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- E-ISSN 2288-8985
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Analysis of dried Asian lacquer by pyrolysis/GC/MS
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2018, v.31 no.2, pp.78-87
https://doi.org/10.5806/AST.2018.31.2.78
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(2018). Analysis of dried Asian lacquer by pyrolysis/GC/MS. Analytical Science and Technology, 31(2), 78-87, https://doi.org/10.5806/AST.2018.31.2.78
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Abstract
Asian lacquer has been used as an adhesive and coating material in Asian countries, such as China, Japan, and Korea, and other southeast Asian countries. In this study, the changes in the chemical structure of lacquer with drying was analyzed using pyrolysis/GC/MS (which is useful in analyzing polymeric material) to understand its drying procedures. Upon increasing temperature, the dried lacquer was fully pyrolyzed above the pyrolysis temperature of 500 °C. The repeatability was good at the pyrolysis temperature of 500 °C (rsd = 2.6-22.3 %); however, there were differences in the pyrogram patterns when the difference in sample quantity was large. The characteristic peaks of Asian lacquer components, such as those corresponding to 1,2-benzenediol and 3-methyl-1,2-benzenediol, were detected and the compound of each peak was assigned according to the mass library. As the lacquer dried, the composition of pyrolysis products with urushiol derivatives bearing 3 C=C bonds was severely reduced compared with the ones with no C=C bonds, indicating that the polymerization is related to C=C bonds. These results can be applied to confirm the presence of lacquer in excavated relics and to monitor the changes in the composition of raw lacquer with drying.
- keywords
- Asian lacquer, pyrolysis/GC/MS, pyrolysis product, urushiol
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