Citation: Quan Wang, Zhao Zhang, Chen Zou, Changle Chen. A general cocatalyst strategy for performance enhancement in nickel catalyzed ethylene (co)polymerization[J]. Chinese Chemical Letters, ;2022, 33(9): 4363-4366. doi: 10.1016/j.cclet.2021.12.036 shu

A general cocatalyst strategy for performance enhancement in nickel catalyzed ethylene (co)polymerization

CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China

chen1215@mail.ustc.edu.cn

changle@ustc.edu.cn

Received Date: 10 November 2021
Revised Date: 6 December 2021
Accepted Date: 15 December 2021
Available Online: 20 December 2021

Figures(2)

The tuning of olefin-polymerization catalyst properties through ligand modifications is efficient but requires complicated and costly syntheses. In this contribution, a simple Bu₂Mg-based cocatalyst strategy is designed that can simultaneously enhance the catalytic properties (activity, thermal stability, polymer molecular weight, branching density, melting point, etc.) of various nickel catalysts (α-diimine nickel, pyridine imine nickel and iminopyridine-N-oxide nickel) in ethylene polymerization, and enable great product morphology control. For example, a simple α-diimine nickel catalyst can demonstrate polymerization activity of up to 1.29 × 10⁷ g mol⁻¹ h⁻¹ and molecular weight of up to 1.90 × 10⁶ g/mol in the presence of Bu₂Mg cocatalyst. The resulting polyethylenes exhibit excellent mechanical properties, with tensile stress of up to 47.4 MPa and strain of up to 1020%. This cocatalyst strategy is generally applicable to different nickel catalysts, and can lead to property enhancement in ethylene copolymerization with a series of polar comonomers such as methyl 10-undecylenate, 10-undecylenic acid and 10-undecenol.
- Nickel,
- Cocatalyst,
- Magnesium,
- Ethylene polymerization
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