Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 66, Issue 5
Displaying 1-6 of 6 articles from this issue
  • Tadayoshi HANEDA, Seisirô ITÔ, Shin-ichi ISHIDA, Chozo YOS ...
    1993 Volume 66 Issue 5 Pages 273-279
    Published: May 20, 1993
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    The anodic oxidation of titanium was carried out by the repetition of a method so-called choppings, in which the applied voltage was linearly raised from 0 to a maximum voltage (Vp) and then was gone down to 0 at the same speed. Electrolytic baths used in this experiment were : single baths of phosphoric acid, sulfuric acid and sodium hydroxide ; a mixed bath of phosphoric acid and sulfuric acid ; and a bath added hydrogen peroxide to the mixed bath.
    As a result, when Vp was below the voltage which can ignite a spark discharge, the color of the film changed during the repetition (n) of the choppings. The films, except for the one formed in the single bath of sodium hydroxide, were colored an interference color when n<5 and gray color when n>10. The thickness of this gray-colored film was about 1.5 to 3.0 μm. However, in the single bath of sulfuric acid, the mixed bath and the hydrogen peroxide added bath, when the Vp was 150 V in the choppings, the gray-colored film was obtained at only n=1, and the color of the film changed little by increasing of n. It was implied that this reason was due to the spark discharge occurred in these baths before reaching Vp. SEM observation showed that the blister and the crack were increased with increasing n. Even after the choppings with n=20 in the single bath of sodium hydroxide, the interference-colored film, with a thickness of below 1.0 μm, was yet obtained.
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  • Radical Graft Polymerization of Vinyl Monomers from Porous Carbon Black Initiated by Peroxide Polymer Retained in the Pores
    Norio TSUBOKAWA, Hideyo TSUCHIDA, Kiyotaka KOBAYASHI
    1993 Volume 66 Issue 5 Pages 280-285
    Published: May 20, 1993
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    The radical graft polymerization of vinyl monomers from porous carbon black, i. e., Porousblack, initiated by pendant peroxide groups of poly (methyl methacrylate-co-t-butylperoxy-2-methacryloy-loxyethyl carbonate) retained in the pores was investigated. The copolymer was formed in the pores of the porous carbon black by the adsorption of the monomers and 2, 2'-azobisisobutyronitrile as an initiator followed by the polymerization by heating at 80°C. After the polymerization, the carbon black was purified by Soxhlet extraction with chloroform. Because of the copolymer formed in the pores, the specific surface area of the carbon black was decreased from 447 to 250 m2/g. It was found that the radical polymerization of vinyl monomers was initiated by the copolymer retained on carbon black to give the corresponding polymer-grafted carbon black : the percentage of grafting of the vinyl monomers was 55-60%. On the basis of the above results, it was concluded that pendant peroxide groups of the copolymer retained in the pores of carbon black had an ability to initiate the radical polymerization of vinyl monomers to give polymer-grafted carbon black based on the propagation of polymer from the surface. Polymer-grafted carbon black thus obtained gave a stable colloidal dispersion in a good solvent for grafted polymer.
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  • Seiji HAGINO, Seisirô ITÔ, Takashi NAGAI, Shin-ichi ISHIDA ...
    1993 Volume 66 Issue 5 Pages 286-289
    Published: May 20, 1993
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    An anodic oxide film of aluminum was anodic-electrolyzed in a tetraethoxysilane solution with an organic dye. As a result, the clear colored film was obtained by electrolysis at the electrolytic voltage ranging from 16 to 20 V. The heat-treated film had a superior resistance to light. It was considered that the organic dye which was embedded into the three-demensional networks of silica was deposited in the micropores of the film.
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  • Mamoru HORII
    1993 Volume 66 Issue 5 Pages 290-295
    Published: May 20, 1993
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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  • Tomoo TAKEGUCHI
    1993 Volume 66 Issue 5 Pages 296-307
    Published: May 20, 1993
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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  • [in Japanese], [in Japanese]
    1993 Volume 66 Issue 5 Pages 308-314
    Published: May 20, 1993
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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