.
引用
收藏
页码:4627 / 4636
页数:11
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