Reaction of β‐Ketoester and 1,3‐Diol to Access Chemically Recyclable and Mechanically Robust Poly(vinyl alcohol) Thermosets through Incorporation of β‐(1,3‐dioxane)ester DOI Creative Commons
Youwei Ma, Chihui Zheng, Gadi Slor

et al.

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 136(44)

Published: Aug. 6, 2024

Abstract The development of mechanically robust, chemically stable, and yet recyclable polymers represents an essential undertaking in the context advancing a circular economy for plastics. Here, we introduce novel cleavable β‐(1,3‐dioxane)ester ( DXE ) linkage, synthesized through catalyst‐free reaction β‐ketoester 1,3‐diol, to cross‐link poly(vinyl alcohol) PVA formation high‐performance thermosets with inherent chemical recyclability. , modified groups transesterification excess tert ‐butyl acetoacetate, undergoes cross‐linking reactions unmodified 1,3‐diols within itself upon thermal treatment. architecture improves ’s mechanical properties, Young's modulus toughness that can reach up 656 MPa 84 MJ cm −3 i.e. approximately 3‐ 12‐fold those linear respectively. Thermal treatment cross‐linked under acid conditions leads deconstruction networks, enabling excellent recovery (>90 %) . In absence either or acidic treatment, maintains its dimensional stability. We show is also possible when performed presence other plastics commonly found recycling mixtures. Furthermore, ‐based composites comprising carbon fibers activated charcoal by linkages are shown be fillers.

Language: Английский

Structure–Property Relationships of Elastomeric Vinylogous Urethane Thermosets and Their Application as Closed-Loop Recyclable Strain Sensors DOI Creative Commons
Youwei Ma, Francesco Stellacci

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

Citations

2
Biobased, degradable and directional porous carboxymethyl chitosan/lignosulfonate sodium aerogel-based piezoresistive pressure sensor with dual-conductive network for human motion detection DOI
Lu Han, Hongtao Zhu, Junhuang Xu

et al.

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 497, P. 154868 - 154868

Published: Aug. 15, 2024

Language: Английский

Citations

4
Castor Oil-Based Epoxy Vitrimer Based on Dual Dynamic Network with Intrinsic Photothermal Self-Healing Capability DOI Open Access

Yingqing Shao,

Haoxin Zhu,

Kang Chen

et al.

Polymers, Journal Year: 2025, Volume and Issue: 17(7), P. 897 - 897

Published: March 27, 2025

The development of sustainable epoxy vitrimers with outstanding mechanical strength and facile self-healing capabilities are great significance for prolonging the lifespan enhancing reliability electronic devices. In this study, we present a castor oil-derived vitrimer (ASB-ECO) featuring dual dynamic networks enabled by rationally designed ester-imine bonds an aromatic Schiff base-conjugated crosslinker architecture. This molecular design strategy effectively enhances properties vegetable oil-based endows them controllable under photothermal conversion. 1.0-ASB-ECO system demonstrates characteristics activation energy (Ea) 37.25 kJ/mol topological freezing transition temperature (Tv) 123.13 °C. material exhibits conversion efficiency (ηPT = 61.42%) can achieve rate 100% visible-light radiation. addition, displays dielectric constant (Dk) 5.54 loss tangent (Df) 0.025 at 106 Hz. study on biomass-based presents novel approach to developing materials, achieving combination high performance, sustainability, properties.

Language: Английский

Citations

0
Biomass-Based Functional Composite Resins with Recyclable and Shape Memory Properties DOI
Shenglong Liao, Shuying Zhong,

Can Sun

et al.

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

Published: April 21, 2025

A key challenge in developing advanced functional thermosets lies designing molecular architectures capable of integrating different specific performances into one material to meet diverse application demands. Here, a chitosan-derived trifunctional compound containing maleimide groups was used directly cross-link tung oil-based polymer for fabricating multifunctional composite bioresins with reversible Diels-Alder bonds. The cross-linking networks within resins were featured stress relaxation, thermal reprocessability, and recyclability. retro D-A reaction at relatively high temperatures provided the dynamic characteristics while ensuring their dimensional stability. Moreover, chitosan enhanced mechanical properties forming supramolecular hydrogen bonds via its abundant amino/hydroxyl groups, realizing shape memory resins. Furthermore, synergistic interaction between bonding also imparted proton conductivity This work design paradigm that harmonizes integration fully biomass resins, aiming high-value applications.

