2002 Fiscal Year Final Research Report Summary
Studies on Synthesis of the Enzymic Polymerized Urushi Liquid that has Natural Drying Property under a Low Humidity Environment
| Project/Area Number |
13680181
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Cultural property science
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| Research Institution | Meiji University |
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Principal Investigator |
MIYAKOSHI Tetsuo Meiji University, Department of Industrial Chemistry, Professor, 理工学部, 教授 (00062018)
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| Project Period (FY) |
2001 – 2002
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| Keywords | anti-oxidation / Auto-oxidation / Enzymic polymerization / Laccase / Low humidity environment / Natural drying property / Urushi / Urushiol |
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| Research Abstract |
We conducted a basic experiment for the purpose of developing polymerized urushi that has a natural drying property in a low humidity environment, and examined the hardening process of the coating film with time as the urushi liquid dried by the enzymic oxidation using laccase in a constant temperature and humidity chamber. We postulated that the auto-oxidation of the side chain easily occurs in the urushi liquid due to the enzymic polymerization based on the change in the IR spectra during the drying process and anti-oxidation property of raw and sugurome urushi. And, as a result, the change in the progress time of the drying property and degree of polymerization of the urushi coating film and liquid thin phase were measured. The molecular weight distribution of the urushiol in the time that naturally dries in a low humidity environment was admitted that the monomer component decreased to 27% or less. Raw urushi undergoes enzymic oxidation by repetitive "Kurome" and decreases the urushiol monomer. Also, in this reaction, we developed a relation formula because there is a correlation in the changes, it was determined that the hydroxy value and anti-oxidization power decrease and the anti-oxidation of the side chain more easily occurs.
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