Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 65, Issue 10
Displaying 1-6 of 6 articles from this issue
  • Suguru ITO, Kunio ESUMI
    1992 Volume 65 Issue 10 Pages 599-604
    Published: October 20, 1992
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    The polymerization of methyl methacrylate (MMA) adsolubilized in a sodium dodecyl sulfate adsorbed layer on α-alumina was studied in order to modify surface property of α-alumina. The coating process is similar to an emulsion polymerization. The amount of poly (methyl methacrylate) (PMMA) formed on α-alumina increases with an increase of added amount of MMA. Above a certain added amount of MMA, a few particles stick together because of PMMA layer formed. The dispersion stability of PMMA-coated alumina strongly depends on kinds of solvent : The highest stability is obtained in toluene, but the poorest in hexane. This behavior is attributed to the affinity between PMMA and solvents.
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  • Toshio ABO, Eiji ITOH
    1992 Volume 65 Issue 10 Pages 605-611
    Published: October 20, 1992
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    Etched areas of acrylic-melamine film on real car bodies by rain were analyzed with 3 D roughness meter, SEM and micro-FTIR for the purposes of the reproduction of the etching in a laboratory and the elucidation of the etching mechanism.
    The typical damage of a paint film was about 3 mm in diameter and its perimeter was etched deeply with maximum depth of about 1.2 μm.
    The study of etching by the spot test with acid components in rain shows :
    (1) Nitric and sulfuric acids caused damage but hydrochloric acid did not ;
    (2) Area spotted with sulfuric acid was etched, while one spotted with nitric acid was swelled.
    When acid drops get dry, hydrochloric and nitric acids evaporate, but sulfuric acid is concentrated.
    The change of chemical structure of etched area is suggested that the triazine ring is hydrolyzed to water-soluble cyanuric acid through ammeline or ammelide derivatives by concentrated sulfuric acid.
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  • Kimio MORIKAWA, Masahiko ABE, Keizo OGINO, Hideo SAWADA, Takeo MATSUMO ...
    1992 Volume 65 Issue 10 Pages 612-619
    Published: October 20, 1992
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    Perfluoro-oxa-alkylated polystyrenes (PSt-CF (CF3) O {CF2CF (CF3) O} mC3F7; m=0,1,2) having various fluoro-oxa-alkylated ratio (Rf ratio) films were prepared using various perfluoro-oxa-alkanoyl peroxides (Rf (CO) OO (CO) Rf ; Rf=CF (CF3) O{CF2CF(CF3)O}mC3F7, m=0.1, 2). The surface characteristics of the polystyrene films were studied by contact angle measurement and X-ray photoelectron spectroscopy (XPS). Critical surface tension (γc) of polystyrene films decreased with an increase in Rf ratio in the beginning, and then remained constant above a certain Rf ratio (above 13% in m=1). γc also decreased with the increase in the number of carbon, m. XPS analysis revealed that surface fluorine concentration increased in the beginning with the increase of Rf ratio and was saturated at the same Rf ratio (13% in m=1). The surface fluorine concentration was found to increase with increasing number of carbon, m. It was found that a great amount of CF3 functional groups were present on the surface of improved polystyrenes, which showed lower γc, compared with perfluoroalkylated polystyrene (PSt-CnF2n+1; n=3, 6, 7).
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  • Masumi KOISHI
    1992 Volume 65 Issue 10 Pages 620-625
    Published: October 20, 1992
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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  • Formation of Active Center in the Interlayer Space
    Toshiaki MORI
    1992 Volume 65 Issue 10 Pages 626-633
    Published: October 20, 1992
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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  • Kunio ESUMI
    1992 Volume 65 Issue 10 Pages 634-639
    Published: October 20, 1992
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
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