Preparation in presence of urushiol and properties of acrylate latex with interparticle bridges

Yang, Jianhong; Shen, Qin; Shen, Fengqin; Liu, Wanghui; Zhou, Ming

doi:10.1007/s11998-017-0023-6

Cited by 2 publications

(2 citation statements)

References 46 publications

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“…S5). Obviously, urushiol was not sufficient to form a stable interface layer alone due to its low hydrophilic-lipophilic balance value (< 0.8) 27 . If laccase was added to the urushiol/H 2 O system, the emulsion could be stable in 6 days ( Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Polymerization mechanism of natural lacquer sap with special phase structure

Yang

Chen

Zhu

et al. 2020

Sci Rep

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Lacquer sap is a water-in-oil natural emulsion with high viscosity. in nature, it exudes from the phloem of lacquer tree to repair its wounds in the presence of o 2. So far, it is unclear how rapid and smooth polymerization of urushiol is achieved in such a viscous sap. Here, we find that there is a diffuse interface layer with 2.43 nm of thickness between two phases. The interface layer consists of urushiol, urushiol-laccase complex, urushiol-stellacyanin complex and water-insoluble glycoprotein. Polymerization of urushiol is realized by multicomponent synergistic effect. Radicals are first formed by laccase-catalyzed oxidation of urushiol at the interface layer, then are transferred to the urushiol oil phase via wate-insoluble glycoprotein and initiate the polymerization of urushiol there. Stellacyanin inhibits the formation of certain radicals and controls the concentration of phenoxy radicals at the interface layer. Through the inhibition of radicals by stellacyanin and the electron transfer mediated by water-insoluble glycoprotein, the polymerization of urushiol at the interface layer is inhibited. This ensures that o 2 can continuously penetrate into the aqueous phase to oxidize the reduced laccase so that the urushiol polymerization can continue smoothly. this polymerization mechanism provides an idea for developing new chemical reaction systems.

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Section: Resultsmentioning

confidence: 99%

Polymerization mechanism of natural lacquer sap with special phase structure

Yang

Chen

Zhu

et al. 2020

Sci Rep

Self Cite

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“…By adding copper(II)‐modified montmorillonite (Cu(II)‐MMT) into the raw lacquer, Yang et al. prepared a series of hybrid lacquer saps [72] . The research results show that the polymerization of urushiol catalyzed by Cu(II)‐MMT is similar to that catalyzed by the laccase, and the Cu(II)‐MMT can effectively accelerate the polymerization of urushiol over a wide humidity range.…”

Section: Modification Of the Raw Lacquermentioning

confidence: 99%

Research Progress on Modification and Application of Raw Lacquer

Fang

2022

ChemistrySelect

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Raw lacquer is a kind of natural polymer coating with excellent performance. The lacquer film formed after drying of pure natural raw lacquer has the advantages of hard quality, heat resistance and corrosion resistance. However, natural raw lacquer also has some disadvantages. For example, it must be dried at a specific temperature and humidity to form a film, difficult to spray, dark color, poor alkali resistance, easy to cause human skin allergy and so on. Due to urushiol is the main film‐forming material in raw lacquer, its performance and drying film‐forming process will directly affect the properties of the lacquer film. Taking advantage of the particularity of its structure, urushiol can be modified in its drying film‐forming process, so as to speed up its drying film‐forming process or obtain a modified lacquer film with excellent performance. Thus, the research on raw lacquer and its modification mainly focuses on the modification of urushiol, the main film‐forming substance of the raw lacquer. This paper reviews the modification and combined methods of the natural urushiol by researchers in recent years, mainly including urushiol polymerization catalyzed by proton acid, urushiol polymerization initiated by UV irradiation, copolymerized with other polymer materials, reacted with metal compounds to form urushiol metal polymers, and formed composite coatings with multi‐wall carbon nanotubes, graphene oxide, nano‐TiO2 and so on. The modified lacquer has shown excellent performance in some aspects, such as the gloss and hardness of the lacquer film have been significantly improved, the heat resistance, acid and alkali resistance have been enhanced, the ageing resistance and solvent resistance have been improved, the impact strength and toughness have been enhanced, the curing time of the lacquer film has been greatly shortened and so on. Then the application fields and development trends of the modified raw lacquer are discussed, hoping to provide a theoretical basis for the further development and utilization of raw lacquer.

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Preparation in presence of urushiol and properties of acrylate latex with interparticle bridges

Cited by 2 publications

References 46 publications

Polymerization mechanism of natural lacquer sap with special phase structure

Polymerization mechanism of natural lacquer sap with special phase structure

Research Progress on Modification and Application of Raw Lacquer

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