New Advances in Covalent Network Polymers via Dynamic Covalent Chemistry

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(12), P. 7829 - 7906

Published: June 3, 2024

Covalent network polymers, as materials composed of atoms interconnected by covalent bonds in a continuous network, are known for their thermal and chemical stability. Over the past two decades, these have undergone significant transformations, gaining properties such malleability, environmental responsiveness, recyclability, crystallinity, customizable porosity, enabled development integration dynamic chemistry (DCvC). In this review, we explore innovative realm polymers focusing on recent advances achieved through application DCvC. We start examining history fundamental principles DCvC, detailing its inception core concepts noting key role reversible bond formation. Then reprocessability DCvC is thoroughly discussed, starting from milestones that marked evolution progressing to current trends applications. The influence crystallinity then reviewed, covering diversity, synthesis techniques, functionalities. concluding section, address challenges faced field speculates potential future directions.

Language: Английский

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Introducing Dynamic Bonds in Light‐based 3D Printing

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(20)

Published: April 23, 2023

Abstract Light‐based 3D printing has received significant attention due to several advantages including high speed and resolution. Along with the development of new technologies, material design is key for next generation light‐based printing. Conventional printable polymeric materials, also known as photopolymers or photoresins, often lead thermosets–polymer networks cross‐linked by permanent covalent bonds which bring limited adaptability restricted reprocessability. Dynamic that can reversibly break reform enable network rearrangement, thereby offering unprecedented properties materials such adaptability, self‐healing, recycling capabilities. Hence, introducing dynamic into a promising strategy further expand meet diverse application scenarios printed multi‐functional moreover more demanding sustainable nature‐inspired considerations (e.g., self‐healing). Herein, an overview recent advances in printing, aiming bridge these two research fields presented. Importantly, current challenges are analyzed perspectives developing their potential applications provided.

Language: Английский

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The Key to Solving Plastic Packaging Wastes: Design for Recycling and Recycling Technology

Polymers, Journal Year: 2023, Volume and Issue: 15(6), P. 1485 - 1485

Published: March 16, 2023

Confronted with serious environmental problems caused by the growing mountains of plastic packaging waste, prevention and control waste has become a major concern for most countries. In addition to recycling wastes, design can effectively prevent from turning into solid at source. The reasons are that extend life cycle increase values waste; moreover, technologies helpful improving properties recycled plastics expanding application market materials. This review systematically discussed present theory, practice, strategies, methods extracted valuable advanced ideas successful cases. Furthermore, development status automatic sorting methods, mechanical individual mixed as well chemical thermoplastic thermosetting were comprehensively summarized. combination front-end back-end accelerate transformation industry an unsustainable model economic then achieve unity economic, ecological, social benefits.

Language: Английский

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Circularity in polymers: addressing performance and sustainability challenges using dynamic covalent chemistries

Chemical Science, Journal Year: 2023, Volume and Issue: 14(20), P. 5243 - 5265

Published: Jan. 1, 2023

This review provides a multidisciplinary overview of the challenges and opportunities for dynamic covalent chemistry-based macromolecules towards design new, sustainable, recyclable materials circular economy.

Language: Английский

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High-Strength and Multi-Recyclable Epoxy Vitrimer Containing Dual-Dynamic Covalent Bonds Based on the Disulfide and Imine Bond Metathesis

ACS Sustainable Chemistry & Engineering, Journal Year: 2023, Volume and Issue: 11(39), P. 14591 - 14600

Published: Sept. 12, 2023

Epoxy (EP) vitrimers are currently regarded as ideal substitutes for traditional thermosetting resins, this class of materials combines the advantages thermoplastic and thermoset polymers. However, maintaining high performance EP with excellent healing properties remains a challenge. In work, novel hardener combining disulfide imine bonds through reaction Schiff base (4-AFD-VAN) was designed then used to prepare vitrimer dual-dynamic covalent bonds. Compared single-disulfide-containing (EVP-4-AFD), prepared (EPV-4-AFD-VAN) exhibited lower activation energy faster stress relaxation. Moreover, EPV-4-AFD-VAN showed tensile strength up 71.5 MPa maintained recovery ratio approximately 90.0% during three cycles. Similar EP, retained its good solvent resistance, breakdown strength, dielectric properties, which can be chemically degraded in suitable solvents, demonstrating environmental sustainability.

