Linear/branched Block Polyethylene Produced by <italic style="font-style: italic">α</italic>-Diimine Nickel(II) Catalyst and Bis(phenoxy-imine) Zirconium Binary Catalyst System in the Presence of Diethyl Zinc

Ding-Ding Zhao; Yan-Hui Hou; Ke-Ning Zong; Mi-Mi Cui; Bin-Yuan Liu; Min Yang

doi:10.1007/s10118-021-2629-5

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Linear/branched Block Polyethylene Produced by α-Diimine Nickel(II) Catalyst and Bis(phenoxy-imine) Zirconium Binary Catalyst System in the Presence of Diethyl Zinc

ARTICLE | Updated：2021-08-26

- Linear/branched Block Polyethylene Produced by α-Diimine Nickel(II) Catalyst and Bis(phenoxy-imine) Zirconium Binary Catalyst System in the Presence of Diethyl Zinc
- Chinese Journal of Polymer Science Vol. 39, Issue 12, Pages: 1581-1589(2021)
- Affiliations：
  
  a.Hebei Key Laboratory of Functional Polymers, Institute of Polymer Science and Engineering, Hebei University of Technology, Tianjin 300130, China
  b.State Key Laboratory of Separation Membranes and Membrane Processes, School of Material Science and Engineering, Tiangong University, Tianjin 300160, China
- Author bio：
  
  houyh1977@163.com (Y.H.H.)
  polyym@163.com (M.Y.)
- Funds：
- DOI：10.1007/s10118-021-2629-5
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Ding-Ding Zhao, Yan-Hui Hou, Ke-Ning Zong, et al. Linear/branched Block Polyethylene Produced by α-Diimine Nickel(II) Catalyst and Bis(phenoxy-imine) Zirconium Binary Catalyst System in the Presence of Diethyl Zinc. [J]. Chinese Journal of Polymer Science 39(12):1581-1589(2021)
DOI：

Ding-Ding Zhao, Yan-Hui Hou, Ke-Ning Zong, et al. Linear/branched Block Polyethylene Produced by α-Diimine Nickel(II) Catalyst and Bis(phenoxy-imine) Zirconium Binary Catalyst System in the Presence of Diethyl Zinc. [J]. Chinese Journal of Polymer Science 39(12):1581-1589(2021) DOI： 10.1007/s10118-021-2629-5.

摘要

Abstract

In order to promote development of linear/branched block polyethylenes based on new catalytic systems, we synthesized a novel ,α,-diimine nickel(II) complex with isopropyl substituents on ,ortho,-,N,-aryl and hydroxymethyl phenyl substituents on ,para,-,N,-aryl structures. The activity of ,α,-diimine nickel(II) catalyst was 3.02×10,6, g·mol,Ni,−1,·h,−1, at 70 °C, and resultant polyethylene possessed 135/1000C branches. The linear/branched block polyethylenes were synthesized from ethylene polymerization catalyzed by the ,α,-diimine nickel(II) complex/bis(phenoxy-imine) zirconium in the presence of diethyl zinc. With the addition of ZnEt,2, (from 0 to 400), the melting peak of resultant polyethylene changed from a single melting peak to bimodal melting peaks. The molecular weights of resultant polyethylene ranging from 26.8 kg/mol to 17.1 kg/mol and PDI values varying gradually from 24.4 to 15.2 were obtained ,via, adjusting ZnEt,2, equiv. and molar ratio of two catalysts. In addition, the branching degree of the polyethylene increased from 13/1000C to 56/1000C with the increase of the proportion of ,α,-diimine nickel(II) catalyst. Using this binary catalyst system, the reaction temperature of chain shuttling polymerization can be carried out at 70 °C, which is more conducive to industrial application.

关键词

Keywords

Chain shuttling polymerizationLinear/branched block polyethyleneα-Diimine nickelBis(phenoxy-imine) zirconiumEthylene

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Linear/branched Block Polyethylene Produced by α-Diimine Nickel(II) Catalyst and Bis(phenoxy-imine) Zirconium Binary Catalyst System in the Presence of Diethyl Zinc

DOI：10.1007/s10118-021-2629-5

摘要

Abstract

关键词

Keywords

references