ACS Sustainable Chemistry & Engineering
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2025
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IF 7.3
Yujun Zhou,Nan Nan Xia,Jialu Zhang,Tianxiang Li,Jianmin Wang,Qin Wu
The repeated bonding properties of wood adhesives directly influence the service life of wood. The covalent cross-linked networks of conventional thermosetting wood adhesives endow them with excellent performance but suppress the mobility of molecular chains, hindering the repeated bonding after adhesive failure via molecular chain reorganization. Here, we develop a thermoplastic hyperbranched polyurethane wood adhesive, which contains a prepolymer composed of cashew phenol, polyol, and isocyanate groups as the branching chains, a hyperbranched polyester as the core, and lipoic acid with disulfide (S–S) bonds as the terminal groups. When this adhesive breaks or cracks under external force and the broken surfaces are joined together, the molecular chains on both sides of the adhesive converge toward the breakage points driven by the highly branched structure of the hyperbranched polymer, promoting contact between the S–S bonds on both sides. Under heating conditions, dynamic reversible exchange reactions occur, stitching the cracks, and enabling the adhesive to bond repeatedly. Benefiting from this advantage, HPU-LA (100%) can retain more than 85% of its original bonding strength even after undergoing five repeated bonding cycles at 80 °C. This study addresses the issue of resource waste caused by the nonreusability of conventional adhesives as well as has notable research implications for extending the service life of wood.
研究领域:
材料科学
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林业工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2021
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IF 5.645
Qin Chen,Zhenhua Gao,Long Bai,Zhen Xu,Jiyou Gu
To improve the performance of waterborne materials, this study attempts to prepare a novel water-dispersible isocyanate crosslinking agent based on plant-based castor oil. The intermediate maleated castor oil and water-dispersible isocyanates with different R values [n(NCO)/n(OH)] are prepared and characterized by FTIR and 1 H NMR. The viscosity test, isocyanate content titration, particle size analysis, and the morphologies indicate that the optimal condition for the water-dispersible isocyanates (e.g., best storage stability and particle size distribution) is at R value = 40. The mechanical test proves that the water-dispersible isocyanates can greatly improve the bonding strength and water resistance of wood adhesives, showing an increase of wet strength to be as high as 146 % and 506 % for urea-formaldehyde resin and white latex, respectively. The castor oil-mediated water-dispersible isocyanate system opens a novel avenue to synthesize waterborne crosslinking agent for applications in adhesives, coatings, and structural materials.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Zhi Li,Haipeng Cai,Antonio Pizzi,Xianghong Li,Jun Zhang,Guanben Du,Yun Lu,Shuduan Deng
Cost-effective and sustainable biomass-based materials are being explored as alternatives to formaldehyde-based adhesives. However, the direct application of pure biomass materials for bonding purposes does not yield satisfactory results. Graft copolymerization is a widely recognized method for chemical modification. In this study, a novel formaldehyde-free wood adhesive was synthesized through graft copolymerization using N -methylolacrylamide (NMA) and cassava starch (CS). The physical and chemical properties, reaction mechanisms, and bonding mechanisms of the adhesive were thoroughly investigated. Characterization techniques such as FTIR, NMR, XPS, and SEM confirmed significant improvements in the properties of the graft copolymer adhesive, attributed to increased crosslinking density and the formation of highly interconnected structures. The cured adhesive demonstrated exceptional plywood bonding performance and water resistance, with shear strengths of 1.31 MPa (dry strength), 1.01 MPa (cold water strength), and 0.91 MPa (hot water strength), representing a substantial improvement over pure CS adhesive. This straightforward and economically viable strategy offers a promising avenue for developing biomass formaldehyde-free adhesives and promoting advancements in the wood industry.
研究领域:
材料科学
·
林业工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Advances
·
2023
·
IF 5
Xamxikamar Mamat,Zehong Gao,Longyi Chen
Over use or long term exposure of acetaminophen (APAP) could cause severe damage to human health. Currently APAP related events is still a global burden. Therefore, secure management of APAP is important for avoiding possible APAP induced incidents. Rapid sensing of APAP in human body fluids can help in better moniotoring of the health condition and provide information for necessary medical aid. Electrochemical sensor utilizing functional nanomaterials and nanostructures have been proved to be a facile approach for sensing APAP in human body fluids. Among various fucntional nanmaterials, the transition element doped Fe3O4 nanoparticle decorated carbon materials have found extensive applications in catalysis, energy and environmental etc. areas. In order to explore the versatility of Zn doped Fe3O4 nanoparticle incorporated with biomass carbon electrocatalyst in electrochemical sensing area, we prepared the N, S and P doped biomass carbon material (NSP-BC) from the biomass of Elaeagnus Angustifolia gum through pyrolysis approach. Then, facile one-pot polyol solvothermal synthesis method was adpoted for deposition of Zn doped Fe3O4 nanoparticle onto the NSP-BC. Among the synthesized electrocatalysts, the Zn/Fe ratio of 0.132 electrocatalyst was found to show the highest Ipa response current towards APAP molecule. The electrocatalysts were systematically characterized by scanning electron microscope, energy-dispersive X-ray spectroscopy, element mapping, X-ray photoelectron spectroscopy, X-ray powder diffractometer, Raman spectroscopy, inductively coupled plasma-optical emission spectroscopy and electrochemical analysis. The electrocatalyst modified glassy carbon electrode sensor achieved a wide linear sensing range of APAP from 2.5 to 500 μM covering urinary physiological APAP concentration range with a limit of detection of 63.9 nM and a sensitivity of 0.64 μA μM-1 cm-2. The electrocatalyst modified GCE sensor also exhibited satisfactory recovery rates of APAP in urine samples. This facile synthesized Zn-doped Fe3O4 nanoparticle @ NSP-BC electrocatalyst has potential application in clinical diagnostics and pharmaceutical analysis.
研究领域:
材料科学
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电化学
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纳米技术
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分析化学
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生物材料
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药学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）