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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| Format: | Article |
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Nature Portfolio
2020-12-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-020-78705-4 |
| _version_ | 1830144397393526784 |
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| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-17T10:05:33Z |
| format | Article |
| id | doaj.art-1c1f766df1fb4b838cd0a9de63379c9a |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-17T10:05:33Z |
| publishDate | 2020-12-01 |
| publisher | Nature Portfolio |
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| series | Scientific Reports |
| spelling | doaj.art-1c1f766df1fb4b838cd0a9de63379c9a2022-12-21T21:53:11ZengNature PortfolioScientific Reports2045-23222020-12-011011710.1038/s41598-020-78705-4Synthesis and thermal decomposition kinetics of moisture curable polyurethane films as a reinforcing material for cultural relicsXing Zhao0Liqin Wang1Lang Guo2Yanni Ma3Ziming Wang4Qing Niu5Liping Zheng6Key Laboratory of Cultural Heritage Research and Conservation (Northwest University), Ministry of EducationKey Laboratory of Cultural Heritage Research and Conservation (Northwest University), Ministry of EducationKey Laboratory of Cultural Heritage Research and Conservation (Northwest University), Ministry of EducationSchool of Cultural Heritage, Northwest UniversitySchool of Cultural Heritage, Northwest UniversityXi’an Cultural Heritage Promotion CenterSchool of Cultural Heritage, Northwest UniversityAbstract 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.https://doi.org/10.1038/s41598-020-78705-4 |
| spellingShingle | 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 Scientific Reports |
| title | 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_short | 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 |
| url | https://doi.org/10.1038/s41598-020-78705-4 |
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