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

Wang, Wenbing; Nie, Nan; Xu, Menghe; Zou, Chen

doi:10.1039/d3py00925d

Cited by 6 publications

(8 citation statements)

References 46 publications

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“…These UHMWPEs showed excellent mechanical properties, with an outstanding Young’s modulus of up to 356.9 MPa, tensile strength of up to 51.0 MPa, and strain values in the range of 210–350%. These UHMWPE samples exhibited higher stress compared to polyethylene prepared using commonly reported phosphonate nickel catalysts, further reflecting the advantages of precipitation polymerization strategies. , …”

Section: Resultsmentioning

confidence: 73%

“…These UHMWPE samples exhibited higher stress compared to polyethylene prepared using commonly reported phosphonate nickel catalysts, further reflecting the advantages of precipitation polymerization strategies. 35,45…”

Section: Mechanical Properties Of Uhmwpementioning

confidence: 99%

“…Early transition metal catalysts have been the key players in the synthesis of UHMWPE, which demonstrate an extremely high chain propagation/chain transfer (or chain termination) ratio (>3.5 × 10 4 ). − Recently, some nickel catalysts with specially designed ligands have emerged as an alternative system to access UHMWPE, along with the added benefits of their low oxophilicity and polar monomer copolymerization capability. − Phosphino-phenolate nickel catalysts possess outstanding polar monomer copolymerization ability, along with the disadvantage of high chain transfer tendency leading to low polymer molecular weight. − Recently, Li and co-workers demonstrated that phosphino-phenolate nickel catalysts (A, Scheme ) and phosphino-naphtholate nickel catalysts (B, Scheme ) bearing bulky substituents can efficiently inhibit chain transfer and produce polyethylene with M n of up to 4.8 × 10 5 g mol –1 . , Shimizu’s group and Agapie’s group have both reported similar observations. However, these homogeneous phosphino-phenolate nickel catalysts have not been found to be able to generate UHMWPE.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Ultra-High-Molecular-Weight Polyethylene by Transition-Metal-Catalyzed Precipitation Polymerization

Wang,

Zou

et al. 2024

Precision Chemistry

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Ultra-high-molecular-weight polyethylene (UHMWPE) plays an important role in many important fields as engineering plastics. In this contribution, a precipitation polymerization strategy is developed by combination of highly active phosphino-phenolate nickel catalysts with polymer-insoluble solvent (heptane) to access UHMWPE (M n up to 8.3 × 10 6 g mol −1 ) with good product morphology, free-flowing characteristics, and great mechanical properties. Compared with the academically commonly used aromatic solvent (toluene), the utilization of heptane offers simultaneous enhancement in important parameters including activity, polymer molecular weight, and catalyst thermal stability. This system can also generate polar functionalized UHMWPE with molecular weight of up to 1.6 × 10 6 g mol −1 in the copolymerization of ethylene with polar comonomers. More importantly, this precipitation polymerization strategy is generally applicable to several representative transition metal catalyst systems, leading to UHMWPE synthesis with good product morphology control.

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Section: Resultsmentioning

confidence: 73%

Section: Mechanical Properties Of Uhmwpementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of Ultra-High-Molecular-Weight Polyethylene by Transition-Metal-Catalyzed Precipitation Polymerization

Wang,

Zou

et al. 2024

Precision Chemistry

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“…Moreover, another method for achieving cation-tunable polymerization was realized by assigning the coordinated N atom to the ligand. Zou et al designed and synthesized a phosphine-phenolate Ni catalyst 11 with a nitrogen atom on the phosphine side of the ligand [ 74 ]. Catalyst 11 generated MA-functionalized polyethylenes with moderate catalytic activity, high molecular weight, and low MA incorporation ratio ( Table 1 , Entry 25).…”

Section: Nickel Catalysts For Synthesizing Ema Copolymersmentioning

confidence: 99%

“…The aluminum atom of Al(O i Pr) 3 is likely weakly coordinated by ether groups in catalyst 13 . In addition, the phosphine-phenolate Ni catalyst 11 with Lewis acid modulation properties was also utilized for ethylene and tBA copolymerization with good performance ( Table 2 , Entry 4) [ 74 ].…”

Section: Nickel Catalysts For Synthesizing Etba Copolymersmentioning

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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Electronic effect regulated ethylene polymerization and copolymerization of phosphorus phenol nickel catalysts

Xie,

Yang,

Miao

et al. 2024

Applied Organom Chemis

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In recent years, phosphorus phenol nickel catalysts with excellent polar monomer copolymerization performance have flourished. A series of phosphorus phenol nickel catalysts based on adjusting spatial hindrance have been designed and synthesized for ethylene polymerization and copolymerization. In this paper, a series of phosphorus phenol nickel catalysts with different para electronic effects have been designed from the perspective of electronic effects, and the effects of these phosphorus phenol nickel catalysts with different electronic effects on ethylene polymerization and copolymerization have been studied. And we found that these nickel catalysts with para electron donating groups have higher catalytic activity (the highest activity can reach 6.2 × 106 gPE molNi−1 h−1) and prepared polymers with higher molecular weight (molecular weight up to 4.9 × 105 gPE molNi−1) compared to electron withdrawing groups.

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

Abstract: Recently, the phosphorus phenol nickel catalysts have attracted widespread attention from the academic community due to their excellent copolymerization performance. Here, a series of phosphorus phenol nickel catalysts containing N...

Cited by 6 publications

References 46 publications

Synthesis of Ultra-High-Molecular-Weight Polyethylene by Transition-Metal-Catalyzed Precipitation Polymerization

Synthesis of Ultra-High-Molecular-Weight Polyethylene by Transition-Metal-Catalyzed Precipitation Polymerization

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

Electronic effect regulated ethylene polymerization and copolymerization of phosphorus phenol nickel catalysts

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