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Thermostable α-Diimine Nickel Complexes with Substituents on Acenaphthequinone-backbone for Ethylene Polymerization

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Abstract

In order to promote the thermostability of α-diimine nickel complex by ligand backbone structure, a series of α-diimine nickel complexes with substituents on acenaphthequinone backbone were synthesized and used as catalysts for ethylene polymerization. When the hydroxyethyl phenoxyl group was introduced to the acenaphthequinone-backbone, the thermal stability and activity of the catalyst could be significantly improved. The catalytic activity of complex C2 [5-(4-(2-hydroxyethyl)phenoxyl)-N,N-bis(2,6-diisopropyl)acenaphthylene-1,2-diimine]nickel(II) dibromide with isopropyl substituents on N-aryl reached 8.2 × 106 g/(molNi·h) at 70 °C and 2 MPa. The activity of [5-(4-(2-hydroxyethyl)phenoxyl)-N,N-bis(2,6-dibenzhydryl-4-menthylphenyl)acenaphthylene-1,2-diimine]nickel(II) dibromide (C3) still maintained at 6.7 × 105 g/(molNi·h) at 120 °C. Compared with C3 containing bulky dibenzhydryl substituents, the activity of C2 was sensitive to the change of the polymerization pressure. However, the polyethylenes obtained from complex C3 had lower branching density. Meanwhile, the molecular weight could reach 971 kg/mol, which is almost 5 times as much as that of the polyethylene obtained from complex C2.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 21004017 and 21004043) and the Natural Science Foundation of Hebei Province (No. B2015202049).

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Authors and Affiliations

  1. Hebei Key Laboratory of Functional Polymers, Tianjin Key Laboratory of Chemical Process Safety, Institute of Polymer Science and Engineering, Hebei University of Technology, Tianjin, 300130, China

    Rui-Fang Zhang, Ding-Ding Zhao, Mi-Mi Cui, Xiang-Liu Li, Bin-Yuan Liu & Min Yang

  2. State Key Laboratory of Separation Membranes and Membrane Processes, School of Material Science and Engineering, Tiangong University, Tianjin, 300160, China

    Yan-Hui Hou & Fei-Fan Zhai

  3. Lanzhou Petrochemical Research Center, Petrochemical Research Institute of CNPC, Lanzhou, 730060, China

    Xu-Ling Wei

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  1. Rui-Fang Zhang
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  2. Yan-Hui Hou
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Correspondence to Yan-Hui Hou or Min Yang.

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Zhang, RF., Hou, YH., Wei, XL. et al. Thermostable α-Diimine Nickel Complexes with Substituents on Acenaphthequinone-backbone for Ethylene Polymerization. Chin J Polym Sci 38, 1214–1220 (2020). https://doi.org/10.1007/s10118-020-2430-x

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  • DOI: https://doi.org/10.1007/s10118-020-2430-x

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