Nickel(Ⅱ) Complexes Containing RCOO-Substituent as Highly Active Single-Component Catalysts for Ethylene (Co)Polymerization

doi:10.11944/j.issn.1000-0518.2018.01.170031

Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (1): 89-101.DOI: 10.11944/j.issn.1000-0518.2018.01.170031

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Nickel(Ⅱ) Complexes Containing RCOO-Substituent as Highly Active Single-Component Catalysts for Ethylene (Co)Polymerization

LI Weiwei^a^b,MU Hongliang^a^*(),LIU Jingyu^a,LI Yuesheng^c

^aState Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
^bUniversity of Chinese Academy of Sciences,Beijing 100049,China
^cSchool of Material Science and Engineering,Tianjin University,Tianjin 300072,China

Received:2017-02-13 Accepted:2016-03-27 Published:2018-01-03 Online:2018-01-03
Contact: MU Hongliang
Supported by:
Supported by the National Natural Science Foundation of China(No.21304087)

Abstract

Abstract:

Mononuclear nickel complexes [(2,6-R₂-C₆H₃)—N=C(H)—(3-Ph-5-PhCOO-2-O-C₆H₂)-κ²-N,O]Ni(CH₃)(pyridine)](R=iPr; 3,5-tBu₂C₆H₃)(Ni¹~Ni²) and binuclear nickel complex(Ni³) were synthesized, characterized and applied in ethylene (co)polymerization. As single-component catalysts, all these complexes are capable of converting ethylene to branched polyethylenes(PE) with moderate relative molecular mass. The electron-donating group PhCOO— facilitates the initiation of catalyst Ni¹, leading to better catalytic activity at low temperature compared to nickel methyl pyridine comples(Ni⁰). Introducing bulky 2,6-(3,5-(t-Bu)₂C₆H₃)₂C₆H₃N— moiety, the activities of Ni² up to 1.8×10⁶ g of PE mol^-1·Ni^-1·h^-1(at 5×10⁵ Pa ethylene) were among the highest values using phenoxyiminato neutral nickel catalysts. Binuclear catalyst Ni³ showes better tolerance toward PPh₃ donor additive than its mononuclear counterpart. In the presence of comonomers 1,5-hexadiene, 1,7-octadiene, 6-bromo-1-hexene, or methyl 10-undecenoate, these catalysts effectively enchain these comonomers into the polymer chain to give functionalized polyethylenes.

Key words: neutral nickel catalysts, electronic effects, olefin polymerization, functionlized polyolefin

LI Weiwei,MU Hongliang,LIU Jingyu,LI Yuesheng. Nickel(Ⅱ) Complexes Containing RCOO-Substituent as Highly Active Single-Component Catalysts for Ethylene (Co)Polymerization[J]. Chinese Journal of Applied Chemistry, 2018, 35(1): 89-101.

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Nickel(Ⅱ) Complexes Containing RCOO-Substituent as Highly Active Single-Component Catalysts for Ethylene (Co)Polymerization

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