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 45, Issue 1
Displaying 1-6 of 6 articles from this issue
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  • Effect of Metals on Degradation of Vulcanized Natural Rubber
    Kenkichi MURAKAMI
    1972 Volume 45 Issue 1 Pages 2-9
    Published: January 30, 1972
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.45.2
    JOURNAL FREE ACCESS
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    The metal-catalyzed thermal-and photo-oxidation of natural rubber (pare crepe RSS No. 1) crosslinked by dicumyl peroxide has been studied by the stress relaxation method.
    The metals used were Cu, Cu2O, CuO, Mn, Fe, Co, Ni, Zn, Pb and Al. The chemical stress relaxation of these samples was mostly measured at 100°CC in air.2The metals, Cu, Cu2O, CuO, Mn and Co were effective catalysts for the thermal oxidative degradation of natural rubber. The metals, Fe, Ni, Zn and Pb, showed no effects on the thermal oxidation of rubber. However, the metals, Fe, Zn and Pb were effective catalysts for the photo-oxidative degradation. Aluminum powder retarded the stress relaxation of rubber. Copper among these metals was particularly active as a catalyst for the oxidative degradation of natural rubber. The apparent activation energy (Eα) for the thermal oxidative degradation catalyzed by copper metal was 16.7kcal/mol, while it was 27. 0 kcal/mol for the non-catalyzed one. The copper-catalyzed thermal-and photo-oxidation mechanism of natural rubber has been discussed.
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  • On the Free Fatty Acids contained within the Alkyd Resin
    Minoru NAGAKURA, Yasuo OGAWA
    1972 Volume 45 Issue 1 Pages 10-17
    Published: January 30, 1972
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.45.10
    JOURNAL FREE ACCESS
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    The determination of free fatty acids contained within the alkyd resin was carried out for olive, safflower, and soybean oils and their fatty acids modified alkyd resins of oil length 40-70 %.
    The free fatty acid parts which was fractionated by TLC of the alkyd resin added the myristic acid (GLC purity of 100%) as interior standard substance for GLC was extracted by chloroform. Then, their methyl ester was analyzed by GLC for free fatty acid composition.
    The TLC conditions are as follows.
    developing solvent ; petroleum ether : diethyl ether : formic acid
    = 70 : 30 : 2 (vol.)
    Indicator ; Iodine vapor
    Rf value of fatty acid part ; about 0.47
    The contents of total free fatty acid were about 1% for oil length 40% resin, and 2-3% for oil length 55-70 % resin, but there were no difference between the fatty acid modified and whole oil modified alkyd resins. The ratio of polyunsaturated fatty acid (linoleic and linolenic acids) in the free fatty acid composition contained within the alkyd resin was smaller than in the oil or the fatty acid of the raw materials.
    Moreover, it was found that in the fractionation by TLC of alkyd resin they showed different patterns between the pentaerythritol alkyd resin and the glycerol alkyd resin.
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  • Coating and Surface Chemistry of Plastics
    Kozo SATO
    1972 Volume 45 Issue 1 Pages 18-31
    Published: January 30, 1972
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.45.18
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  • Surface Chemistry of Polymer
    Teruo TSUNODA
    1972 Volume 45 Issue 1 Pages 32-38
    Published: January 30, 1972
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.45.32
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  • Static electrification and charge preventing of polymeric materials
    Makoto FUNATSU
    1972 Volume 45 Issue 1 Pages 39-45
    Published: January 30, 1972
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.45.39
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  • Amplification of Photographic Image and Lithographic Image on Photosensitive Ionomer
    Kazuyuki SUGITA
    1972 Volume 45 Issue 1 Pages 46-50
    Published: January 30, 1972
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.45.46
    JOURNAL FREE ACCESS
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