On-demand and fast recyclable bio-epoxy

Hong, Younggi; Jeong, Jisu; Oh, Dongki; Kim, Minkook; Lee, Min Wook; Goh, Munju

doi:10.1016/j.jiec.2022.10.036

Cited by 10 publications

(7 citation statements)

References 25 publications

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“…After the curcumin epoxy resin was reacted with NaOH for an additional 48 h, its T g was 84 and 86 °C, as determined using DSC and DMA, respectively (Figures a and a). In the previous study of epoxy resins using the aldol reaction performed by our group, a tensile strength of 58 MPa was achieved; however, the tensile strength did not reach such high levels in this study. This is thought to be because the purity was lower than that of substances synthesized using natural product-based curcumin, and oligomer molecules are included in the process of attaching ECH.…”

Section: Resultsmentioning

confidence: 99%

Recyclable Curcumin-Based Bioepoxy Resin with On-Demand Chemical Cleavability

Jeong,

Ju,

Hong

et al. 2024

ACS Omega

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We synthesized a novel curcumin-based bioepoxy resin by introducing epichlorohydrin (ECH) into the hydroxyl groups of curcumin and analyzed it using Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). The epoxy equivalent weight (EEW) was determined based on a reaction with sodium hydroxide (NaOH) through titration, and the actual curing process was conducted after exploring the optimal conditions using an amine-based curing agent through dynamic scanning in differential scanning calorimetry (DSC) and isotherm analysis. The cured epoxy resin had a tensile strength, Young's modulus, and glass transition temperature (T g ) of 33 MPa, 1.4 GPa, and 86 °C, respectively. Interestingly, the diunsaturated ketone contained in the epoxy resin showed on-demand chemical cleavability, in that it had been decomposed into an aldehyde and ketone only after having been converted to a hydroxyl ketone through an oxidation reaction. The results of this study can significantly contribute to improving the eco-friendliness and recyclability of epoxy resins used in fields requiring long-term stability and chemical resistance.

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Section: Resultsmentioning

confidence: 99%

Recyclable Curcumin-Based Bioepoxy Resin with On-Demand Chemical Cleavability

Jeong,

Ju,

Hong

et al. 2024

ACS Omega

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“…45,46 The results suggest that the crosslinking density was significantly improved compared to that of the binary vitrimer. 6 Additionally, the produced material can compete with epoxybased vitrimers (0.0008 mol/cm 3 ) 27 and general epoxies (0.0118 mol/cm 3 ) 47 (such as diglycidyl ether of bisphenol A with the diamino diphenyl sulfone curing agent). The form of the modulus graph (Figure 3a) is due to the high crosslinking density of TA/BA 0.7 /PVA 3.0 .…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Robust Biobased Vitrimers and Its Application to Closed-Loop Recyclable Carbon Fiber-Reinforced Composites

Hong,

Jeong

et al. 2023

ACS Sustainable Chem. Eng.

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Vitrimers are being actively studied as sustainable plastics. To that end, robust vitrimer films fabricated from a ternary aqueous solution of tannic acid (TA), boric acid (BA), and polyvinyl alcohol (PVA) are reported herein. The trimeric vitrimer films include B−O−C dynamic covalent bonds. The optimal vitrimer film exhibits excellent crosslinking density (0.0471 mol/ cm 3 ), tensile strength (77 MPa), and modulus (3.2 GPa). A carbon−fiber-reinforced vitrimer (CFRV) was prepared with a vitrimer film and carbon fiber at temperatures above T v . The CFRV (tensile strength, 570 MPa; modulus, 21 GPa) can be used as a structural composite material. Additionally, it retains the unique recyclability and reprocessability of the vitrimer. The solution-cast film can be reproduced from the vitrimer solution prepared during recycling, and a CFRV similar to the original can be recreated by remolding the recovered carbon fiber with the reproduced vitrimer film. The synthesized biobased high-strength vitrimer films can facilitate the development of sustainable carbon−fiber-composite materials.

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“…Chemically degradable epoxy resins have excellent mechanical properties and can be selectively decomposed. 7,8 Hyunshick Youn and Younggi Hong contributed equally to this work.…”

Section: Introductionmentioning

confidence: 99%

“…Chemically degradable epoxy resins have excellent mechanical properties and can be selectively decomposed 7,8 . To synthesize chemically degradable resins, it is necessary to design a molecular structure that can selectively undergo reversible reactions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of oxime ester‐based epoxy resin with chemical recyclability

Youn

Hong

et al. 2023

J of Applied Polymer Sci

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Epoxy, a typical thermosetting resin, exhibits excellent mechanical properties, thermal stability, and chemical resistance. However, it can cause environmental pollution when discarded prior to decomposition. In this study, a novel oxime epoxy based on 1,4-benzoquinone dioxime was developed. It decomposes quickly under mild conditions and without requiring organic solvents, thus is environmentally friendly. The optimal curing temperature for benzoquinone oxime epoxy (BOE) with a curing agent was 85 C as determined by differential scanning calorimetry. In addition, the tensile strength and Young's modulus of the BOE/1,6-hexanediamine (HMDA) resin are 20 and 400 MPa, respectively, and T g is 76 C. Furthermore, thermogravimetric analysis revealed that the BOE resin was thermally stable. Interestingly, BOE/HMDA degraded in 8 h under mild conditions. This rapid degradation will facilitate the development of new chemically degradable epoxy molecules with embedded oximes and provide insights into solving the environmental problems caused by discarded epoxy resin.

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On-demand and fast recyclable bio-epoxy

Cited by 10 publications

References 25 publications

Recyclable Curcumin-Based Bioepoxy Resin with On-Demand Chemical Cleavability

Recyclable Curcumin-Based Bioepoxy Resin with On-Demand Chemical Cleavability

Robust Biobased Vitrimers and Its Application to Closed-Loop Recyclable Carbon Fiber-Reinforced Composites

Synthesis of oxime ester‐based epoxy resin with chemical recyclability

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