PROGRESS IN ORGANIC COATINGS
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2025
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IF 7.3
Jianfeng Zhu,Junjie Huang,Jianhong Yang,Jun Cai,Guoxiang Li
Lacquer sap is a precious natural emulsion collected from lac tree, mainly used as a coating. In order to improve its performance and reduce its usage cost, styrene was mixed into raw lacquer sap for modification. Under an oxygen atmosphere, the copolymerization of styrene and urushiol was achieved through the catalysis of laccase contained in the raw lacquer sap. The copolymerization process was characterized by GPC and NMR. To maintain the fluidity of the copolymerized lacquer, styrene couldn't be completely polymerized. Excessive reaction time could lead to explosive polymerization. Thus, controlling reaction time was particularly important. The copolymerized lacquer had a shorter drying time than the raw lacquer sap. The results from NMR, FT-IR, pyrolysis GC–MS and UV–Vis spectra showed that styrene had successfully polymerized into the dry lacquer film. Due to the introduction of styrene, the color of the lacquer film changed from dark brown to light yellow, and its pencil hardness and flexibility were improved, reaching 5H and 2 mm, respectively, while maintaining its excellent resistance to organic solvents. In addition, the thermal stability of the lacquer film was improved as well.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 71
·45034-45044
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IF 3.108
Yajun Deng,Weibin Bai,Jipeng Chen,Xinmei Zhang,Shenji Wang,Jinhuo Lin,Yanlian Xu
Protective corrosion coatings are preferably composed of available, environmentally friendly, and low-volatility organic compounds. Herein, new excellent corrosion graphene/raw lacquer composite coatings were formed, in which waterborne graphene was modified by taking lignin tripolymer (LT) as an aqueous stabilizer and subsequently adding to raw lacquer (RL). Graphene/lacquer composite coatings were achieved by an eco-friendly fabrication process. The structure and thermostability of the lignin derivative were studied by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetry (TG), respectively, while the composition of the LT was characterized by Raman spectrometry. And the experimental result revealed that LT was an effective graphene dispersant (LTG) up to 60 d without any precipitation. Besides, the SEM of the graphene/lacquer coatings revealed that the excellent protection properties were highly attributable to the formation of a very rough surface, because of the highly dispersed nature of the graphene nanoparticles. Also, the corrosion behavior of the composite coatings on a metal substrate were studied by polarization curve analysis and electrochemical impedance spectroscopy (EIS). According to the electrochemical corrosion tests, the lacquer composite coating with 5 wt% LTG dispersion (RL/LTG-5, containing 0.3 wt% graphene) possessed excellent corrosion resistance, making it suitable for protecting bare metal substrates.
研究领域:
材料科学
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电化学
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环境保护
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DOI
高影响因子
MATERIALS LETTERS
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2014
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IF 2.269
Longhui Zheng,Qinhui Chen,Baoling Chen,Jinhuo Lin
Janus materials with anisotropic chemical structure and physical properties have attracted increasing attention due to their diversified potential applications. However, existing organic parts of Janus particles mainly come from synthetic polymer . Urushiol is a kind of natural renewable product. Herein, we described the synthesis and functionalization of urushiol-titanium chelate polymer (UTi)-polystyrene (PS) Janus composite particles . The core@shell composite particles of PS@UTi was obtained through in-situ reaction between sulfonated polystyrene microspheres and UTi. UTi-PS Janus composite particles were synthesized by swelling assisted protrusion. Both of the two knobs of Janus particles could be modified. For example, polyaniline (PANi) could be favorably grown on the PS knob by specific interactions. Results of characterization indicated that the Janus composite particles of UTi-PS containing natural product have been synthesized and modified successfully. The modified product of UTi-PANi Janus composite particles is expected to serve as directional conductive material and heat-resistance polymer material.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2025
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IF 2.5
Zhanghong Guo,Lin Zhou,Haining Cui,Jin-Xin Ma,Chan Wang,Qijun Song
Natural laccase, a member of the copper blue oxidase family, has its catalytic sites are classified as type1 (T1), type2 (T2) and type3 (T3) Cu. The electron transfer distance between the T1 to T2/T3 Cu has a great effect on the electron transfer efficiency in the laccase-catalyzed reaction. To mimic the active sites of laccase, a copper-doped carbon dots (CuCDs) was synthesized by a one-step hydrothermal treatment of copper sulfate and riboflavin. Experiment characterizations and theoretical simulations revealed that the catalytic sites in CuCDs consist of N, O coordinated copper and quinoxaline structure, which resemble the coordination environment of T2 Cu and the function of the T3 Cu center, respectively. The short electron transfer distance of 4.8 Å in catalytic sites of CuCDs accelerates the oxidation of the substrate dopamine (DA) to polydopamine (PDA) with a reaction rate being 40 times faster than that of laccase. Galvanic cell experiments proved that electron transfer from DA to oxygen was achieved in the presence of CuCDs. Therefore, this study not only could provide an efficient and eco-friendly nanozyme for hair dyeing in ambient condition, but also could inspire more and deeper researches in the field of mimicking natural enzyme with carbon nanomaterials.
研究领域:
生物化学
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纳米材料科学
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催化反应研究
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）