High-Performance Polyolefin Material: Synthesis, Properties, and Application of Poly(4-Methyl-1-pentene)

International Journal of Molecular Sciences, Journal Year: 2025, Volume and Issue: 26(2), P. 600 - 600

Published: Jan. 12, 2025

As a kind of high-performance thermoplastic crystalline resin, poly(4-methyl-1-pentene) (PMP) is characterized by its low density, dielectric constant, exceptional mechanical and chemical properties, high transparency, gas permeability. PMP has recently received more attention since COVID-19, because it used as hollow-fiber membrane for extracorporeal oxygenation (ECMO) based on permeability excellent biocompatibility. This review summarizes the structure, synthesis, application PMP. The advancements in catalyst systems catalytic synthesis PMP, including Ziegler–Natta, metallocene, post-metallocene, late-transition metal catalysts are emphasized. Furthermore, molecular chain helical conformation, crystallization morphology well properties applications, also introduced detail. Additionally, composites functional materials described promising materials.

Language: Английский

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Flexible α‐Diimine Ni(II) and Pd(II) Catalysts Featuring Backbone and Axial Cycloalkyl Substituents in Ethylene (Co)polymerization

Journal of Polymer Science, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

ABSTRACT Recently, axial flexible substituents have found widespread application in ethylene (co)polymerization catalyzed by late transition metals, yielding impressive results. In this research, we designed and synthesized a novel class of α‐diimine Ni(II) Pd(II) catalysts, distinguished their backbones that both incorporate cycloalkyl moieties. During nickel‐catalyzed polymerization, these nickel catalysts demonstrated high activity (well above 10 6 g/(mol Ni·h)) thermal stability, producing polyethylenes with very molecular weights (up to 1022 kg/mol) branching densities 103/1000C). Interestingly, the catalyst reported study exhibits higher compared classic rigid backbones. The resultant polyethylene materials exhibited outstanding mechanical properties elastic recovery (with strain (SR) up 79%), qualifying them as high‐performance thermoplastic elastomers. contrast, during palladium‐catalyzed palladium showed moderate (level 5 Pd·h)) generated 99/1000C) 203 kg/mol). case copolymerization methyl acrylate (MA), was notably reduced homopolymerization, resulting E‐MA copolymers lower densities. However, under experimental conditions, successfully obtained significant incorporation (1.53–4.54 mol%) MA. It is worth noting cyclohexyl group displayed superior chain transfer inhibition systems cyclopentyl group. Nevertheless, notable difference observed influence on density regulation: system, facilitated formation branching, while it had opposite effect when

Language: Английский

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Advances in High-Temperature Non-Metallocene Catalysts for Polyolefin Elastomers

Materials, Journal Year: 2025, Volume and Issue: 18(6), P. 1334 - 1334

Published: March 18, 2025

Despite the great successes achieved by metallocene catalysts in high-value-added polyolefin elastomer, challenging preparation conditions and undesirable high-temperature molecular weight capabilities have compromised efficiency cost of industrial production. Recently, non-metallocene received considerable attention due to their high thermostability, especially when coordinated with early transition metals. This review provides an overview these metal catalysts, which are mainly composed N,N′-, N,O-, N,S-bidentate complexes tridentate complexes. The structural characteristics, catalytic performance, advantages, disadvantages relevant as well applications, discussed. Candidates for commercialization proposed—focusing on imine-enamine, amino-quinoline, pyridine-imine catalysts—by comparing successful industrialization cases catalysts. Finally, trend research strategies address challenges limiting considered.

Language: Английский

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Effects of ancillary ligands on molecular structure and catalytic properties of tridentate α-sulfonate-β-diimine nickel complexes toward ethylene (co)polymerization

Molecular Catalysis, Journal Year: 2025, Volume and Issue: 580, P. 115136 - 115136

Published: April 16, 2025

Language: Английский

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Fluoro-enriched α-diimine nickel precatalysts for enhanced thermostability in synthesis of polyethylene elastomer

European Polymer Journal, Journal Year: 2025, Volume and Issue: unknown, P. 114004 - 114004

Published: May 1, 2025

Language: Английский

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Thermally stable C₂-Symmetric α-Diimine Nickel Precatalysts for ethylene polymerization: semicrystalline to amorphous PE with high tensile and elastic properties

Dalton Transactions, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Two sets of C 2 -symmetric α-diimine nickel complexes—nickel bromide and chloride—were investigated to simultaneously regulate chain walking, transfer, polymer microstructure in the synthesis polyethylene elastomers.

Language: Английский

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Thermally robust bis(imino)pyridyl iron catalysts for ethylene polymerization: Synergy effects of weak π-π interaction, steric bulk, and electronic tuning

Chinese Chemical Letters, Journal Year: 2024, Volume and Issue: unknown, P. 110762 - 110762

Published: Dec. 1, 2024

Language: Английский

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Special Issue: “Synthesis of Advanced Polymer Materials 2.0”

International Journal of Molecular Sciences, Journal Year: 2024, Volume and Issue: 25(23), P. 12636 - 12636

Published: Nov. 25, 2024

With the rapid evolution of polymer science, field advanced materials is experiencing remarkable growth, driven by increasing demand for versatile, high-performance [...].

Language: Английский

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Benzosuberyl-congested asymmetrical α-diiminonickel halides for achieving methyl-branched polyethylenes with tunable plastic to elastomeric properties

European Polymer Journal, Journal Year: 2024, Volume and Issue: 223, P. 113635 - 113635

Published: Dec. 10, 2024

Language: Английский

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