High-Performance α-Diimine Nickel Complexes for Facile Access of PE Elastomers with Exceptional Material Properties

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外文摘要：For practicable elastomeric polyethylene,achieving high catalyst thermal stability and activity,along with precise control of polymer properties such as branching density,molecular weights,and distribution,is crucial but challenging.In this study,two sets of symmetrical a-diimine nickel complexes,each comprising four nickel bromide or chloride complexes,were synthesized and investigated their performance for ethylene polymerization under various reaction conditions.Upon activation with either Et2AlCl or MMAO cocatalysts,these complexes displayed not only high activity but also generated high molecular weight polyethylenes with controlled polydispersity and a substantial number of branches.The catalyst with the least steric hindrance displayed the remarkable high activity(up to 1.2×107 g·mol-1·h-1).Notably,nickel bromides demonstrated higher activity compared to their chloride counterparts.The investigation into the effect of reaction temperature on catalytic per-formance revealed that NiBrMe-MMAO system displayed high thermal stability(activity up to 2.51 ×106 g·mol-1·h-1 at 100 ℃)and consistently yielded high polymer molecular weights with narrow polydispersity over a broad temperature range of 30-100 ℃.Of significant note,mechani-cal analysis of the resulting polyethylene demonstrated excellent ultimate tensile strength and high strain at break.Particularly,the polyethylene sample prepared at 100 ℃ exhibited ultimate tensile strength up to 10 MPa with 1863％maximum strain at break and a strain recovery of up to 54.9％after ten cycles at a fixed strain of 300％,indicating excellent material properties of prepared thermoplastic polyethylene elastomers(TPE).

外文关键词：

Thermoplastic polyethylene elastomersα-Diimine nickel pre-catalystsEthylene polymerizationMechanical propertiesHighly branched polyethylene

作者：

Li-Dong Qin、Xin-Yu Wang、Qaiser Mahmood、Zhi-Xin Yu、Yi-Zhou Wang、Song Zou、Tong-Ling Liang、Wen-Hua Sun

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作者单位：

School of Pharmaceutical Sciences,Changchun University of Chinese Medicine,Changchun 130117,China

Chemistry and Chemical Engineering Guangdong Laboratory,Shantou 515031,China

Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China

基金：

Chemistry and Chemical Engineering Guangdong LaboratoryChemistry and Chemical Engineering Guangdong LaboratoryForeign Youth Talent Program

项目编号：

21110182132012QN2022030008L

出版年：

2024

DOI：

10.1007/s10118-024-3073-0

高分子科学(英文版)

中国化学会　中国科学院化学研究所

高分子科学(英文版)

CSTPCD

影响因子：0.721

ISSN：0256-7679

年,卷(期)：2024.42(5)