Synthesis and ethylene polymerization of 8-(fluorenylarylimino)-5,6,7-trihydroquinolylnickel chlorides: Tailoring polyethylenes by adjusting fluorenyl position and adduct Et2Zn

被引：30

作者：

Zeng, Yanning ^{[1
,2
]}

Mahmood, Qaiser ^{[1
,2
,3
]}

Hao, Xiang ^{[1
,2
]}

Sun, Wen-Hua ^{[1
,2
,3
,4
]}

机构：

[1] Chinese Acad Sci, Key Lab Engn Plast, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China

[3] Univ Chinese Acad Sci, Int Sch, Beijing 100049, Peoples R China

[4] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China

来源：

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | 2017年 / 55卷 / 11期

基金：

中国国家自然科学基金;

关键词：

cationic polymerization; metal-organic catalysts; polyethylene; molecular weight distribution; nickel; BIMODAL MOLECULAR-WEIGHT; CATALYST PRECURSORS; MECHANICAL-PROPERTIES; SUBSTITUTED LIGANDS; PRE-CATALYSTS; COMPLEXES; BEHAVIOR; OLIGOMERIZATION; MICROSTRUCTURE; POLYPROPYLENE;

D O I：

10.1002/pola.28563

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A series of 8-(arylimino)-5,6,7-trihydroquinolines ligand pendant fluorenyl group at N-aryl ring, and their nickel complexes (Ni1-Ni5) have been prepared and characterized. Once activated with Et2AlCl, the complexes Ni1, Ni2, and Ni3 bearing ligands from para-fluorenylaniline produced unimodal polyethylenes; on the contrary complexes Ni4 and Ni5 gave bimodal polyethylenes due to steric influence of ligands from ortho-fluorenyl anilines. With a increment of Et2Zn/Ni4 ratio from 0 to 400, the distinct bimodel polyethylenes were obtained with molecular weights shifted from 14.3 to 57.6 kgmol(-1); apart shiftment to higher molecular weights, the portion of low molecular weight decreased along with higher portion of high molecular weight. (c) 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 1910-1919

引用

页码：1910 / 1919

页数：10

共 66 条

[1] Polypropylene "chain shuttling" at enantiomorphous and enantiopure catalytic species: Direct and quantitative evidence from polymer microstructure [J].