Language: Английский

Citations

0
Chemical Recycling of Step-Growth Polymers Guided by Le Chatelier’s Principle DOI Creative Commons
Zhiyong Liu, Youwei Ma

ACS Engineering Au, Journal Year: 2024, Volume and Issue: 4(5), P. 432 - 449

Published: July 15, 2024

Although step-growth polymers (SGPs) play a fundamental role in the plastics economy, contributing significantly to various facets of our daily life, their end-of-life management remains inadequately addressed. Chemical recycling SGP wastes, involving depolymerization followed by repolymerization, emerges as promising solution toward achieving circular economy. The SGPs is usually dynamic equilibrium with polymerization reactions, thus falling under system amenable Le Chatelier's principle. This perspective endeavors elucidate interplay between principle and chemical particular emphasis on guidance provided latter process. To this end, we have selected five conventional SGPs, namely, poly(ethylene terephthalate), polyamides, polycarbonates, polyurethanes, polyureas, representatives how alterations temperature, pressure, concentrations products or reactants, catalysts influence process SGPs. Additionally, proposes several potential strategies for applying

Language: Английский

Citations

3
Reaction of β‐Ketoester and 1,3‐Diol to Access Chemically Recyclable and Mechanically Robust Poly(vinyl alcohol) Thermosets through Incorporation of β‐(1,3‐dioxane)ester DOI Creative Commons
Youwei Ma, Chihui Zheng, Gadi Slor

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(44)

Published: Aug. 6, 2024

Abstract The development of mechanically robust, chemically stable, and yet recyclable polymers represents an essential undertaking in the context advancing a circular economy for plastics. Here, we introduce novel cleavable β‐(1,3‐dioxane)ester ( DXE ) linkage, synthesized through catalyst‐free reaction β‐ketoester 1,3‐diol, to cross‐link poly(vinyl alcohol) PVA formation high‐performance thermosets with inherent chemical recyclability. , modified groups transesterification excess tert ‐butyl acetoacetate, undergoes cross‐linking reactions unmodified 1,3‐diols within itself upon thermal treatment. architecture improves ’s mechanical properties, Young's modulus toughness that can reach up 656 MPa 84 MJ cm −3 i.e. approximately 3‐ 12‐fold those linear respectively. Thermal treatment cross‐linked under acid conditions leads deconstruction networks, enabling excellent recovery (>90 %) . In absence either or acidic treatment, maintains its dimensional stability. We show is also possible when performed presence other plastics commonly found recycling mixtures. Furthermore, ‐based composites comprising carbon fibers activated charcoal by linkages are shown be fillers.

Language: Английский

Citations

3
Direct Monomer Recovery from Ring-Closing Depolymerization of Thermosets DOI Creative Commons
Chihui Zheng, Gadi Slor, Youwei Ma

et al.

ACS Macro Letters, Journal Year: 2024, Volume and Issue: unknown, P. 1704 - 1710

Published: Dec. 7, 2024

Recovering monomers from the depolymerization of thermosets presents a significant challenge, which becomes even more daunting if one sets goal doing it directly, i.e., without complex chemical separation steps. To this end, we have synthesized new type polycarbonate thermoset by first copolymerizing alkyl cyclic carbonates (ACCs) with small amounts allyloxy (AoCCs), followed cross-linking resulting excess tetrathiol compounds under UV irradiation. These cross-linked polycarbonates demonstrate enhanced thermal and mechanical properties compared to their linear analogues, while maintaining polymers' capacity for ring-closing depolymerization. The process enables direct recovery ACC its dimer, bypassing steps that are commonly employed in recycling conventional chemically recyclable thermosets. yields range 74.7% 91.7% depending on ratios AoCC Furthermore, recovered can be repolymerized AoCCs leading same quality initially one.

Language: Английский

Citations

1
Reaction of β‐Ketoester and 1,3‐Diol to Access Chemically Recyclable and Mechanically Robust Poly(vinyl alcohol) Thermosets through Incorporation of β‐(1,3‐dioxane)ester DOI Creative Commons
Youwei Ma, Chihui Zheng, Gadi Slor

et al.

Angewandte Chemie, Journal Year: 2024, Volume and Issue: 136(44)

Published: Aug. 6, 2024

Abstract The development of mechanically robust, chemically stable, and yet recyclable polymers represents an essential undertaking in the context advancing a circular economy for plastics. Here, we introduce novel cleavable β‐(1,3‐dioxane)ester ( DXE ) linkage, synthesized through catalyst‐free reaction β‐ketoester 1,3‐diol, to cross‐link poly(vinyl alcohol) PVA formation high‐performance thermosets with inherent chemical recyclability. , modified groups transesterification excess tert ‐butyl acetoacetate, undergoes cross‐linking reactions unmodified 1,3‐diols within itself upon thermal treatment. architecture improves ’s mechanical properties, Young's modulus toughness that can reach up 656 MPa 84 MJ cm −3 i.e. approximately 3‐ 12‐fold those linear respectively. Thermal treatment cross‐linked under acid conditions leads deconstruction networks, enabling excellent recovery (>90 %) . In absence either or acidic treatment, maintains its dimensional stability. We show is also possible when performed presence other plastics commonly found recycling mixtures. Furthermore, ‐based composites comprising carbon fibers activated charcoal by linkages are shown be fillers.

Language: Английский

Citations

0