High-Performance <italic style="font-style: italic">α</italic>-Diimine Nickel Complexes for Facile Access of PE Elastomers with Exceptional Material Properties

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

doi:10.1007/s10118-024-3073-0

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

RESEARCH ARTICLE | Updated：2024-04-12

- High-Performance α-Diimine Nickel Complexes for Facile Access of PE Elastomers with Exceptional Material Properties
- Chinese Journal of Polymer Science Vol. 42, Issue 5, Pages: 620-635(2024)
- Affiliations：
  
  a.School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun 130117, China
  b.Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China
  c.Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Author bio：
  
  qaiser@ccelab.com.cn (Q.M.)
  yuzx01@ccucm.edu.cn (Z.X.Y.)
  whsun@iccas.ac.cn (W.H.S.)
- Funds：
- DOI：10.1007/s10118-024-3073-0
  CLC：
- Published：1 May 2024，
  
  Published Online：26 December 2023，
  
  Received：4 November 2023，
  
  Revised：21 November 2023，
  
  Accepted：27 November 2023
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Qin, L. D.; Wang, X. Y.; Mahmood, Q.; Yu, Z. X.; Wang, Y. Z.; Zou, S.; Liang, T. L.; Sun, W. H. High-performance α-diimine nickel complexes for facile access of PE elastomers with exceptional material properties. Chinese J. Polym. Sci. 2024, 42, 620–635

Li-Dong Qin, Xin-Yu Wang, Qaiser Mahmood, et al. High-Performance α-Diimine Nickel Complexes for Facile Access of PE Elastomers with Exceptional Material Properties. [J]. Chinese Journal of Polymer Science 42(5):620-635(2024)
Qin, L. D.; Wang, X. Y.; Mahmood, Q.; Yu, Z. X.; Wang, Y. Z.; Zou, S.; Liang, T. L.; Sun, W. H. High-performance α-diimine nickel complexes for facile access of PE elastomers with exceptional material properties. Chinese J. Polym. Sci. 2024, 42, 620–635 DOI： 10.1007/s10118-024-3073-0.

Li-Dong Qin, Xin-Yu Wang, Qaiser Mahmood, et al. High-Performance α-Diimine Nickel Complexes for Facile Access of PE Elastomers with Exceptional Material Properties. [J]. Chinese Journal of Polymer Science 42(5):620-635(2024) DOI： 10.1007/s10118-024-3073-0.

摘要

In this study

symmetrical α-diimine nickel precatalysts displayed high activity (typically 10

- 10

g mol-1 h

−1

) and robust thermal stability for synthesizing highly branched polyethylene. Mechanical analysis demonstrated excellent tensile strength and strain recovery

highlighting the superior material properties of the prepared thermoplastic polyethylene elastomers.

Abstract

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

-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 Et

AlCl 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 1.2×10

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 performance revealed that

NiBr

-MMAO system displayed high thermal stability (activity up to 2.51×10

g·mol

−1

·h

−1

at 100 °C) and consistently yielded high polymer molecular weights with narrow polydispersity over a broad temperature range of 30−100 °C. Of significant note

mechanical analysis of the resulting polyethylene demonstrated excellent ultimate tensile strength and high strain at break. Particularly

the polyethylene sample prepared at 100 °C 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).

关键词

Keywords

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

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.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 4 Kosygin St., Moscow

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Tianjin Key Lab of Composite & Functional Materials, School of Material Science and Engineering, Tianjin University

Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1, Moscow 119991, Russian Federation

⁰

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

DOI：10.1007/s10118-024-3073-0

摘要

Abstract

关键词

Keywords

references