High strength, self-healing and hydrophobic fully bio-based polybenzoxazine reinforced pine oleoresin-based vitrimer and its application in carbon fiber reinforced polymers

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 484, P. 149585 - 149585

Published: Feb. 12, 2024

Language: Английский

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Oligosiloxane-Based Epoxy Vitrimers: Adaptable Thermosetting Networks with Dual Dynamic Bonds

ACS Applied Polymer Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 7, 2024

Embedding dynamic covalent bonds into polymer compositions transforms static thermosets active materials with the reprocessability of thermoplastics and bulk properties cross-linked networks. This class next-generation materials, called adaptable networks, shows significant promise in composites, soft optoelectronics, robotics. Herein, we synthesized two oligosiloxane-based epoxy networks that provide fast bond exchange. Oligosiloxane diepoxides were cured stoichiometric amounts 1,2-phenylenediacetic acid to generate bonding mechanisms. The resulting provided access stress-relaxation times (1–10 min) at temperatures only 130 °C excellent reprocessability.

Language: Английский

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Dynamic Covalent Bonds Enabled Carbon Fiber Reinforced Polymers Recyclability and Material Circularity

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: July 20, 2024

Due to their remarkable features of lightweight, high strength, stiffness, high-temperature resistance, and corrosion carbon fiber reinforced polymers (CFRPs) are extensively used in sports equipment, vehicles, aircraft, windmill blades, other sectors. The urging need develop a resource-saving environmentally responsible society requires the recycling CFRPs. Traditional CFRPs, on hand, difficult recycle due permanent covalent crosslinking polymer matrices. combination adaptable networks (CANs) with fibers (CFs) marks new development path for closed-loop recyclable CFRPs resins. In this review, we summarize most recent developments from unique paradigm dynamic polymers, CANs. These sophisticated materials diverse functions, oriented towards CFs resin sustainability, further categorized into several active domains bonds, including ester imine disulfide boronic acetal linkages, etc. Finally, possible strategies future design CFPRs by combining chemistry innovation interface science proposed.

Language: Английский

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Towards sustainable reprocessable structural composites: Benzoxazines as biobased matrices for natural fibers

Composites Part B Engineering, Journal Year: 2024, Volume and Issue: 272, P. 111201 - 111201

Published: Jan. 21, 2024

Language: Английский

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Epoxy vitrimers: from essence to utility

International Polymer Processing, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 20, 2025

Abstract Concerns about the effect on environment and non-renewable nature of plastics have sparked a substantial field study towards creation recyclable polymers. Vitrimers are potential class reusable polymers that recently attracted lot interest. Like conventional thermosets in strength, durability, chemical resistance, these materials offer added benefit being at end their useful life. Their structure, which includes dynamic covalent crosslinks to provide stability while enabling reprocessing, is credited with this special characteristic. We lay out an overview recent developments applications epoxy based vitrimeric by using different types adaptable networks (CANs) – single, dual triple paper attention design tactics make it easier create circular future. Covalent Adaptable Networks (CAN), novel polymer family can bridge gap between thermoplastics, emerged years uses chemistry crosslinked networks. The was enhanced 2011 Leibler colleagues when they introduced notion vitrimers, retain integrity network even after heating allow connections be reallocated within them associative exchange reactions. This review also demonstrates how vitrimer community paying need for sustainable material development demonstrating use biobased building blocks synthesis high-performing vitrimers. Having outlined primary characteristics commercialization vitrimers emphasized portray benefits self-healing, malleability, orthogonal processability, various shape memories along solutions synthetic materials.

Language: Английский

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Flexible and Stretchable Vitrimers for Sustainable Electronics

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: 17(6), P. 9736 - 9747

Published: Jan. 31, 2025

The rapid increase in electronic waste (e-waste) necessitates sustainable materials that combine functionality with recyclability. Here, we introduce a novel approach for creating flexible vitrimers─reprocessable polymers dynamic covalent bonds─for use applications, such as wiring and connectors. By extending polymer chains employing transesterification reaction, develop vitrimers exhibit tunable viscoelastic properties, high stretchability (over 250% tensile strain), enhanced toughness (up to 466 J/m3). Our demonstrate topological freezing temperature (Tv) of 185-248 °C, adjustable through catalyst concentration chain length. are synthesized by using two-step process involving widely available industrial chemicals. Molecular dynamics simulations provide insight into how extension network topology affect viscoelasticity, supporting the experimental findings. Using transesterification, bonding between rigid can be achieved. We prototype functional USB cable successfully transfers power data, showcases repairability, is recyclable solvent-based process. These results highlight potential reducing e-waste advancing manufacturing.

