Synthesis and thermal decomposition kinetics of moisture curable polyurethane films as a reinforcing material for cultural relics

Abstract In situ consolidation is the most common treatment to conserve cultural relics, but materials for preserving fragile organic cultural relics in humid archaeological excavation sites are scarce. To solve the problem, a moisture-curable polyurethane (MCPU) prepolymer was synthesized by reacti...

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Autores principales:	Xing Zhao, Liqin Wang, Lang Guo, Yanni Ma, Ziming Wang, Qing Niu, Liping Zheng
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1c1f766df1fb4b838cd0a9de63379c9a
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spelling	oai:doaj.org-article:1c1f766df1fb4b838cd0a9de63379c9a2021-12-02T11:43:58ZSynthesis and thermal decomposition kinetics of moisture curable polyurethane films as a reinforcing material for cultural relics10.1038/s41598-020-78705-42045-2322https://doaj.org/article/1c1f766df1fb4b838cd0a9de63379c9a2020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-78705-4https://doaj.org/toc/2045-2322Abstract In situ consolidation is the most common treatment to conserve cultural relics, but materials for preserving fragile organic cultural relics in humid archaeological excavation sites are scarce. To solve the problem, a moisture-curable polyurethane (MCPU) prepolymer was synthesized by reacting isophorone diisocyanate with polyethylene glycol 600. The standard acetone–dibutylamine method, Fourier transform infrared spectroscopy, gel chromatography and thermogravimetric analysis were utilized to determine the change in isocyanate groups before and after the reaction, the prepolymer molecular weight, the thermal decomposition kinetic parameters and the MCPU film lifetime. The results showed that the number-average molecular weight of the prepolymer was 749, and the weight average molecular weight was 1684. Isophorone groups in the prepolymer react with moisture in the air to form colorless, transparent, flexible films. The thermal decomposition of the MCPU films was a first-order reaction, and the decomposition process consisted of two stages. The Dakin equation was used to obtain the thermal aging equation lg t = 4600.82/T − 8.07, meaning that at 15 °C, the sample has an approximately 150-year lifetime. A new conservation material was developed, and its thermal decomposition kinetics were studied, which are significant for the conservation of fragile organic cultural relics in humid environments.Xing ZhaoLiqin WangLang GuoYanni MaZiming WangQing NiuLiping ZhengNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-7 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xing Zhao Liqin Wang Lang Guo Yanni Ma Ziming Wang Qing Niu Liping Zheng Synthesis and thermal decomposition kinetics of moisture curable polyurethane films as a reinforcing material for cultural relics
description	Abstract In situ consolidation is the most common treatment to conserve cultural relics, but materials for preserving fragile organic cultural relics in humid archaeological excavation sites are scarce. To solve the problem, a moisture-curable polyurethane (MCPU) prepolymer was synthesized by reacting isophorone diisocyanate with polyethylene glycol 600. The standard acetone–dibutylamine method, Fourier transform infrared spectroscopy, gel chromatography and thermogravimetric analysis were utilized to determine the change in isocyanate groups before and after the reaction, the prepolymer molecular weight, the thermal decomposition kinetic parameters and the MCPU film lifetime. The results showed that the number-average molecular weight of the prepolymer was 749, and the weight average molecular weight was 1684. Isophorone groups in the prepolymer react with moisture in the air to form colorless, transparent, flexible films. The thermal decomposition of the MCPU films was a first-order reaction, and the decomposition process consisted of two stages. The Dakin equation was used to obtain the thermal aging equation lg t = 4600.82/T − 8.07, meaning that at 15 °C, the sample has an approximately 150-year lifetime. A new conservation material was developed, and its thermal decomposition kinetics were studied, which are significant for the conservation of fragile organic cultural relics in humid environments.
format	article
author	Xing Zhao Liqin Wang Lang Guo Yanni Ma Ziming Wang Qing Niu Liping Zheng
author_facet	Xing Zhao Liqin Wang Lang Guo Yanni Ma Ziming Wang Qing Niu Liping Zheng
author_sort	Xing Zhao
title	Synthesis and thermal decomposition kinetics of moisture curable polyurethane films as a reinforcing material for cultural relics
title_short	Synthesis and thermal decomposition kinetics of moisture curable polyurethane films as a reinforcing material for cultural relics
title_full	Synthesis and thermal decomposition kinetics of moisture curable polyurethane films as a reinforcing material for cultural relics
title_fullStr	Synthesis and thermal decomposition kinetics of moisture curable polyurethane films as a reinforcing material for cultural relics
title_full_unstemmed	Synthesis and thermal decomposition kinetics of moisture curable polyurethane films as a reinforcing material for cultural relics
title_sort	synthesis and thermal decomposition kinetics of moisture curable polyurethane films as a reinforcing material for cultural relics
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/1c1f766df1fb4b838cd0a9de63379c9a
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Synthesis and thermal decomposition kinetics of moisture curable polyurethane films as a reinforcing material for cultural relics

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