Cited by Heterogeneous <scp>α‐Diimine</scp> Nickel Catalysts with Improved Catalytic Performance in Ethylene Polymerization

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

Yixin Zhang, Yuxing Zhang, Xiao‐Qiang Hu

et al.

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

Citations

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

Chen Tan, Min Chen, Changle Chen

et al.

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

Published: Jan. 7, 2023

Citations

Recent advances on α-diimine Ni and Pd complexes for catalyzed ethylene (Co)polymerization: A comprehensive review DOI

Ruikai Wu, Wenyu Wu, Lucas Stieglitz

et al.

Coordination Chemistry Reviews, Journal Year: 2022, Volume and Issue: 474, P. 214844 - 214844

Published: Sept. 28, 2022

α-Diimine Ni and Pd complexes are one of the most examined late-transition organometallics in application catalyzed ethylene (co)polymerization. These organometallic catalysts provide unique advantages particular opportunities to tailor architectures, composition, topology synthesized polymers through polymerization. Two decades after their initial discovery, they still drawing extensive attention both academia industry. More recently, researchers have studied effect structural modifications on α-diimine catalytic behaviors This review highlights recent progress developments achieved last decade. The chain-walking mechanism as a behavior is also addressed. versatile synthesis ligands enables performance microstructures polyethylene. Correlations between tunes behaviors, polymer properties, copolymerization with polar monomers comparatively presented discussed. heterogenization study solid support for heterogeneous catalysis comprehensively summarized. broadly classified into four sections which includes i) coordination-insertion chemistry (co)polymerization, ii) modification ligand structure, iii) field polymerization, iv) properties polymers, followed by short summary outlook potential studies applications.

Language: Английский

Citations

A co-anchoring strategy for the synthesis of polar bimodal polyethylene DOI

Chen Zou, Quan Wang, Guifu Si

et al.

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: March 15, 2023

Since polar groups can poison the metal centers in catalysts, incorporation of comonomers usually comes at expense catalytic activity and polymer molecular weight. In this contribution, we demonstrate bimodal polyethylene as a potential solution to trade-off. The more-polar/more-branched low-molecular-weight fraction provides polarity processability, while less-polar/less-branched high-molecular-weight mechanical melt properties. To achieve high miscibility between these two fractions, three synthetic routes are investigated: mixtures homogeneous separately supported heterogeneous co-anchoring strategy (CAS) heterogenize different catalysts on one solid support. CAS route is only viable for synthesis with good level entanglement minimal phase separation. This produces polyolefin materials excellent properties, surface/dyeing gas barrier well extrudability 3D-printability.

Language: Английский

Citations

Heterogenization Strategies for Nickel Catalyzed Synthesis of Polyolefins and Composites DOI

Chen Zou, Chen Tan, Changle Chen

et al.

Accounts of Materials Research, Journal Year: 2023, Volume and Issue: 4(6), P. 496 - 506

Published: May 20, 2023

ConspectusPolyolefin is one of the most common synthetic polymers. However, polyolefins are nonpolar materials, which leads to poor compatibility with polar thus limiting their application in some fields. Polar functionalized can lead significantly improved dyeability, adhesiveness and fillers, realize customized properties polyolefin materials. Transition-metal-catalyzed coordination copolymerization olefin comonomers represents a direct potentially economic route synthesize polar-functionalized has attracted great attention recent decades. Literally hundreds nickel palladium catalysts have been synthesized investigated olefin-polar monomer achieve high efficiency by tuning molecular structures catalysts. In particular, earth-abundant low-cost nickel-based hold potential for industrial applications. research efforts focus on homogeneous catalysts, while industrially preferred heterogeneous systems remained largely unexplored. With objective bridging this gap, our group recently developed series heterogenization strategies synthesis high-performance taking advantage hydrogen bond anchoring, ionic coanchoring, cocatalyst, cluster formation. These involve known or easily accessible be adapted various catalytic systems, simultaneous enhancement all parameters such as thermal stability, activity, comonomer incorporation ratio, copolymer weight versus counterparts. addition, performance tuned changing type support, thereby facilitating discovery Most importantly, product morphology control achieved. This desirable polymerization processes because it avoids reactor fouling results significant improvements safety operational processes. Finally, these give access materials (polar-functionalized polyolefins, in-reactor blends polyolefin-based functional composites) custom-made properties. Compared melt blending, composites obtained situ better material By using prepared situ. applications many fields, electrical conductivity, photodegradation, flame retardancy, barrier, etc. It expected that continuous mechanism/catalysts, heterogenizatioin will eventually commercialization nickel-catalyzed production composites.