Language: Английский

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Polypropylene Covalent Adaptable Networks with Full Cross-Link Density Recovery after Reprocessing: Development by Free-Radical Reactive Processing with Resonance-Stabilized, Aromatic Disulfide Cross-Linkers

ACS Macro Letters, Journal Year: 2025, Volume and Issue: unknown, P. 341 - 348

Published: March 5, 2025

A single-step method that produces percolated, dynamic covalent cross-links integrated into the PP homopolymer has not been previously demonstrated. Here, we synthesized adaptable networks (CANs) from polypropylene (PP) homopolymers using 180 °C, radical-based, reactive processing with a free-radical initiator, dicumyl peroxide (DCP), and resonance-stabilized, aromatic disulfide cross-linkers, one methacrylate-based another phenyl acrylate-based. Both cross-linkers yielded when reactively processed at 4 wt % relatively high molecular weight (MW) (melt flow index (MFI) = 12) DCP. The acrylate-based cross-linker also other studied DCP/cross-linker concentrations low MW (MFI 35). Notably, our highest cross-link density CAN exhibited full recovery of after three reprocessing steps by compression molding; within experimental uncertainty melt extrusion.

Language: Английский

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Nanocomposites from Au‐Doped Vinylogous Urethane Vitrimers Based on Different Block Copolymers and Their Recyclability in Combination with Plasmonic Heating

Macromolecular Rapid Communications, Journal Year: 2025, Volume and Issue: unknown

Published: March 6, 2025

The combination of gold nanoparticles (Au-NPs) and block copolymer (BCP)-based vinylogous urethane vitrimers leads to advanced nanocomposites where the thermal, mechanical, thermo-mechanical properties are enhanced without interfering with formation groups transamination in dynamic polymer network. Photoiniferter reversible addition-fragmentation chain transfer polymerization (photoRAFT) inverse Turkevich synthesis used this work fabricate desired BCPs spherical Au-NPs. key feature is integration Au-NPs into matrix as fixed parts hybrid network, ensuring full recyclability. A wide range can be tuned by variations content, monomers, BCP architecture. After ligand exchange, network formation, reprocessing through heat compression, unique optical retained, allowing plasmonic heating trigger exchange reaction within materials. As a result, Au-doped self-heal exhibit shape-memory shortly after exposure not only but also light. This incorporation could provide versatile platform for development materials offering potential applications coatings, sensors, electronic devices, etc.

Language: Английский

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Covalent Adaptable Networks through Dynamic N,S-Acetal Chemistry: Toward Recyclable CO₂-Based Thermosets

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(46), P. 25450 - 25462

Published: Nov. 9, 2023

Finding new chemistry platforms for easily recyclable polymers has become a key challenge to face environmental concerns and the growing plastics demand. Here, we report dynamic between CO2-sourced alkylidene oxazolidones thiols, delivering circular non-isocyanate polyurethane networks embedding N,S-acetal bonds. The production of oxazolidone monomers from CO2 is facile scalable starting cheap reagents. Their copolymerization with polythiol occurs under mild conditions in presence catalytic amount acid furnish polymer networks. structure tuned by virtue monomer design, translating into wide panel mechanical properties similar commodity plastics, ranging PDMS-like elastomers [with Young's modulus (E) 2.9 MPa elongation at break (εbreak) 159%] polystyrene-like rigid (with E = 2400 MPa, εbreak 3%). highly dissociative nature bonds demonstrated exploited offer three different recycling scenarios thermosets: (1) compression molding, extrusion, or injection molding─with multiple (at least 10 times) without any material property deterioration, (2) chemical through depolymerization, followed repolymerization, also applicable composites, (3) upcycling two oxazolidone-based thermosets single one distinct properties. This work highlights platform designing containing elusive motifs. versatility this shows great potential preparation materials (including composites) tuneable structures properties, end-of-life scenarios.

Language: Английский

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From biomass to vitrimers: Latest developments in the research of lignocellulose, vegetable oil, and naturally-occurring carboxylic acids

Industrial Crops and Products, Journal Year: 2023, Volume and Issue: 206, P. 117690 - 117690

Published: Oct. 28, 2023

Language: Английский

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