Mechanism of Natural Lacquer Film-Making Processes by Pyrolysis Gas-Chromatography/Mass Spectra

Wan Yun-Yang; Miyakoshi Tetsuo; Du YuMin

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Mechanism of Natural Lacquer Film-Making Processes by Pyrolysis Gas-Chromatography/Mass Spectra

Wan Yun-Yang 1 *,Miyakoshi Tetsuo 2,Du YuMin 3

1.China University of Petroleum

2.Department of Applied l Chemistry，Meiji University

3.College of Resource and Environmental Science，Wuhan University

*Correspondence author

#Submitted by

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Funding: Meiji University, Japan,Yamamoto Bunjirou Lacquer Research Fund of Kyoto-shi, Japan（No.,）

Opened online:23 February 2008

Accepted by: none

Citation: Wan Yun-Yang,Miyakoshi Tetsuo,Du YuMin.Mechanism of Natural Lacquer Film-Making Processes by Pyrolysis Gas-Chromatography/Mass Spectra[OL]. [23 February 2008] http://en.paper.edu.cn/en_releasepaper/content/18798

Natural lacquer is a complex mixture and the film-making processes are rather complicated. Many mechanisms of it existed but contradicted each other, mainly for lack of a suitable research method. A simple method using pyrolysis gas chromatography/mass spectrometry (Py-GC/MS) has been used for characterization of organic coatings. The thermal-sensitive points of lacquer polymers were analyzed and the film-making mechanism was investigated in order to put an insight into it. Based on Py-GC/MS combined with enzyme-catalyzed products analysis, two-step reaction mechanism, i.e., urushiol or laccol firstly catalyzed by enzymes forming C-C and C-O coupling small oligmers in the first stage, and then radicals mainly proceeding auto-oxidization in the air, was proposed.

Keywords:raw lacquer; urushiol; laccases; film-making mechanism; pyrolysis

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