Recent Trends in Catalytic Polymerizations

ACS Catalysis, Год журнала: 2019, Номер 9(12), С. 11153 - 11188

Опубликована: Ноя. 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.

Язык: Английский

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

Chemical Science, Год журнала: 2019, Номер 10(38), С. 8724 - 8734

Опубликована: Янв. 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.

Язык: Английский

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Polyethylene materials with in-chain ketones from nonalternating catalytic copolymerization

Science, Год журнала: 2021, Номер 374(6567), С. 604 - 607

Опубликована: Окт. 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.

Язык: Английский

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Recent advances in nickel mediated copolymerization of olefin with polar monomers

Coordination Chemistry Reviews, Год журнала: 2021, Номер 435, С. 213802 - 213802

Опубликована: Фев. 14, 2021

Язык: Английский

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

Angewandte Chemie International Edition, Год журнала: 2020, Номер 59(34), С. 14296 - 14302

Опубликована: Май 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

Язык: Английский

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

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Апрель 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.

Язык: Английский

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

Macromolecules, Год журнала: 2022, Номер 55(6), С. 1910 - 1922

Опубликована: Март 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

Язык: Английский

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

Progress in Polymer Science, Год журнала: 2023, Номер 143, С. 101713 - 101713

Опубликована: Июнь 25, 2023

Язык: Английский

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

ACS Catalysis, Год журнала: 2022, Номер 12(22), С. 14304 - 14320

Опубликована: Ноя. 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.

Язык: Английский

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

Trends in Chemistry, Год журнала: 2023, Номер 5(2), С. 147 - 159

Опубликована: Янв. 7, 2023

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