Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
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Original Research Paper
  • Toshiyuki UESAKA, Satoshi ENDO, Takashi MAEDA, Hajime FURUKAWA, Shigey ...
    2019 Volume 92 Issue 9 Pages 253-259
    Published: September 20, 2019
    Released: October 11, 2019

    Fluorescent dyes applicable to agricultural fields have been newly synthesized from 5-carboxy-2-(4-hyroxylphenyl)-2H-benzotriazole and characterized in polymer films. A fluorescent polymer film exhibited an intense fluorescence band at around 410 nm (Φ=0.74) and can efficiently convert ultraviolet light into blue-violet light and shows excellent light fastness under sunlight. By using this blue-violet fluorescent film for tomato cultivation, it has been found that the lycopene content of tomato fruit is significantly increased. This increase in lycopene content is also revealed by color measurement on the surface of the skin. Increase in a * value by 2 to 6 compared to ripe tomato in control area (without film) was exhibited by a color-difference meter.

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Special Edition Materials for Inorganic Paints and Coatings
Original Research Paper
  • Takahiro GUNJI, Yudai SUZUKI, Ayako MATSUMOTO, Go KATO, Tomonori MURAK ...
    2019 Volume 92 Issue 9 Pages 262-267
    Published: September 20, 2019
    Released: October 11, 2019

    Poly(3-mercaptopropylsilsesquioxane) and poly(vinylsilsesquioxane) were prepared via the hydrolysis-condensation reactions of 3-mercaptopropyl(trimethoxy)silane and trimethoxy(vinyl)silane catalyzed by formic acid, respectively. These polymers were characterized using gel permeation chromatography and nuclear magnetic resonance spectroscopy. The storage stability was high because formic acid was converted into methyl formate and removed almost completely. Furthermore, large-scale synthesis was possible with this process. Organicinorganic hybrid coating films were prepared on silicon wafer by spin-coating and the following thiol-ene reaction of the side chains on these polymers. Pencil hardness was evaluated to be 3H to 6H which was dependent on the molecular weights of polymers.

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