Carbon Fiber-Reinforced Dynamically Cross-linked Epoxy Resin Composites with Excellent Self-healing and Recycling Performance via Autocatalyzed β-Hydroxyl Ester Bonds DOI

Shunbing Cai,

Xiaokang Zhang, Zhanhua Wang

и другие.

Industrial & Engineering Chemistry Research, Год журнала: 2024, Номер unknown

Опубликована: Дек. 16, 2024

Employing epoxy resins containing dynamic covalent bonds to fabricate carbon fiber-reinforced polymer (CFRP) composite materials provides a solution solve the challenge that traditional resin composites are difficult degrade and recycle. The curing reaction between anhydride monomer will generate hydroxyl ester groups, which can undergo transesterification, endowing with degradation performance. Large amounts of catalysts an extra alcoholic compound often required break down cross-linked networks for complete degradation, results in separation degraded product. To this dilemma, we synthesized autocatalytic high-performance recyclable tensile strength 91.9 MPa, Young's modulus 2.85 GPa, Tg 91.3 °C. fully cured be completely hot N,N-dimethylformamide due fast exchange β-hydroxyl autocatalyzed by formed ternary amine network, may induce loop formation result degradation. This also endows fabricated CFRP strong interlaminar shear 58.65 MPa excellent self-healing capacity healing efficiency 99.5%. Moreover, after being heated at 140 °C 20 min. recycled fibers reused new properties comparable those original ones. product into polyurethane mechanical performance, realizing full recycling materials.

Язык: Английский

Chemically Recyclable Supramolecular Thermosets toward Strong and Reusable Hot-Melt Adhesives DOI
Chunyang Bao, Yanlong Yin, Yuhan Ding

и другие.

Macromolecules, Год журнала: 2023, Номер 56(17), С. 6633 - 6643

Опубликована: Авг. 25, 2023

Chemically recyclable thermosets are an ideal substitute for traditional in the development of a circular economy and sustainable environment. However, efficient easy-to-achieve chemical recycling strategies remains challenging. Herein, series supramolecular that can be chemically recycled under mild acid conditions at room temperature fabricated by cross-linking polyimine polymers with dynamic boroxines (PIx-Boroxine). By tailoring molar content boroxines, PI1.2-boroxine exhibit tensile strength ∼30.6 MPa, yield 33.0 elongation break ∼111.6%, Young's modulus ∼679.6 MPa. Because nature imine bonds, PIx-boroxine thermoset exhibits fast stress relaxation behavior, which enables them to have good reprocessing ability. These unique features also guarantee high-performance reusable hot-melt adhesive. The maximum lap shear PIx-Boroxine-based adhesives stainless steel bonding adhesive reach ∼18.6 is comparable commercial adhesives. Meanwhile, reused least 10 times only small amount reduction strength. More importantly, easily depolymerized 0.1 M HCl/H2O solution temperature. Further, monomers efficiently separated simple separation procedure. recovered fabricate new without losing their mechanical properties. This work provides design strategy develop recyclability, will contribute modern society.

Язык: Английский

Процитировано

23
Eugenol-based dual-cured materials with multiple dynamic exchangeable bonds DOI Creative Commons
Adrià Roig, Xavier Ramis, Silvia De la Flor

и другие.

European Polymer Journal, Год журнала: 2024, Номер 206, С. 112782 - 112782

Опубликована: Янв. 19, 2024

In the present work, preparation of sustainable thermosets has been approached simultaneously from three different points view: a) use bio-based monomers chemically modified through green methodologies, b) adoption dual curing click-type reactions to implement more efficient manufacturing processes, and c) inclusion interchangeable groups in network, enable reuse recycling material at end its useful life avoid waste generation. The first goal by synthesizing a greener way an acrylate-epoxy derivative eugenol (AEEU) glycerol triacrylate (GTA), both biobased resources. Then, second approach was addressed using cystamine as crosslinker obtain materials dual-curing procedure based on "click" aza-Michael reaction epoxy-amine reaction. Intermediate final could be prepared with tailorable properties controlling molar ratio AEEU GTA. By DSC rheology, we evaluate sequentiality gelation process. Finally, covalent adaptable networks (CANs) contained types dynamic bonds (disulfide, esters, β-aminoesters) their thermomechanical were tested DMA revealing Tgs above room temperature 47 70 °C. Bending tests break performed mechanical reaching values up 90 MPa stress 7 % deformation. Stress relaxation showed that all relax relatively low temperatures (120 °C) less than 21 min. associative dissociative behavior these investigated rheology clear drop modulus high frequencies when used crosslinker. Moreover, reprocessability obtaining homogeneous samples no significant changes chemical thermal highlighting great potential wide range possibilities many fields CANs.

Язык: Английский

Процитировано

8
Aza-Michael Chemistry for PDMS-Based Covalent Adaptable Elastomers: Design and Dual Role of the Silica Filler DOI
Loc Tan Nguyen, Chiel Mertens, Filip Du Prez

и другие.

