Recent Trends in Catalytic Polymerizations

ACS Catalysis, Journal Year: 2019, Volume and Issue: 9(12), P. 11153 - 11188

Published: Nov. 8, 2019

Polymers have become one of the largest and most important materials we use in daily life. Their popularity has stemmed from their wide range material properties combined with low cost production. Both these attractive traits part been enabled by development catalytic polymerizations, which provide both high levels control while also delivering productivity. In this Perspective, highlight recent trends achievements made growing field polymerizations.

Language: Английский

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Tailoring polymer dispersity and shape of molecular weight distributions: methods and applications

Chemical Science, Journal Year: 2019, Volume and Issue: 10(38), P. 8724 - 8734

Published: Jan. 1, 2019

The width and shape of molecular weight distributions can significantly affect the properties polymeric materials thus are key parameters to control. This mini-review aims critically summarise recent approaches developed tailor highlights strengths limitations each technique. Special emphasis will also be given applications where tuning distribution has been used as a strategy not only enhance polymer but increase fundamental understanding behind complex mechanisms phenomena.

Language: Английский

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Polyethylene materials with in-chain ketones from nonalternating catalytic copolymerization

Science, Journal Year: 2021, Volume and Issue: 374(6567), P. 604 - 607

Published: Oct. 28, 2021

The world’s most abundantly manufactured plastic, polyethylene, consists of inert hydrocarbon chains. introduction reactive polar groups in these chains could help overcome problematic environmental persistence and enhance compatibility with other materials. We show that phosphinophenolate-coordinated nickel complexes can catalyze nonalternating copolymerization ethylene carbon monoxide to incorporate a low density individual in-chain keto polyethylene high molecular weight while retaining desirable material properties. After processing by conventional injection molding techniques, tensile properties remain on par those standard high-density also imparting photodegradability.

Language: Английский

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Recent advances in nickel mediated copolymerization of olefin with polar monomers

Coordination Chemistry Reviews, Journal Year: 2021, Volume and Issue: 435, P. 213802 - 213802

Published: Feb. 14, 2021

Language: Английский

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Ultrahigh Branching of Main‐Chain‐Functionalized Polyethylenes by Inverted Insertion Selectivity

Angewandte Chemie International Edition, Journal Year: 2020, Volume and Issue: 59(34), P. 14296 - 14302

Published: May 22, 2020

Branched polyolefin microstructures resulting from so-called "chain walking" are a fascinating feature of late transition metal catalysts; however, to date it has not been demonstrated how desirable branched can be generated thereby. We demonstrate highly polyethylenes with methyl branches (220 Me/1000 C) exclusively and very high molecular weights (ca. 10

Language: Английский

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A general strategy for heterogenizing olefin polymerization catalysts and the synthesis of polyolefins and composites

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: April 12, 2022

The heterogenization of homogeneous metal complexes on solid supports presents an efficient strategy for bridging catalysts with industrially-preferred heterogeneous catalysts; however, a series drawbacks restrict their implementation in olefin polymerization, particularly copolymerization polar comonomers. In this contribution, we report ionic anchoring that is highly versatile, generally applicable to different systems, and enables strong catalyst-support interactions while tolerating various functional groups. addition greatly enhanced polymerization properties, the supported achieved higher comonomer incorporation than unsupported counterparts. This enabled at high temperatures large scale great control over product morphology, facile synthesis polyolefin composites. More importantly, dispersion fillers matrix produced material properties even low composite loadings. It expected will find applications catalytic systems advanced engineering materials.

Language: Английский

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Material Properties of Functional Polyethylenes from Transition-Metal-Catalyzed Ethylene–Polar Monomer Copolymerization

Macromolecules, Journal Year: 2022, Volume and Issue: 55(6), P. 1910 - 1922

Published: March 1, 2022

Polyethylenes enjoy wide applications due to their many superior properties. The incorporation of some polar functional groups into the otherwise nonpolar polyethylene backbone can significantly improve important properties and further broaden applications. During past few decades, catalyst systems have been demonstrated with capabilities copolymerizing ethylene monomers. As a result, numerous functionalized polyethylenes prepared bearing various groups. However, studies material from transition-metal-catalyzed ethylene–polar monomer copolymerization not received much attention until recently. After brief discussions selected examples potent catalysts suitable monomers, this Perspective summarizes recent advances in improvements surface compatibilities (hydrophilicity, adhesion, dyeability, compatibility other types polymers) induced through group as well custom-made such elastic, flame-retardant, antibacterial, antioxidant, cross-linking, self-healing, light response, dynamic photodegradation

Language: Английский

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Sustainable developments in polyolefin chemistry: Progress, challenges, and outlook

Progress in Polymer Science, Journal Year: 2023, Volume and Issue: 143, P. 101713 - 101713

Published: June 25, 2023

Language: Английский

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Advances on Controlled Chain Walking and Suppression of Chain Transfer in Catalytic Olefin Polymerization

ACS Catalysis, Journal Year: 2022, Volume and Issue: 12(22), P. 14304 - 14320

Published: Nov. 7, 2022

Precise synthesis of the complex polymer structure has been long-sought. In late transition-metal catalyzed olefin polymerization, chain walking and transfer are two important processes that affect architectures, molecular weights distributions, respectively. However, both uncontrolled presence make it difficult to precisely synthesize desired polyolefin materials. How address these key events is a long-standing challenge. This Perspective highlights advances on controlled suppression reactions in late-transition-metal-mediated polymerization prepare well-defined polyolefins. Fruitful catalyst strategies versatile techniques powerful tools accomplish elusive control over architectures.

Language: Английский

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‘Catalyst + X’ strategies for transition metal-catalyzed olefin-polar monomer copolymerization

Trends in Chemistry, Journal Year: 2023, Volume and Issue: 5(2), P. 147 - 159

Published: Jan. 7, 2023

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