

FOLLOWUS
a.Tianjin Key Lab of Composite & Functional Materials, School of Material Science and Engineering, Tianjin University, Tianjin 300072, China
b.Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1, Moscow 119991, Russian Federation
c.A N Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova st., 28, Moscow 119991, Russian Federation
lilypan@tju.edu.cn (L.P.)
ysli@tju.edu.cn (Y.S.L.)
Received:13 July 2023,
Revised:2023-8-1,
Accepted:03 August 2023,
Online First:15 September 2023,
Published:01 February 2024
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Wang, F.; Pan, L.; Tuskaev, V. A.; Gagieva, S. C.; Li, Y. S. Phosphine/benzocyclone-based neutral nickel catalysts for ethylene polymerization and copolymerization with polar monomers. Chinese J. Polym. Sci. 2024, 42, 202–212
Fei Wang, Li Pan, Vladislav A. Tuskaev, et al. Phosphine/Benzocyclone-based Neutral Nickel Catalysts for Ethylene Polymerization and Copolymerization with Polar Monomers[J]. Chinese Journal of Polymer Science, 2024, 42(2): 202-212.
Wang, F.; Pan, L.; Tuskaev, V. A.; Gagieva, S. C.; Li, Y. S. Phosphine/benzocyclone-based neutral nickel catalysts for ethylene polymerization and copolymerization with polar monomers. Chinese J. Polym. Sci. 2024, 42, 202–212 DOI: 10.1007/s10118-023-3044-x.
Fei Wang, Li Pan, Vladislav A. Tuskaev, et al. Phosphine/Benzocyclone-based Neutral Nickel Catalysts for Ethylene Polymerization and Copolymerization with Polar Monomers[J]. Chinese Journal of Polymer Science, 2024, 42(2): 202-212. DOI: 10.1007/s10118-023-3044-x.
A series of strategically designed neutral nickel catalysts with phosphine/benzocyclone-based ligand skeleton displayed high activity and thermal stability in ethylene polymerization to afford linear polyethylene. These bulky nickel catalysts also exhibited excellent tolerance towards acrylate functional groups and high incorporating capability
producing random copolymers with high molecular weights.
The efficient copolymerization of olefin with polar monomers using nickel-based catalysts presents a longstanding challenge. In this contribution
three phosphine-benzocyclone ligands and corresponding neutral nickel catalysts (
Ni1
: Ar = Ph;
Ni2
: Ar = 2-(C
6
H
5
)C
6
H
4
;
Ni3
: Ar = 2-[2'
6'-(MeO)
2
-C
6
H
3
]C
6
H
4
) were prepared and applied for the ethylene polymerization and copolymerization with polar monomers without any cocatalyst. The bulky substituent groups in complexes
Ni2
and
Ni3
contributed to high catalytic activities (up to 7.24×10
6
and 9.04×10
6
g·mol
Ni
‒1
·h
‒1
respectively)
and produced high-molecular-weight polyethylene (
M
w
up to 545.7 kDa). Complex
Ni3
exhibited high activities for ethylene polymerization at the level of 10
6
g·mol
Ni
‒1
·h
‒1
across a wide range from 30 °C to 120 °C
exhibiting excellent high temperature tolerance. These nickel complexes were also effectively employed in the copolymerization of ethylene with methyl acrylate
ethyl acrylate
butyl acrylate and lauryl acrylate
producing copolymers with high molecular weights (
M
w
up to 80.5 kDa) and high polar monomer incorporation (up to 8.2 mol%). Microstructure analyses revealed that the introduction of large sterically hindered substituents facilitated the incorporation of polar functional units into the polymer backbone. This study demonstrates the potential of these nickel-based catalysts for efficient copolymerization of olefin with polar monomers.
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