Dual‐Factor‐Controlled Dynamic Precursors Enable On‐Demand Thermoset Degradation and Recycling

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

Published: Sept. 3, 2024

Abstract Thermosets are well known for their advantages such as high stability and chemical resistance. However, developing sustainable thermosets with degradability recyclability faces several principal challenges, including reconciling the desired characteristics during service recycling reprocessing properties required at end of life, establishing efficient methods large‐scale synthesis, aligning current manufacturing process. Here a general strategy is presented on‐demand degradation under mild conditions utilizing dynamic precursors dual‐factor‐controlled reversibility. Specifically, triazine crosslinkers introduced through nucleophilic aromatic substitution (S N Ar) into precursor polyols used in polyurethane (PU) synthesis. Upon removal catalyst alcohol, reversibility S Ar deactivated, allowing use standard PU polymerization techniques injection molding, casting, foaming. The resulting cyanurate‐crosslinked PUs maintain diverse mechanical traditional crosslinked PUs, yet offer advantage easy depolymerization by activating specific but conditions—a combination base, heat. It envisioned that this approach, involving pre‐installation crosslinkers, can be broadly applied to thermosetting plastic processes, introducing enhanced sustainability.

Language: Английский

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Biobased and aromatic Covalent Adaptable Networks: When architectures meet properties, within the framework of a circular bioeconomy

Materials Science and Engineering R Reports, Journal Year: 2024, Volume and Issue: 161, P. 100882 - 100882

Published: Nov. 9, 2024

Language: Английский

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A Perspective on Carbon–Carbon Diradical-Mediated Dynamic Covalent Synthesis of Organic Macrocycles and Their Emerging Functions

Crystal Growth & Design, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 15, 2025

A biological self-assembly of organized supramolecular structures and functional materials has emerged as a significant research focus in recent decades. Different strategies have been proposed successfully adopted for engineering complex structures. Among others, substantial progress made using dynamic covalent chemistry (DCC) to generate with sophisticated properties. This Perspective elaborates on the role carbon–carbon (C–C)-based diradical-based DCC self-assembly. It provides an in-depth discussion structural aspects C–C bonds discrete oligomer formation including dimers, trimers, tetramers, hexameric Early sections survey critical factors contributing longevity stability radical systems influences substitution diradicals into dimers or macrocycles. Significant attention given characteristics diradical impact hydrogen π–π interactions configurations self-assembled The latter part this article properties applications DCC-mediated primary objectives review are (i) present detailed analysis benefits associated diradical-mediated (ii) investigate their

Language: Английский

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Ultra-Strong, Humidity-Tolerant Thermoset Based on Dynamic Covalent Bond Integration Strategy via Boron−Nitrogen Bidentate Coordination

Macromolecules, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 27, 2025

Language: Английский

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Epoxy-Based Vitrimers for Sustainable Infrastructure: Emphasizing Recycling and Self-Healing Properties

Polymers, Journal Year: 2025, Volume and Issue: 17(3), P. 373 - 373

Published: Jan. 30, 2025

Epoxy-based vitrimers represent a paradigm shift in material science, offering an unprecedented combination of mechanical robustness, environmental sustainability, and reconfigurability. These dynamic polymer systems utilize associative covalent bonds (DCBs) such as transesterification to blend the structural integrity thermosets with recyclability self-healing properties thermoplastics. This unique makes ideal candidates for high-performance applications industries civil engineering, where durability, repairability, compatibility are critical. vitrimers, particular, exhibit exceptional capabilities, allowing them autonomously repair microcracks damage, restoring under appropriate stimuli heat or light. Their further aligns global sustainability goals by reducing waste lifecycle costs. Recent advancements have also integrated bio-based feedstocks scalable manufacturing methods, enhancing feasibility these materials industrial applications. review explores underlying mechanisms, recycling processes, emerging role epoxy-based engineering. Challenges related scalability, optimization, regulatory acceptance discussed, focus on their potential drive sustainable innovation infrastructure materials.

Language: Английский

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Monitoring the On-Surface Boronic Acid Condensation Process at the Nanoscale Using Tip-Enhanced Raman Spectroscopy

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 6, 2025

The on-surface condensation of boronic acids is a key step in fabricating functional interfaces with tailored properties; yet, clear understanding the molecular structural transformations involved remains significant challenge. Here, we directly monitor reaction self-assembled monolayer 4-mercaptophenylboronic acid (MPBA) on Au(111) using tip-enhanced Raman spectroscopy (TERS). evolution MPBA adlayer tracked via emergence new peaks, blue shifts, and intensity changes characteristic bands. Hyperspectral TERS imaging provides comprehensive insight into transformations, including B-O-B bond formation, increased constraints, an orientation. Furthermore, density theory simulations confirm that boroxine trimer primary product reaction. This study insights chemistry for rational design functionalized surfaces targeted chemical properties.

Language: Английский

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Benign separated cellulose adhesive hydrogel via constructing double dynamic covalent bonds for ultra-fast hemostasis and antibacterial

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160665 - 160665

Published: Feb. 1, 2025

Language: Английский

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Cuprous-Sulfide-Nanoplate-Catalyzed Click Chemistry for In Situ Construction of Covalent Organic Polymer Heterostructures for Efficient Photocatalytic Reduction and Removal of U(VI)

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: 17(9), P. 14527 - 14536

Published: Feb. 18, 2025

In this study, a core–shell heterostructure of cuprous sulfide (Cu2S) nanoplates and covalent organic polymers (COPs) (Cu2S@COP) was constructed in situ by Cu2S-catalyzed azide–alkyne reaction for efficient reduction rapid removal U(VI) from uranium mine wastewater. The simple synthesis heterojunctions through click chemistry reactions can create tight bond at the interface evade laborious process conventional composites. different Fermi energy levels Cu2S COP induce formation built-in electric field within heterojunction, photogenerated charge transfer to nanoplate results substantial boost efficiency photocatalytic U(VI). Cu2S@COP heterojunction demonstrates high capacity 1164.6 mg g–1 without need sacrificial agent, which is 2.08 times higher than nanoplates, 3.02 COP, better most other previous heterostructures. present method involves good specificity achieves 85.9% preparation via provides new design concept composite construction presents novel strategy modulate activity contaminant management.

Language: Английский

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Development of Mechanically Tunable Polythiourethane Elastomers for Recyclable Energetic Material

ACS Applied Polymer Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 20, 2025

Language: Английский

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Tung oil-derived polyurethane composite foams based on dual dynamic phenol-carbamate exchange with desirable mechanical properties, flame retardancy and recyclability

Composites Part B Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 112306 - 112306

Published: Feb. 1, 2025

Language: Английский

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