Liquefaction of Lignin Using Chemical Decomposition and Its Application to Polyurethane Foam

Jeong, Jisu; Kim, Woo Sik; Lee, Min Wook; Goh, Munju

doi:10.1021/acsomega.1c00285

Cited by 12 publications

(8 citation statements)

References 24 publications

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“…At 700°C, a weight loss of 27 wt% was observed. Oxidized sucrose was significantly decomposed at 190°C, while the polymer resin showed a significant weight loss of bonds at 400°C 47,48 . Figure 3c additionally confirms the tensile strength and Young's modulus of the polymer resin, which were found to be 7 MPa and 515 MPa, respectively.…”

Section: Resultssupporting

confidence: 56%

Chemically decomposable imine‐based thermoset using oxidized sugar

Jeong,

Goh

2023

J of Applied Polymer Sci

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Increasing environmental concerns have driven the pursuit of sustainable alternatives to petrochemical‐based plastics in polymer chemistry. In this study, we demonstrated a method by which sugar, the most chemically produced biomass, can be used as a thermosetting resin. The sucrose was successfully oxidized, synthesized, and then incorporated into a resin. Sodium periodate (NaIO4) was used to convert sucrose into chemical raw materials. The resulting polymer, prepared via the imine reaction, exhibited a glass transition temperature Tg of 96°C, as determined by differential scanning calorimetry. Additionally, the thermosetting resin exhibited a tensile strength of 7 MPa, a modulus of 515 MPa, and a Tg of 100°C. We obtained reaction rate constants of 0.7 × 10−3 h−1 and 3.2 × 10−1 h−1 using THF and citric acid solutions, respectively. Furthermore, we reused the resin from the decomposed organic matter and confirmed that the resynthesized overall, our findings suggest the potential for green recycling by converting commonly used sugars into nature‐derived raw materials, leading to the development of eco‐friendly polymer synthesis.

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Section: Resultssupporting

confidence: 56%

Chemically decomposable imine‐based thermoset using oxidized sugar

Jeong,

Goh

2023

J of Applied Polymer Sci

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“…Synthesis and Characterization of Ag NPs. The preparation route of composite foams consists of consecutive liquefaction 30,34,35 and one-step foaming. Solid lignin was first liquefied with poly(ethylene glycol) and glycerol to obtain a liquid-like state with a uniform dispersion.…”

Section: Resultsmentioning

confidence: 99%

Antimicrobial Lignin-Based Polyurethane/Ag Composite Foams for Improving Wound Healing

Zhang

et al. 2022

Biomacromolecules

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Antimicrobial materials are an urgent need for modern wound care in the clinic. Although traditional polyurethane foams have proven to be clinically valuable for wound treatment, their petroleum-originated preparation and bioinert nature have restricted their efficacy in biomedical applications. Here, we propose a simple one-step foaming method to prepare lignin-based polyurethane foams (LPUFs) in which fully biobased polyether polyols partially replace traditional petroleum-based raw materials. The trace amount of phenolic hydroxyl groups (about 4 mmol) in liquefied lignin acts as a direct reducing agent and capping agent to silver ions (less than 0.3 mmol), in situ forming silver nanoparticles (Ag NPs) within the LPUF skeleton. This newly proposed lignin polyurethane/Ag composite foam (named as Ag NP-LPUF) shows improved mechanical, thermal, and antibacterial properties. It is worth mentioning that the Ag NP-LPUF exhibits more than 99% antibacterial rate against Escherichia coli within 1 h and Staphylococcus aureus within 4 h. Evaluations in mice indicate that the antimicrobial composite foams can effectively promote wound healing of full-thickness skin defects. As a proof of concept, this antibacterial and biodegradable foam exhibits significant potential for clinical translation in wound care dressings.

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“…The strain was determined to be 14%. Furthermore, the thermal stability was measured using TGA 23 . Figure 4b shows a graph of BOE/HMDA obtained through TGA measurements.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the thermal stability was measured using TGA. 23 Figure 4b shows a graph of BOE/HMDA obtained through TGA measurements. A weight reduction of 90 wt.% was observed at approximately 220 C. This was attributed to the weight loss caused by the decomposition of the N O C group of BOE.…”

Section: Characterization Of Cured Products Using Boe/hmdamentioning

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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Liquefaction of Lignin Using Chemical Decomposition and Its Application to Polyurethane Foam

Cited by 12 publications

References 24 publications

Chemically decomposable imine‐based thermoset using oxidized sugar

Chemically decomposable imine‐based thermoset using oxidized sugar

Antimicrobial Lignin-Based Polyurethane/Ag Composite Foams for Improving Wound Healing

Synthesis of oxime ester‐based epoxy resin with chemical recyclability

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