Recyclable high-performance glass-fiber/epoxy composites with UV-shielding and intrinsic damage self-reporting properties

Gong, Haojie; Wu, Jianqiao; Zhao, Zihan; Guo, Zhongkai; Gao, Liang; Zhang, Baoyan; Li, Min-Hui; Hu, Jun

doi:10.1016/j.cej.2022.137392

Cited by 24 publications

(20 citation statements)

References 65 publications

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“…Many researchers have incorporated covalent adaptable networks (CANs) in synthesizing recyclable epoxy resins, − including imine exchange, , transesterification, − disulfide exchange, − boronic ester exchange, , siloxane exchange, and DA/retro-DA reaction . However, due to the introduction of CANs, the dynamic networks were susceptible to creep when used in engineering and structural fields, and creeping of these materials usually occurred around the topology freezing temperature ( T v ), which was usually much lower than the T g . − Many efforts have been made to improve the creep resistance, such as through controlling the availability of cross-linking or incorporation of permanent cross-linking. − For example, Xu et al prepared a type of dihydrazone-based dynamic covalent epoxy network containing dihydrazone with an initial creep temperature of about 105 °C .…”

Section: Introductionmentioning

confidence: 99%

High-Performance Recyclable and Malleable Epoxy Resin with Vanillin-Based Hyperbranched Epoxy Resin Containing Dual Dynamic Bonds

Hao¹,

Zhong²,

Li³

et al. 2023

ACS Sustainable Chem. Eng.

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Dynamic covalent polymer networks represent new opportunities in the design of sustainable epoxy resins due to their excellent malleability and reprocessability; however, the adaptable network is usually accompanied by low glass transition temperature, poor creep resistance, and mechanical brittleness. Herein, we demonstrate a vanillin-based hyperbranched epoxy resin (VEHBP) containing disulfide and imine dynamic covalent bonds for recyclable and malleable epoxy resin with high glass transition temperature (T g ), significantly improved creep resistance, and mechanical properties. The dynamic covalent epoxy resin containing 5%VEHBP exhibited a high glass transition temperature of 175 °C and a creep temperature of 130 °C and a 34.1, 19.7, and 173.3% increase in tensile strength, storage modulus, and tensile toughness respectively, compared with the neat resin. Meanwhile, the hyperbranched topological structure of VEHBP complemented by dual dynamic bonds endowed these materials with excellent self-healing ability, reprocessability, and degradability, which represents an important step toward the design and fabrication of highperformance epoxy covalent adaptable networks.

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Section: Introductionmentioning

confidence: 99%

High-Performance Recyclable and Malleable Epoxy Resin with Vanillin-Based Hyperbranched Epoxy Resin Containing Dual Dynamic Bonds

Hao¹,

Zhong²,

Li³

et al. 2023

ACS Sustainable Chem. Eng.

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“…The structure of BOB/ETOD contains imine bonds, and the CN structure in imine bonds has the ability to absorb UV light, which is of great significance in improving the UV resistance of epoxy materials to prevent their aging and extend their service life . The transmittance spectra of BOB/ETOD and DDM/EP are shown in Figure a.…”

Section: Resultsmentioning

confidence: 99%

“…The structure of BOB/ETOD contains imine bonds, and the C�N structure in imine bonds has the ability to absorb UV light, which is of great significance in improving the UV resistance of epoxy materials to prevent their aging and extend their service life. 41 The transmittance spectra of BOB/ETOD and DDM/EP are shown in Figure 5a. It could be seen that DDM/EP showed UV-blocking properties only in 200−300 nm, while BOB/ETOD exhibited 0% transmittance in the range of 200−560 nm, suggesting that BOB/ETOD had significant blocking ability in the full wavelength range of UV light (200−400 nm).…”

Section: Thermal Stability and Flamementioning

confidence: 99%

Silicon-Bridged Epoxy Vitrimers with Antibacterial and UV-Blocking Properties

Chen

Lai

Liu³

et al. 2023

ACS Appl. Polym. Mater.