Language: Английский

Citations

Outer‐Shell Self‐Supported Nickel Catalysts for the Synthesis of Polyolefin Composites DOI

Jie Li, Dan Peng, Chen Tan

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(18)

Published: March 3, 2023

In situ heterogeneous olefin polymerization has attracted much attention for the synthesis of polyolefin composites. However, complicated syntheses specially designed catalysts or detrimental effects interactions between catalyst and solid supports pose great challenges. this contribution, an outer-shell self-supporting strategy was to heterogenize nickel on different fillers via precipitation homopolymerization ionic cluster type polar monomer. These demonstrated high activity, good product morphology control, stable performances in ethylene copolymerization. Moreover, various composites with mechanical customized properties can be efficiently synthesized.

Language: Английский

Citations

Light, Heat, and Force‐Responsive Polyolefins DOI

Weicheng Qu,

Zhengxing Bi,

Chen Zou

et al.

Advanced Science, Journal Year: 2024, Volume and Issue: 11(11)

Published: Jan. 6, 2024

Abstract Stimuli‐responsive polymers have found applications as shape‐memory materials, optical switches, and sensors, but the installation of these responsive properties in non‐polar inert polyolefins is challenging. In this contribution, a series spiropyran (SP)‐based comonomers are synthesized copolymerized with ethylene or ethylene/cyclic monomers. addition to great mechanical surface properties, functionalized responded light, heat, force, which induced changes polymer structure transmit color signals. These interesting also installed commercial polyolefin materials through reactive extrusion, making scalable production possible.

Language: Английский

Citations

Heterogeneous Nickel Catalysts for the Synthesis of Ethylene-Based Polyolefin Elastomers DOI

Zhengxing Bi,

Jiangjun Zhou,

Ningning Zhu

et al.

Macromolecules, Journal Year: 2024, Volume and Issue: 57(3), P. 1080 - 1086

Published: Feb. 1, 2024

Ethylene-based polyolefin elastomers (EPOEs) represent a novel class of material prepared using ethylene as the only feedstock and bear comparable mechanical elastic properties versus traditional (POEs). EPOEs are from late-transition-metal (nickel or palladium)-catalyzed chain walking polymerization ethylene. However, literature-reported potent catalysts homogeneous systems that operate at relatively low temperatures (<90 °C), while industrial production POE materials requires high (>120 °C). In this contribution, we install some OM (M = H, Na, K) tags in an α-diimine ligand framework, enabling facile heterogenization nickel complexes onto MgCl2-based solid support. The resulting heterogeneous highly active demonstrate much better thermal stability (up to 150 °C) than their counterparts. More importantly, polyethylene products super-stretchability 2160%) maintaining tensile strength 15.4 MPa) elasticity (strain recovery value up 83%). These EPOE can also be used toughen polypropylene, well compatibilize blends polypropylene.

Language: Английский

Citations

Synthesis of Polar-functionalized Isotactic Polypropylenes Using Commercial Heterogeneous Ziegler–Natta Catalyst DOI

Yu Wang, Quan Wang, Chen Tan

et al.

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(10), P. 6837 - 6845

Published: March 1, 2024

The efficient synthesis of polar-functionalized polypropylenes with high molecular weight and stereoregularity represents a challenging task. This challenge becomes even more daunting when pursuing an industrially preferred heterogeneous process. study demonstrated the realization these goals through use commercial Ziegler–Natta catalysts in copolymerization propylene ionic cluster polar monomers. results revealed activity (∼1.1 × 107 g mol–1 h–1), moderate monomer incorporation ratios (∼4.9 mol %), copolymer (Mw > 105 mol–1), ([mmmm] ∼ 96%), melting temperature range (150–162 °C). utilization monomers improved thermal stability as well stereoselectivity catalyst. Moreover, catalyst can homopolymerize activities (>104 h–1). resulting isotactic (iPP) exhibited superior tensile strength, impact creep resistance, transparency, crystallinity compared nonpolar iPP. enhancement was attributable to dual roles unit, serving both transparent nucleating agent dynamic cross-linking functionality. Furthermore, iPP compatibility materials, offering benefits for applications composites, recycling mixed plastic wastes, 3D printing, other fields. offered comprehensive solution future industrial production via copolymerization, bridging gap between practical process from synthetic chemistry perspective enhanced material properties application perspective.

Language: Английский

Citations

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

Wenbing Wang, Quan Wang, Chen Zou

et al.

Precision Chemistry, Journal Year: 2024, Volume and Issue: 2(2), P. 63 - 69

Published: Jan. 11, 2024

Ultra-high-molecular-weight polyethylene (UHMWPE) plays an important role in many 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 (

Language: Английский

Citations