Facile access to diverse polyethylenes<i>via</i>neutral salicylaldiminato nickel catalysts

Li, Qiankun; Mu, Hongliang; Jian, Zhongbao

doi:10.1039/d3py00450c

Cited by 8 publications

(3 citation statements)

References 53 publications

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“…The trinuclear nickel(II) precursor Ni 3 – Br was prepared via the reaction of tribenzyl bromide (1 equiv) with Ni(COD) 2 (3 equiv) in the presence of excess PMe 3 (Figure ). In addition, we further chose the salicylaldimine compound as the ligand because the related salicylaldiminato nickel(II) catalysts enabled the synthesis of UHMWPE through a living polymerization fashion reported by us recently. − Treating Ni 3 – Br (1 equiv) with the ligand sodium salt (3 equiv) resulted in the formation of the trinuclear nickel(II) catalyst Ni 3 (Figure ). Similarly, the tetranuclear nickel(II) precursors Ni 4 * – Br and Ni 4 – Br were also prepared.…”

Section: Resultsmentioning

confidence: 99%

Star Ultrahigh-Molecular-Weight Polyethylene

Wang,

Wu,

Chen

et al. 2023

Macromolecules

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Star polymers have attracted immense interest from scientific and industrial communities due to their unique properties relative to linear polymers; however, the synthesis of the long-sought star polyolefins remains highly challenging because of the lack of desired catalysts. Herein, we report the synthesis of tri- and tetranuclear neutral salicylaldiminato nickel(II) catalysts through well-defined multinuclear nickel(II) precursors rather than multisite ligands. A one-step and clean synthesis of three-arm and four-arm star polyethylenes without tedious purification via the core-first approach is accomplished by these nickel(II) catalysts. These star polyethylenes possess ultrahigh molecular weights of 1432–2370 kDa, very narrow molecular weight distributions of M w/M n = 1.30–1.39, substantially linear arms of 1.7–3.0 branches/1000C, and excellent mechanical properties. As a result, star ultrahigh-molecular-weight polyethylene has become a new member of the family of polyolefins.

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Section: Resultsmentioning

confidence: 99%

Star Ultrahigh-Molecular-Weight Polyethylene

Wang,

Wu,

Chen

et al. 2023

Macromolecules

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“…Nevertheless, despite their good performance in copolymerization processes, the high cost and relatively low activity of Pd catalysts severely restrict their practical utility. In contrast, nickel catalysts are more appealing for industrial applications due to their greater economy, larger earth abundance, and higher catalytic activity in ethylene homopolymerization [ 35 , 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Nickel Catalysts with Industrial Exploitability for Copolymerization of Ethylene with Polar Monomers

Wang,

Lai,

Gao

et al. 2024

Polymers

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The direct copolymerization of ethylene with polar monomers to produce functional polyolefins continues to be highly appealing due to its simple operation process and controllable product microstructure. Low-cost nickel catalysts have been extensively utilized in academia for the synthesis of polar polyethylenes. However, the development of high-temperature copolymerization catalysts suitable for industrial production conditions remains a significant challenge. Classified by the resultant copolymers, this review provides a comprehensive summary of the research progress in nickel complex catalyzed ethylene-polar monomer copolymerization at elevated temperatures in the past five years. The polymerization results of ethylene–methyl acrylate copolymers, ethylene-tert–butyl acrylate copolymers, ethylene–other fundamental polar monomer copolymers, and ethylene–special polar monomer copolymers are thoroughly summarized. The involved nickel catalysts include the phosphine-phenolate type, bisphosphine-monoxide type, phosphine-carbonyl type, phosphine-benzenamine type, and the phosphine-enolate type. The effective modulation of catalytic activity, molecular weight, molecular weight distribution, melting point, and polar monomer incorporation ratio by these catalysts is concluded and discussed. It reveals that the optimization of the catalyst system is mainly achieved through the methods of catalyst structure rational design, extra additive introduction, and single-site catalyst heterogenization. As a result, some outstanding catalysts are capable of producing polar polyethylenes that closely resemble commercial products. To achieve industrialization, it is essential to further emphasize the fundamental science of high-temperature copolymerization systems and the application performance of resultant polar polyethylenes.

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“…1–7 Among these, nickel catalysts are considered to have more potential for industrialization due to their greater economic and environmental advantages compared to palladium. 8–11 Therefore, a series of nickel catalysts with different ligand structures are constantly emerging; 12–17 for example, representative nickel catalysts such as α-diimine nickel catalysts, 18–20 α-imino-ketone nickel catalysts 21 and salicylaldehyde imine nickel catalysts 22–24 have been widely studied.…”

Section: Introductionmentioning

confidence: 99%

Lewis acid modulation in phosphorus phenol nickel catalyzed ethylene polymerization and copolymerization

Wang,

Nie,

et al. 2023

Polym. Chem.

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Facile access to diverse polyethylenesvianeutral salicylaldiminato nickel catalysts

Abstract: A new family of neutral salicylaldiminato nickel(II) catalysts (Ni1-Ni5) with various well-designed substituents ortho to the phenoxy moiety is developed, which shows moderate to high catalytic activity for ethylene polymerization...

Cited by 8 publications

References 53 publications

Star Ultrahigh-Molecular-Weight Polyethylene

Star Ultrahigh-Molecular-Weight Polyethylene

Recent Advances in Nickel Catalysts with Industrial Exploitability for Copolymerization of Ethylene with Polar Monomers

Lewis acid modulation in phosphorus phenol nickel catalyzed ethylene polymerization and copolymerization

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