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

Metal–organic framework (MOF) materials as polymerization catalysts: a review and recent advances DOI
Timothy A. Goetjen, Jian Liu, Yufang Wu

et al.

Chemical Communications, Journal Year: 2020, Volume and Issue: 56(72), P. 10409 - 10418

Published: Jan. 1, 2020

Metal–organic frameworks are versatile materials that provide new opportunities as catalysts in polymerization reactions, including modularity and well-defined structures.

Language: Английский

Citations

250
Waste to Wealth: Chemical Recycling and Chemical Upcycling of Waste Plastics for a Great Future DOI
Huan Chen, Kun Wan, Yayun Zhang

et al.

ChemSusChem, Journal Year: 2021, Volume and Issue: 14(19), P. 4123 - 4136

Published: May 17, 2021

Abstract The linear approach to resource utilization has led the accumulation of waste plastic in environment for decades. Unfortunately, both traditional mechanical recycling and incineration have faced their bottlenecks that always resulted quality deterioration value recovery failures. Recently, chemical upcycling processes, including conversion plastics into virgin monomers, liquid fuels, or feedstocks produce value‐added products, been identified as most promising strategy recovering from plastics. However, these methods are often cost prohibitive relying on stringent conditions compared current methods. Accordingly, this Minireview summarizes recent trends achievements We highlight three research topics: depolymerization monomers; degradation fuels waxes; hydrogen, fine feedstocks, functional materials. Indeed, is a bright path circular environmentally friendly economy.

Language: Английский

Citations

245
100th Anniversary of Macromolecular Science Viewpoint: Redefining Sustainable Polymers DOI Creative Commons
Danielle E. Fagnani, Jessica L. Tami, Graeme Copley

et al.

ACS Macro Letters, Journal Year: 2020, Volume and Issue: 10(1), P. 41 - 53

Published: Dec. 17, 2020

Although Staudinger realized makromoleküles had enormous potential, he likely did not anticipate the consequences of their universal adoption. With 6.3 billion metric tons plastic waste now contaminating our land, water, and air, we are facing an environmental public health crisis. Synthetic polymer chemists can help create a more sustainable future, but on right path to do so? Herein, comprehensive literature survey reveals that there has been increased focus "sustainable polymers" in recent years, most papers biomass-derived feedstocks. In contrast, is less end-of-life fates. Moving forward, suggest emphasis chemical recycling, which sees value promotes closed-loop economy. To keep us sustainability, synthetic community should routinely seek systems perspective offered by life cycle assessment.

Language: Английский

Citations

243
Progress and perspective for conversion of plastic wastes into valuable chemicals DOI
Kai Zheng, Yang Wu,

Zexun Hu

et al.

Chemical Society Reviews, Journal Year: 2022, Volume and Issue: 52(1), P. 8 - 29

Published: Dec. 5, 2022

We divide the up-to-date techniques into two categories: technologies executed under violent conditions and mild conditions, we present a timely summary of mechanism bond cleavage in plastic waste to produce valuable chemicals.

Language: Английский

Citations

210
Polyolefin thermoplastic elastomers from polymerization catalysis: Advantages, pitfalls and future challenges DOI
Giorgia Zanchin, Giuseppe Leone

Progress in Polymer Science, Journal Year: 2020, Volume and Issue: 113, P. 101342 - 101342

Published: Dec. 17, 2020

Language: Английский

Citations

206
Understanding the Structure–Activity Relationships in Catalytic Conversion of Polyolefin Plastics by Zeolite-Based Catalysts: A Critical Review DOI

Zhongwen Dong,

Wenjun Chen,

Keqing Xu

et al.

ACS Catalysis, Journal Year: 2022, Volume and Issue: 12(24), P. 14882 - 14901

Published: Nov. 23, 2022

Polyolefins, the largest used commodity plastics in world, find extensive application many fields. However, most end up landfills or incineration, leading to severe ecological crises, environmental pollution, and serious resource waste problems. As representatives on chemical upcycling of polyolefin fuels bulk/fine chemicals, catalytic cracking hydrocracking based zeolite metal/zeolite composite catalysts are considered effective paths due their large capacity strong adaptability existing petrochemical equipment. After an overview reaction mechanisms pyrolysis cracking, this review aims comprehensively discuss influence catalyst structure (acidity, pore structure, morphology) activity, selectivity, stability particularly emphasizing importance for matching acidity target product formation. Subsequently, structure–activity relationship between metal site zeolite's acid is also discussed. In end, emerging opportunities challenges proposed promote a more efficient way upcycling.

Language: Английский

Citations

121
Linear Block Copolymer Synthesis DOI
Huong Dau, Glen R. Jones,

Enkhjargal Tsogtgerel

et al.

Chemical Reviews, Journal Year: 2022, Volume and Issue: 122(18), P. 14471 - 14553

Published: Aug. 12, 2022

Block copolymers form the basis of most ubiquitous materials such as thermoplastic elastomers, bridge interphases in polymer blends, and are fundamental for development high-performance materials. The driving force to further advance these is accessibility block copolymers, which have a wide variety composition, functional group content, precision their structure. To broaden application will depend on nature combined segmented blocks, guided through combination polymerization techniques reach high versatility copolymer architecture function. This review provides comprehensive overview prepare linear intended serve guideline how can work together result desired combinations. As give an account relevant procedures access areas, sections include orthogonal approaches or sequentially techniques, increases synthetic options

Language: Английский

Citations

116
A general strategy for heterogenizing olefin polymerization catalysts and the synthesis of polyolefins and composites DOI Creative Commons
Chen Zou, Guifu Si, Changle Chen

et al.

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

Citations

110
An Ionic Cluster Strategy for Performance Improvements and Product Morphology Control in Metal-Catalyzed Olefin–Polar Monomer Copolymerization DOI
Chen Tan, Chen Zou, Changle Chen

et al.

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(5), P. 2245 - 2254

Published: Jan. 24, 2022

Product morphology control represents a critical challenge for polyolefin production, but it has remained largely unexplored in the field of ethylene-polar monomer copolymerization. Herein, an ionic cluster strategy was designed to product during synthesis polar-functionalized polyolefins via precipitation polymerization. In addition control, simultaneous improvements catalytic copolymerization performance (activities, copolymer molecular weights, and comonomer incorporation ratios) were achieved. These results due less poisoning metal-salt-based comonomers compared with their ester counterparts high local concentration alkene induced by formation. Moreover, is generally applicable various systems, greatly enhances catalyst's thermal stability at temperatures (90-150 °C), enables homopolymerization both terminal internal olefins. Finally, composites (generated from tandem process combining prepolymerization step subsequent polymerization) developed, which showed tunable mechanical properties great potential as compatibilizing agents mixtures other types polymers.

Language: Английский

Citations

81
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

76