UV-induced polymerization of urushiol without photoinitiator

Xia, Jianrong; Xu, Yanlian; Lin, Jinhuo; Hu, Binghuan

doi:10.1016/j.porgcoat.2007.08.007

Cited by 72 publications

(38 citation statements)

References 10 publications

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“…4 shows the IR spectra of the raw lacquer film that dried at 30 • C and 80% relative humidity for 0, 1, 3, 5, 7 and 18 h, respectively. The absorption peaks at 3200-3500, 1356.1, 1280.8 and 1192.9 cm −1 were due to O H vibration, ␤O H, ␥O H and C O vibration from C O H group, respectively [26,27]. Their intensities rapidly decreased with the increase of drying time, suggesting the decrease in the number of the hydroxyl group on the phenyl ring of urushiol.…”

Section: Ft-ir Spectramentioning

confidence: 96%

“…A peak at 3013 cm −1 assigned to C H vibration of the phenyl ring became weak, and the peaks' intensities at 777 and 732 cm −1 also decreased, suggesting that more substitution occurred on the phenyl ring as well. A new peak at ∼1720 cm −1 assigned to C O vibration indicated the formation of urushiol quinones [26,27]. Although its content was very low, the oxidation reaction of phenolic hydroxyl groups occurred.…”

Section: Ft-ir Spectramentioning

confidence: 99%

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Effects of polysaccharides on the properties of Chinese lacquer sap

Yang

Deng

Zhang

et al. 2015

Progress in Organic Coatings

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Section: Ft-ir Spectramentioning

confidence: 96%

Section: Ft-ir Spectramentioning

confidence: 99%

Effects of polysaccharides on the properties of Chinese lacquer sap

Yang

Deng

Zhang

et al. 2015

Progress in Organic Coatings

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“…Since the long overall duration of the traditional process is a major drawback, attempts have been made to develop alternative, more expedient curing methods. Hu and coworkers found that extracted urushiol may be photocured in 2 min by irradiation with UV light, affording a wrinkled material [94]. Hu and coworkers found that extracted urushiol may be photocured in 2 min by irradiation with UV light, affording a wrinkled material [94].…”

Section: Oriental Lacquersmentioning

confidence: 99%

Catechol‐Based Biomimetic Functional Materials and their Applications

Busquè

Sedó

Ruiz‐Molina

et al. 2014

Bio‐ and Bioinspired Nanomaterials

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A prime example of how biomaterials can inspire their fabricated counterparts is the case of catechol-based materials. Catechols are aromatic derivatives with two adjacent (ortho-) hydroxyl groups; they are ubiquitous in nature, taking part in a remarkable range of processes and functions. This functional versatility can be explained considering that catechols can act as weak acids and, simultaneously, as easily oxidizable reducing agents. In addition, the presence of two hydroxyl groups in vicinal positions in the aromatic ring makes them ideal for bidentate coordination and intermolecular interactions.Intense research has been aimed at mimicking the natural roles of catechols by developing new functional materials. This chapter will focus on past and recent studies involving the design, development, and biomimetic use of synthetic molecules and materials with catechols present in their structure, mainly in the fields of biomedicine, analytical, nanotechnology, and materials science, and showing the potential of this chemical functionality to afford promising candidate structures for technologically relevant applications.This chapter is structured considering the main functional roles of the catechol moiety in the molecules and materials fabricated, either as individual molecules or as part of a polymeric backbone. Thus, the three first sections are devoted to cases where catechols act as linkers between: macroscopic surfaces, acting as adhesives (Section 11.2); macroscopic surfaces and functional molecules (Section 11.3); and outer parts of micro-or nanoscopic structures and functional molecules (Section 11.4). Section 11.5 is focused in the role of catechols as constituent blocks of functional 2D or 3D scaffolds and structures. Next, the chelating properties of catechols and their function for metal sequestration are addressed in Section 11.6. Finally, the two last sections are centered on their presence in different sensors (Section 11.7) and electronic devices (Section 11.8), owing to the redox features of the catechol/quinone system.

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“…This makes them ideal candidates for use in radiation environments such as nuclear reactors, machines for radiation therapy, industrial sterilization, and space . According to the literature, radiation hardness of lacquer sap has not been investigated and references regarding lacquer sap (urushiol and laccol) are limited to polymerization/curing studies primarily via UV and EB radiation . Therefore, in this article, the effort was made to synthesize radiation‐hard LP and laccol‐styrene copolymers using Toxicodendron succedanea lacquer sap (from Vietnam) via cationic polymerization.…”

Section: Introductionmentioning

confidence: 99%

Synthesizing radiation‐hard polymer and copolymers usinglaccolmonomers extracted from lacquer treetoxicodendron succedaneavia cationic polymerization

Arachchilage

Patel

Harmon

2019

Polymer Engineering & Sci

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In recent years, lacquer chemistry stimulated more attention from the scientific community due to its environmental friendly applications. Additionally, the “laccol” possesses promising radiation resistance due to its highly crosslinked polymer network. In nature, lacquer polymerization is induced via enzymatic radical initiation. Herein, as a novel approach, lacquer polymer was synthesized via cationic polymerization with aluminum chloride‐ethyl acetate coinitiator. This approach was further improved by polymerizing copolymers of laccol and styrene designed for use in radiation‐hard materials. The infrared spectroscopic data clearly provide evidence for reactions with trans conjugated double bonds present in long side chain (988 and 966 cm−1 are bending vibrations of conjugated alkenes) of laccol monomer accompanying polymerization. This was further verified with proton nuclear magnetic resonance analysis. An increase in hardness was observed for all the compositions: remarkably for neat laccol polymer, and 90% and 70% laccol‐styrene copolymers after the gamma irradiation using Co‐60 gamma irradiator. Properties such as thermal stability and hardness were improved after irradiation due to the increase in physical and small amounts of chemical crosslinking. Therefore, the developed materials are suitable candidates to produce radiation‐hard polymer and copolymer coatings for aerospace operations, nuclear reactors, and medicinal and automobile sectors. POLYM. ENG. SCI., 59:1611–1623 2019. © 2019 Society of Plastics Engineers

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UV-induced polymerization of urushiol without photoinitiator

Cited by 72 publications

References 10 publications

Effects of polysaccharides on the properties of Chinese lacquer sap

Effects of polysaccharides on the properties of Chinese lacquer sap

Catechol‐Based Biomimetic Functional Materials and their Applications

Synthesizing radiation‐hard polymer and copolymers usinglaccolmonomers extracted from lacquer treetoxicodendron succedaneavia cationic polymerization

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