Influence of TAS photoinitiator on UV-curing and performance of coating based on a bicycloaliphatic diepoxide and epoxy resin modified by black seed oil
Main Article Content
Abstract
Influence of photoinitiator triarylsulfonium hexafluoroantimonate salts (TAS) on UV-curing and performance of coatings based on 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexane carboxylate – a bicycloaliphatic diepoxide (BCDE) and epoxy resin modified by black seed oil (EBSO) have been studied. The variation of TAS and functional groups of investigated coatings during UV-exposure was followed by infrared spectrometric analysis. The properties of UV-cured coatings such as gel fraction, relative hardness, flexibility and gloss were determined. It was shown that UV-curing of investigated coatings was markedly affected by their TAS initial concentration: When TAS initial concentration in the coatings enhanced from 6×10⁻³ mole/kg to 37.5×10⁻³ mole/kg, the photolysis of TAS, consumption of epoxy groups, formation of hydroxyl and ether groups increased from 3.78×10⁻³ mole/kg, 3.47 mole/kg, 40% , 177% to 28.5×10⁻³ mole/kg, 4.4 mole/kg, 327% and 1223%, respectively, after 1.2 s of UV-exposure; At the same time the performance of the UV-cured coatings was insignificantly changed: Their gel fraction and relative hardness decreased from 84.2% and 0.86 to 69.98% and 0.78 while flexibility and gloss at 60° remained unchanged to be 10 mm and 100%.
Keywords
bicyclo-aliphatic diepoxide, black seed oil, photoinitiated cationic polymerization, triarylsulfonium salts
Article Details
References
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[4] UV/EB brochure, Radtech Europe, 2018, https://www.radtech-europe.com › Bestanden › rte...
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[6] C. Decker, L. X. Hien, N. T. V. Trieu. Photocrosslinking of functionalized rubber III.Polymerization of multifunctional monomers in epoxidized liquid natural rubber. J. Polym. Sci. Polym. Chem, vol.34, pp. 1771-1788, 1996, https://doi.org/10.1002/pola.1995.080331610.
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[9] Yusheng Shi, Chunze Yan,Yan Zhou, Jiamin Wu , Yan Wang, Shengfu Yu, Chen Ying, Polymer materials for additive manufactoring: Liquid materials, in Materials for Additive Manufacturing. 1st edition, Academic Press, 2021, pp 191-254.
[10] D. X. Thang, Study of synthesis and crosslinking of acrylated black seed oil, Ph.D. dissertation, Institute for Tropical Technology, Vietnam Academy of Science and Technology, Hanoi, 2014, 49 - 62 (in Vietnamese).
[11] T. Baye, H. Becker, S. Witzke-Ehbrecht. Vernonia galamensis, a natural source of epoxy oil: Variation in fatty acid composition of seed and leaf lipids, Industrial Crops and Products, vol. 21, no. 2, pp. 257 - 261, 2005, https://doi.org/10.1016/j.indcrop.2004.04.003,
[12] Le Xuan Hien, Do Minh Thanh, Nguyen Minh Duc. UV- curing of coatings based on black seed oil modified epoxy resin. Vietnam J.Chem., vol. 60, no. 5, pp. 615-621, 2022, https://doi.org/10.1002/vjch.202100194.