Macromolecules, Год журнала: 2024, Номер 57(10), С. 4817 - 4825

Опубликована: Май 7, 2024

In this study, polydimethylsiloxane (PDMS)-based covalent adaptable networks have been prepared in a one-pot, catalyst-free way which dynamic β-amino esters (BAEs) are introduced via aza-Michael addition between available acrylate/amine-terminated PDMS-compounds. The straightforward introduction of those BAE-groups such high-value elastomers provides the ability to relax applied stress at elevated temperatures and hence capability reshaping by compression molding least 5 times without significant changes properties. Moreover, mechanical properties tunable varying cross-linker and/or filler content. Interestingly, utilization silica fillers not only enhances network formation but also accelerates exchange reactions, resulting twice faster relaxation while maintaining creep resistance service temperatures.

Язык: Английский

Процитировано

7
Fully Recyclable Covalent Adaptable Network Composite with Segregated Hexagonal Boron Nitride Structure for Efficient Heat Dissipation DOI
Dupyo Jeon,

Yeomyung Yoon,

Doyeon Kim

и другие.

Macromolecules, Год журнала: 2023, Номер 56(2), С. 697 - 706

Опубликована: Янв. 5, 2023

As electronics become smaller and denser in function, lighter polymer composites with high thermal conductivity (TC) have been increasingly developed as heat-dissipating materials. Since the matrix exhibits a vanishingly low TC compared that of filler, composite is determined by heat conduction pathway formed along interconnected filler networks. In this context, can be obtained increasing loading up to maximum packing limit. However, tradeoff between weight prohibits constant increase loading. To end, highly networked but heat-processable poly(β-amino ester) covalent adaptable network (CAN) based on catalyst-free transesterification dynamic aza-Michael reaction synthesized realize both density. Owing unique malleable characteristic CAN, conductive networks (or segregated structure) are CAN domain interfaces upon simple heat-pressing powder mixture hexagonal boron nitride (hBN). The resulting an exceptionally 13.5 W/mK at density 1.75 g/cm3. value corresponds 197% identical randomly dispersed hBN. further highlight versatility matrix, ecofriendly recycling through reprocessing recovery depolymerizing heated water without using any external catalysts also demonstrated.

Язык: Английский

Процитировано

15
BiTEMPS methacrylate dynamic covalent cross-linker providing rapid reprocessability and extrudability of covalent adaptable networks: high-yield synthesis with strong selectivity for disulfide linkages DOI Creative Commons
Tapas Debsharma, Nathan S. Purwanto, Logan M. Fenimore

и другие.

Polymer Chemistry, Год журнала: 2024, Номер 15(21), С. 2167 - 2176

Опубликована: Янв. 1, 2024

A dialkylamino disulfide-based dynamic covalent cross-linker (BTMA) was synthesized with high purity and selectivity for disulfides used to produce rapidly reprocessable extrudable adaptable networks n -hexyl methacrylate.

Язык: Английский

Процитировано

6
Exploring the dual dynamic synergy of transesterification and siloxane exchange in vitrimers DOI
Sami Fadlallah, Filip Van Lijsebetten, Tapas Debsharma

и другие.

European Polymer Journal, Год журнала: 2024, Номер 213, С. 113117 - 113117

Опубликована: Май 11, 2024

Язык: Английский

Процитировано

5
Tailoring dynamic mechanism of covalent adaptable polyurea networks by varying the category of isocyanates DOI

Fengbiao Chen,

Fei Gao,

Yifan Ge

и другие.

European Polymer Journal, Год журнала: 2024, Номер 207, С. 112826 - 112826

Опубликована: Фев. 6, 2024

Язык: Английский

Процитировано

4
Ultra‐Fast Selenol‐Yne Click (SYC) Reaction Enables Poly(selenoacetal) Covalent Adaptable Network Formation DOI
Mengyao Zhang, Sisi Chen,

Guichuan Xu

и другие.

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Авг. 14, 2024

The emergence of covalent adaptable networks (CANs) based on dynamic bonds (DCBs) presents a promising avenue for achieving resource recovery and utilization. In this study, we discovered bond called selenacetal, which is obtained through double click reaction between selenol activated alkynes. Density functional theory (DFT) calculations demonstrated that the ΔG formation selenoacetals ranges from 12 to 18 kJ mol

Язык: Английский

Процитировано

4
β-Amino amide based covalent adaptable networks with high dimensional stability DOI
Loc Tan Nguyen, Francesca Portone, Filip Du Prez

и другие.

Polymer Chemistry, Год журнала: 2023, Номер 15(1), С. 11 - 16

Опубликована: Дек. 6, 2023

Catalyst-free reversible β-amino amides in covalent adaptable networks with reprocessability and high dimensional stability.

Язык: Английский

Процитировано

10
Heterocycle-based dynamic covalent chemistry for dynamic functional materials DOI Creative Commons
Zeyu Ma,

Siyu Pan,

Yang Yang

и другие.

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Апрель 17, 2025

Dynamic covalent chemistry, which renders reusable and degradable thermoset polymers, is a promising tool for solving the global problem of plastic pollution. Although dynamic chemistry can construct polymer networks, it rarely introduces other functions into limits development functional materials. Herein, we develop heterocycle-based demonstrate reversibility aza-Michael addition reaction between heterocycle dihydropyrimidin-2(1H)-thione electron-deficient olefins. Our method produces linear recyclable self-healable crosslinked polymers similar to traditional but heterocycles endow with excellent ultraviolet-blocking high-energy blue light-blocking abilities, tunable fluorescence phosphorescence properties. These are difficult create ordinary chemistry. This proof-of-concept study provides insights reactions, may prompt

Язык: Английский

Процитировано

0