Language: Английский

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Recyclable fire-retardant bio-based thermosets: From molecular engineering to performances and applications

Progress in Polymer Science, Journal Year: 2025, Volume and Issue: unknown, P. 101935 - 101935

Published: March 1, 2025

Language: Английский

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Debondable adhesives and their use in recycling

Green Chemistry, Journal Year: 2021, Volume and Issue: 24(1), P. 36 - 61

Published: Nov. 22, 2021

Structural adhesives are commonly used to join dissimilar materials and of particular interest in complex technological devices but their use makes recycling difficult.

Language: Английский

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Catalyst-free self-healing fully bio-based vitrimers derived from tung oil: Strong mechanical properties, shape memory, and recyclability

Industrial Crops and Products, Journal Year: 2021, Volume and Issue: 171, P. 113978 - 113978

Published: Aug. 27, 2021

Language: Английский

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High-T_g and Degradable Isosorbide-Based Polybenzoxazine Vitrimer

ACS Sustainable Chemistry & Engineering, Journal Year: 2021, Volume and Issue: 10(1), P. 594 - 602

Published: Dec. 27, 2021

This work describes new fully bio-based vitrimers prepared from isosorbide, a renewable sugar-based chemical. Isosorbide was reacted with 4-hydroxypropionic acid, paraformaldehyde, mono-ethanolamine, and/or furfurylamine via consecutive solvent-free Fischer esterification and Mannich-like ring-closure reactions. The two-step synthesis led to the formation of di-telechelic benzoxazine-terminated isosorbide monomer, containing ester bonds aliphatic hydroxyl furan groups. atom economy factor yields 85%. structural features resulting products were substantiated by spectroscopic techniques. ring-opening polymerization monitored rheological differential scanning calorimetry (DSC) measurements. Very high Tg values afforded substructure measured (from 143 193 °C), which increase ring content. Internally catalyzed transesterification reactions conferred fast dynamic exchanges (τ* = 300 s at 180 °C). Self-healing chemical mechanical recycling also demonstrated. Finally, degradability polybenzoxazine demonstrated as well. materials highly stable in pH-neutral water, even 80 °C for 60 days, but owing structure, pronounced degradation observed under acidic or alkaline conditions. In summary, is suitable building block design degradable 100% recyclable high-Tg vitrimers.

Language: Английский

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The Crucial Role in Controlling the Dynamic Properties of Polyester-Based Epoxy Vitrimers: The Density of Exchangeable Ester Bonds (υ)

Macromolecules, Journal Year: 2021, Volume and Issue: 54(21), P. 10110 - 10117

Published: Oct. 27, 2021

Vitrimer materials that obscure the line between ″thermoset″ and ″thermoplastic″ have already attracted a great deal of interest since they exhibit dynamic properties stress relaxation or reprocessability without losing their permanently cross-linked networks. While much research has been aimed at developing new exchangeable bonds to broaden scope, there is dearth effort in exploring key factors influence vitrimer materials. These explorations are not only useful exact design synthesis but also quite important theory establishment computer simulation. However, few ways including catalyst control confirmed be controlling classical like polyester-based epoxy vitrimer. Here, we proposed density ester (υ) networks crucial role adjusting vitrimers. Four vitrimers were synthesized from tricarboxylic acid curing agent different monomers, resulting various υ's. named ″E202-vitrimer″, ″E380-vitrimer″, ″E500-vitrimer″, ″E640-vitrimer″ according molecular weights monomer. It was revealed these varied with υ value. From E640-vitrimer E202-vitrimer, behavior sped up rise characterized times (τ's) obviously decreased. Meanwhile, activation energy (Ea) Arrhenius prefactor (τ0), which two intrinsic parameters evaluating vitrimers, exhibited heavy dependence on υ, while linear models applied describe relationships. Moreover, τ temperatures could predicted model relied polyester results indicated value calculate τ, Ea, τ0. Besides, resulted might workable other materials, can utilized desired for applications.

Language: Английский

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