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The development of multifunctional epoxy resins that can be degradable and reprocessed is of great significance for the conservation of non-renewable resources and environmental protection. Herein, curing agents based on nitrogen−silicone Schiff base (BOB) and silica-bridged epoxy resin (ETOD) were designed and successfully synthesized. Then, ETOD was cured using BOB to fabricate a multi-silicon-bridge epoxy vitrimer containing dynamic imine bonds (BOB/ETOD). Notably, because of the presence of a large number of siloxane chain segments, BOB/ETOD exhibited excellent flame retardancy (the peak heat release rate (pHRR) was 57.7% lower than that of conventional epoxy resin (DDM/EP) and a carbon residual rate (RC 700 ) of 27.7%, which is 1.6 times higher than that of DDM/EP). Furthermore, the networks of BOB/ ETOD could topologically rearrange due to the reversible exchange reaction of imine bonds, making them degradable and reprocessable. Surprisingly, BOB/ETOD also had excellent antimicrobial (the antimicrobial rate was up to 93%) and UV-blocking properties. This work provides a simple and effective solution for the development of multifunctional epoxy-based vitrimers, which is conducive to further expanding the application field of epoxy resins.

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“…Note that this degradation strategy using external catalysts for epoxy networks is simple yet efficient. In our previous work, internal catalysts were not encouraged in epoxy vitrimers because of their influence on the curing process and networks' performance, and different methods were proposed to improve and regulate the dynamic networks, such as increasing the concentration of hydroxyl groups in networks (Wu et al, 2021), designing multiple dynamic covalent bonds (Gong et al, 2022), and mediating neighboring group participation (Zhao et al, 2022). However, the methods proposed here are much more straightforward and universal.…”

Section: Degradation Of Dgeac/mhhpa Networkmentioning

confidence: 99%

Carbon fiber-reinforced epoxy with 100% fiber recycling by transesterification reactions

Pan

Ruan

et al. 2022

Front. Mater.

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Carbon fiber (CF)-reinforced epoxy is the most commonly used advanced composite with high performance. However, these composites usually face intractable disposal problems in their lifecycles, due to the stable cross-linked network structures of epoxy. To address this dilemma, this work proposes a facile yet efficient strategy for recycling carbon fibers from traditional carbon fiber-reinforced epoxy composites using epoxy–anhydride systems as a matrix. Diglycidyl ester of aliphatic cyclo (DGEAC) and methylhexahydrophthalic anhydride (MHHPA) were used as matrix, while T300 woven carbon fiber was used as reinforcement, to construct the composites CF/DGEAC/MHHPA. The epoxy matrix exhibited a high glass transition temperature (Tg = 126°C), high decomposition temperature (Td5 = 300°C), and good solvent resistance. By using 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) as a catalyst, the DGEAC/MHHPA networks could be degraded completely in ethylene glycol (EG) at 180°C within 6 h because of transesterification reactions between EG and the networks. Taking advantage of this result, a fiber recycling process was developed for carbon fiber composites, where the cross-linked networks of epoxy could be degraded with 100% carbon fiber recycling. Furthermore, the recycled carbon fiber maintained nearly 100% similarity in surface microscopic morphology and chemical structure compared with virgin carbon fiber. This work proposes a simple and efficient strategy for recycling carbon fiber from traditional high-performance composites, offering a convenient concept for the cyclic utilization of advanced composites.

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Recyclable high-performance glass-fiber/epoxy composites with UV-shielding and intrinsic damage self-reporting properties

Cited by 24 publications

References 65 publications

High-Performance Recyclable and Malleable Epoxy Resin with Vanillin-Based Hyperbranched Epoxy Resin Containing Dual Dynamic Bonds

High-Performance Recyclable and Malleable Epoxy Resin with Vanillin-Based Hyperbranched Epoxy Resin Containing Dual Dynamic Bonds

Silicon-Bridged Epoxy Vitrimers with Antibacterial and UV-Blocking Properties

Carbon fiber-reinforced epoxy with 100% fiber recycling by transesterification reactions

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