Taking dynamic covalent chemistry out of the lab and into reprocessable industrial thermosets

Nature Reviews Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 31, 2025

Language: Английский

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Structure–Property Relationships of Elastomeric Vinylogous Urethane Thermosets and Their Application as Closed-Loop Recyclable Strain Sensors

Macromolecules, Journal Year: 2025, Volume and Issue: 58(4), P. 1923 - 1934

Published: Feb. 5, 2025

Developing closed-loop recyclable thermosets and understanding their structure–property relationships are essential steps in advancing a circular materials economy. Here, we present vinylogous urethane (VU) thermoset with recyclability, synthesized through the reaction of polytetrahydrofuran bisacetoacetate (aPTHF) tris(2-aminoethyl)amine (TREN). These VU polymers exhibit high elasticity, only 3–9% residual strain observed after cyclic tensile testing at maximum 100%, depending on molecular weight aPTHF network cross-link density. The two structural parameters also allow modulation mechanical stress-relaxation properties elastomers. To investigate hydrolysis linkages within hydrophobic matrix, employed heterogeneous system using biphasic mixture HCl CDCl3. Our findings show that VUs remain stable pure water but can be dissociated under acidic conditions, dissociation rate accelerated higher temperatures and/or presence concentrations. detailed investigations indicate potential elastomers as sustainable substrates for wearable sensors. We therefore conduct case study synthesizing sensor incorporation multiwalled carbon nanotubes (MCNs) into elastomer matrix. robustly detect various movements. Moreover, treatment both neat polymer composite diethyl ether solvent allows excellent recovery (>90%) TREN (86%), without discernible damage to MCNs reclaimed from latter.

Language: Английский

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Controlling the Relaxation Dynamics of Polymer Networks by Combining Associative and Dissociative Dynamic Covalent Bonds

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 27, 2024

Abstract Dynamic polymer networks offer a promising solution to key challenges in polymers such as recyclability, processability, and damage repair. However, the trade‐off between combining facile fast self‐healing, high creep resistance remains major obstacle implementation. To overcome this, two very distinct dynamic covalent chemistries, Diels–Alder transesterification, is combined single network. The resulting dual an unprecedented set of properties control over relaxation times. system decouples dynamics network from spatial motifs, tuning ratio chemistries enables six orders magnitude. Taking advantage this control, composition rheological behavior optimized drastically improve resolution for extrusion‐based additive manufacturing networks. Additionally, well‐defined separated stress peaks are observed at compositions close 50% each chemistry, accentuating double character system's dynamics. This atypical situation, preparation self‐healing materials with negligible creep, shape‐memory solely leveraging dynamics, instead glass transition temperature or melting point.

Language: Английский

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Vitrimers for 3D Printing Technology: Current Status and Future Perspectives

Industrial & Engineering Chemistry Research, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 27, 2025

Vitrimers are a class of advanced polymeric materials characterized by their dynamic covalent networks, which offer unique properties such as self-healing, reprocessability, and shape memory. The integration vitrimers into 3D printing technologies presents significant advancement in the field additive manufacturing, offering numerous benefits over traditional thermoplastics thermosets. use printing, leverages ability to be cured reformed under specific conditions, exposure light or heat. enable production high-resolution parts that can easily repaired recycled, addressing key environmental concerns associated with polymers. Their nature not only extends life printed components but also reduces waste promotes sustainability enabling recycling materials. Recent developments for have focused on optimizing performance, including enhancing mechanical strength, expanding range printable materials, improving efficiency process. Studies demonstrated achieve impressive high tensile elasticity, thermal stability, making them suitable various applications. continued research development hold promise advancing capabilities providing pathway more sustainable versatile By harnessing vitrimers, industry push boundaries what is possible material design functionality, leading innovative solutions complex engineering challenges. This article provides comprehensive review reported literature explores potential techniques. It offers detailed insight present trends field.

Language: Английский

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Sustainable closed-loop recycling of vinylogous urethan-based covalent adaptable networks: Impact of branching nodes on mechanical strength and recyclability

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 162306 - 162306

Published: April 1, 2025

Language: Английский

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Mechanically robust, creep resistant and photo-stimuli-responsive elastomer vitrimer enabled by integrating boronic ester bond and carboxyl-Fe3+ complex

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 693, P. 137568 - 137568

Published: April 16, 2025

Language: Английский

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How to Characterize Covalent Adaptable Networks: A User Guide

ACS Polymers Au, Journal Year: 2025, Volume and Issue: unknown

Published: April 17, 2025

Language: Английский

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Recyclable Flame-Retardant Thermosets and Their Fiber-Reinforced Composites

Macromolecules, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 1, 2024

Language: Английский

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Enabling the Reprocessability and Debonding of Epoxy Thermosets Using Dynamic Poly(β‐Amino Amide) Curing Agents

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 30, 2024

Abstract Epoxy resins, by showing outstanding performances, stand out as the most applied materials in thermoset products. However, their excellent properties, associated with covalently cross‐linked structures, come at expense of recyclability, thus posing environmental and regulatory challenges. Herein, starting from recently explored reversibility robust poly(β‐amino amide)s, dynamic curing agents are synthesized a one‐pot procedure for use preparation epoxy‐derived networks. The obtained retain desirable properties while being fully (re)processable, high temperature‐dependent viscoelasticity (activation energy (E ) ≈230 to 270 kJ mol −1 ). Moreover, this new generation epoxy shows resistance hydrolysis creep elevated temperatures (up 120 °C). As an entry point further applications, reversible implemented adhesive formulations, showcasing lap shear strengths that comparable commercial hardeners 9 MPa). β‐amino amide groups provide adhesives additional functionality heat‐triggered deconstruction (130 150 °C), re‐bonding capacity up 80% recovery lap‐shear strength. To encourage industrial adoption, cost‐effective, drop‐in synthesis protocol is developed using only bulk chemicals, hence facilitating practical implementation.

Language: Английский

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Repairable 3D printable photopolymer resins based on low-activation-energy adaptable covalent bonding

Polymer, Journal Year: 2024, Volume and Issue: unknown, P. 127997 - 127997

Published: Dec. 1, 2024

Language: Английский

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