Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
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Volume 61, Issue 7
Displaying 1-4 of 4 articles from this issue
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  • Colour and Constitution of Trimethine Cyanine Dyes
    Shigeo YASUI, Masaru MATSUOKA, Teijiro KITAO
    1988 Volume 61 Issue 7 Pages 375-380
    Published: July 20, 1988
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.61.375
    JOURNAL FREE ACCESS
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    The relationship between structure and absorption spectra of symmetric trimethine cyanine dyes was investigated by means of the Pariser-Parr-Pople (PPP) MO method.
    The results calculated on the basis of optimal parameters for hetero atoms reproduce well the values measured.
    The calculation result reveals that a sulfur atom in the ring produces a batho-and/or a hypsochromic shift of λmax. In the thiazolino cyanine, the sulfur atom acts as a donor _??_at the unstarred position to produce hypsochromic shift, while in the thiazolo cyanine, it enlarges the π-system to produce bathochromic shift.
    The introduction of a methyl group at the meso position produces the hypsochromic shift of A max in thia and selena cyanines, and the bathochromic shift in oxa and thiazolino cyanines. The hypsochromic shift of the former may be produced mainly by the meso methyl group as a donor at the unstarred position, while the bathochromic shift of the latter may be caused by the steric hindrance of methyl group predicted by the decrease of ε values. The absorption spectra of cyanine dyes may be influenced by both the steric and the electronic effects of the methine substituent.
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  • The Preparation and Durability of Epoxy Resin Paint
    Containing Zinc-coated Glass Flake
    Masanori KURODA, Kiyokatsu KUDO, Michio ARAKI
    1988 Volume 61 Issue 7 Pages 381-384
    Published: July 20, 1988
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.61.381
    JOURNAL FREE ACCESS
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    For the long protection of offshore structure, a special epoxy resin paint containing zinc-coated glass flake as a pigment was prepared and tested. The pigment was prepared by the vacuum deposition of zinc on fluidizing glass flake, and expected to have both the barrier effect of glass flake for the penetration of corrosive materials and the anodic sacrificial effect of zinc. From the salt spray test for 2,100 hr and the sea immersion test for 8 weeks, it was found the paint containing 40% of glass flake with 0. 9% of zinc showed the highest anti-corrosion performance.
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  • Recent Progress in Langmuir-Blodgett Films
    Mutsuyoshi MATSUMOTO, Yasujiro KAWABATA
    1988 Volume 61 Issue 7 Pages 385-393
    Published: July 20, 1988
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.61.385
    JOURNAL FREE ACCESS
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  • An Introduction to Technology of Paints
    Toyohiko YOSHIDA
    1988 Volume 61 Issue 7 Pages 394
    Published: July 20, 1988
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.61.394
    JOURNAL FREE ACCESS
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