Ultrahigh Molecular Weight Ethylene–Acrylate Copolymers Synthesized with Highly Active Neutral Nickel Catalysts

Angewandte Chemie International Edition, Journal Year: 2025, Volume and Issue: unknown

Published: March 6, 2025

Molecular weight is a crucial parameter in catalytic olefin polymerization to determine the thermomechanical properties of polymers. Elevating molecular ethylene-acrylate copolymer, typical polar polyolefin has been persistent challenge. This study presents direct synthesis ultrahigh (UHMW) copolymers using highly active, neutral, single-component phosphine-phenolate nickel catalyst under mild conditions. The coordination-insertion copolymerization ethylene and various acrylates, such as methyl acrylate, n-butyl t-butyl can yield with UHMWs (Mn) ranging from 1000 2700 kDa, exceptional activities up 4.03 × 106 g mol-1 h-1. A relatively large-scale (30-50 g) UHMW was notably achieved. these were comprehensively evaluated, demonstrating that retained bulk polyethylene (UHMWPE) while exhibiting improved surface dyeing properties. In particular, tensile strength significantly increased higher weights, reaching 44 MPa (147 after predrawing ratio 3.1), which comparable UHMWPE.

Language: Английский

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Ultrahigh Molecular Weight Ethylene–Acrylate Copolymers Synthesized with Highly Active Neutral Nickel Catalysts

Angewandte Chemie, Journal Year: 2025, Volume and Issue: unknown

Published: March 6, 2025

Abstract Molecular weight is a crucial parameter in catalytic olefin polymerization to determine the thermomechanical properties of polymers. Elevating molecular ethylene–acrylate copolymer, typical polar polyolefin has been persistent challenge. This study presents direct synthesis ultrahigh (UHMW) copolymers using highly active, neutral, single‐component phosphine‐phenolate nickel catalyst under mild conditions. The coordination‐insertion copolymerization ethylene and various acrylates, such as methyl acrylate, n ‐butyl t can yield with UHMWs ( M ) ranging from 1000 2700 kDa, exceptional activities up 4.03 × 10 6 g mol −1 h . A relatively large‐scale (30–50 g) UHMW was notably achieved. these were comprehensively evaluated, demonstrating that retained bulk polyethylene (UHMWPE) while exhibiting improved surface dyeing properties. In particular, tensile strength significantly increased higher weights, reaching 44 MPa (147 after predrawing ratio 3.1), which comparable UHMWPE.

Language: Английский

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Monomeric M(II) (M = Fe, Co, Ni) complexes supported by bulky aryloxide ligands tethered to an arene functionality; synthesis, electrochemistry and study of the M(II)-arene interaction.

Dalton Transactions, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Strength of M–arene interaction (2-Ni) ≫ (2-Co) > (2-Fe), IR spectroscopy to probe interaction, THF coordination completely disturbs interaction.

Language: Английский

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

Polymers, Journal Year: 2024, Volume and Issue: 16(12), P. 1676 - 1676

Published: June 12, 2024

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

Language: Английский

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Optimizing the Cation Binding Pocket in Nickel Phenoxyimine Catalysts Improves Ethylene Polymerization Efficiency

Organometallics, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 17, 2024

Language: Английский

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