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Artificial urushi.

S Kobayashi1, H Uyama, R Ikeda

  • 1Department of Materials Chemistry, Graduate School of Engineering, Kyoto University, Japan. kobayasi@mat.polym.kyoto-u.ac.jp

Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 5, 2002
PubMed
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Researchers developed a novel "artificial urushi" using enzyme-catalyzed polymerization of cardanol. This process yields a hard, high-gloss, and viscoelastic cross-linked film under mild conditions.

Area of Science:

  • Polymer Chemistry
  • Biocatalysis
  • Materials Science

Background:

  • Traditional urushi lacquerware relies on natural urushiol, which can cause allergic reactions.
  • Developing synthetic alternatives with similar properties is desirable for broader applications.

Purpose of the Study:

  • To design and prepare a novel "artificial urushi" using enzyme-catalyzed polymerization.
  • To synthesize a new cross-linkable polyphenol from cardanol.
  • To evaluate the properties of the resulting cross-linked film.

Main Methods:

  • Oxidative polymerization of cardanol using enzyme-related catalysts.
  • Laccase-catalyzed preparation of artificial urushi from urushiol analogues.
  • Curing of the synthesized polyphenol to form a film.

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Main Results:

  • A hard, cross-linked film with a high-gloss surface was produced under mild reaction conditions.
  • The artificial urushi exhibited excellent dynamic viscoelasticity.
  • Cardanol, a cashew-nut-shell liquid derivative, was successfully polymerized.

Conclusions:

  • A new, enzyme-catalyzed method for preparing artificial urushi from cardanol has been established.
  • The resulting material offers a promising alternative to natural urushi with desirable material properties.
  • This approach enables the creation of durable, high-performance coatings.