Benzosuberyl Substituents as a "Sandwich-like" Function in Olefin Polymerization Catalysis

Yu-Yin Wang; Chao-Qun Wang; Xiao-Qiang Hu; Yan Xia; Yue Chi; Yi-Xin Zhang; Zhong-Bao Jian

doi:10.1007/s10118-021-2562-7

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Benzosuberyl Substituents as a "Sandwich-like" Function in Olefin Polymerization Catalysis

ARTICLE | Updated：2021-04-30

- Benzosuberyl Substituents as a "Sandwich-like" Function in Olefin Polymerization Catalysis
- Chinese Journal of Polymer Science Vol. 39, Issue 8, Pages: 984-993(2021)
- Affiliations：
  
  a.College of Chemistry and Life Science, Advanced Institute of Materials Science, Changchun University of Technology, Changchun 130012, China
  b.Key Laboratory of Advanced Structural Materials of Ministry of Education, College of Material Science and Engineering, Changchun University of Technology, Changchun 130012, China
  c.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- Author bio：
  
  yuechi@ccut.edu.cn (Y.C.)
  zhangyixin@ciac.ac.cn (Y.X.Z.)
  zbjian@ciac.ac.cn (Z.B.J.)
- Funds：
- DOI：10.1007/s10118-021-2562-7
  CLC：
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Yu-Yin Wang, Chao-Qun Wang, Xiao-Qiang Hu, et al. Benzosuberyl Substituents as a "Sandwich-like" Function in Olefin Polymerization Catalysis. [J]. Chinese Journal of Polymer Science 39(8):984-993(2021)
DOI：

Yu-Yin Wang, Chao-Qun Wang, Xiao-Qiang Hu, et al. Benzosuberyl Substituents as a "Sandwich-like" Function in Olefin Polymerization Catalysis. [J]. Chinese Journal of Polymer Science 39(8):984-993(2021) DOI： 10.1007/s10118-021-2562-7.

摘要

Abstract

For the rational design of metal catalyst in olefin polymerization catalysis, various strategies were applied to suppress the chain transfer by bulking up the axial positions of the metal center, among which the ”sandwich” type turned out to be an efficient category in achieving high molecular weight polyolefin. In the ,α,-diimine system, the “sandwich” type catalysts were built using the typical 8-aryl-naphthyl framework. In this contribution, by introducing the rotationally restrained benzosuberyl substituent into the ,ortho,-position of ,N,-aryl rings, a new class of “sandwich-like” ,α,-diimine nickel catalysts was constructed and fully identified. The rotationally restrained benzosuberyl substituents played a “sandwich-like” function by capping the nickel center from two axial sites. Compared to the nickel catalyst ,Ni1, bearing freely rotated benzhydryl substituent,Ni2, featuring benzosuberyl substituent enabled the increase (8 times) of polymer molecular weights from 8 kDa to 65 kDa in the polymerization of ethylene. By further increasing the steric bulk of another ,ortho,-site of the ,N,-aryl ring, the polymer molecular weight even reached an ultrahigh level of 833 kDa (,M,w,=1857 kDa) using the optimized ,Ni3,. Notably, these nickel catalysts could also mediate the copolymerization of ethylene with methyl 10-undecenoate, with ,Ni3, giving the highest copolymer molecular weight (88 kDa) and the highest incorporation of comonmer (2.0 mol%), along with high activity of up to 10,5, g·mol,−1,·h,−1,.

关键词

Keywords

Olefin polymerizationBenzosuberyl substituentSandwichNickel catalystPolar monomer

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School of Materials Science and Engineering, PCFM Lab, GD HPPC Lab, Sun Yat-sen University

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University

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