NIPPON GOMU KYOKAISHI
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Volume 83, Issue 1
Displaying 1-8 of 8 articles from this issue
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Special Issue for General Reviews “Evaluation of Elastomer Characteristics”
Introductory Remarks
General Reviews
  • [title in Japanese]
    [in Japanese]
    2010 Volume 83 Issue 1 Pages 5
    Published: 2010
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2324/gomu.83.5
    JOURNAL FREE ACCESS
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  • Evaluation of Flame Retardancy for Polymer Materials
    Mikiya ITO
    2010 Volume 83 Issue 1 Pages 6-10
    Published: 2010
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2324/gomu.83.6
    JOURNAL FREE ACCESS
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    A terrible incendiary fire occurred at a subway station of South Korea on February 18th, 2003. A number of people fell victim to this terrible accident. After this accident, the interior materials of the Japanese passenger vehicle have been faced with a strong request for re-considering its performance level against a big fire, because the ordinary Japanese standard for the interior materials of a passenger vehicle have been considered only against a small fire like a cigarette. In this background, some flammability test procedures against a big fire were selected from foreign standards for examination. In this paper, based on the selected flammability test procedures, we studied and confirmed the performance level of the Japanese ordinary interior materials. In addition, based on the international movement of required flame retardant for polymer materials, an expected flame retardant technology are also proposed.
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  • Accelerated Weathering Test Methods
    Tugio AIKAWA
    2010 Volume 83 Issue 1 Pages 11-13
    Published: 2010
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2324/gomu.83.11
    JOURNAL FREE ACCESS
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    The present paper describes various testing instruments, utilized for accelerated weathering studies with few comments on features of each instrument.
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  • Evaluation Method of Gas Permeability for Elastomers
    Tetsufumi HARUSUE, Hiroyuki ONTSUKA, Yoshito OHTAKE
    2010 Volume 83 Issue 1 Pages 14-19
    Published: 2010
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2324/gomu.83.14
    JOURNAL FREE ACCESS
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    Gas permeability of high polymer is important as a physical property in the gas barrier evaluation of vehicle tires and some fuel hoses from the viewpoint of energy-loss. The precise measurement of permeability rate of oxygen and steam is recently required in the field of organic EL display and fuel cell.
    This review describes the well-known mechanism of the gas permeability in the elastomers and the classification of gas transmission rate measuring methods as standard testing methods. The relationships between gas permeability and manufacturing process factors are also introduced. By using L18 orthogonal array, the results allow not only specifying effective factors and levels but also optimizing those for gas barrier property. Among the eight factors examined, primary factor of gas permeability is found to be the type of polymer, followed by the shape of inorganic filler, while the crosslink density of vulcanized rubber is not so influential.
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  • Fatigue Testing Methods for Elastomer
    Katsuhiko TSUNODA
    2010 Volume 83 Issue 1 Pages 20-27
    Published: 2010
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2324/gomu.83.20
    JOURNAL FREE ACCESS
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    This paper reviews testing methods of fatigue crack growth behavior for elastomer. Standardized testing methods in JIS (Japan Industrial Standard) are summarized first, and fundamental literatures on fracture mechanics in elastic materials are summarized in second section. One part of author’s recent research for evaluating the contribution of cyclic crack growth component on total crack growth rate is to be explained, finally.
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Regular Papers
  • Anti-Oxidation Effects and Mechanism of Natural Rubber by Fullerene
    Hiroaki KONDO, Yoshito OHTAKE, Yoshinobu IZUMI
    2010 Volume 83 Issue 1 Pages 28-33
    Published: 2010
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2324/gomu.83.28
    JOURNAL FREE ACCESS
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    Finely dispersed C60-OH in a natural rubber improved significantly the physical properties due to the anti-aging effect. This effect arose from the facts that C60-OH could scavenge free radicals produced by the oxidative degradation and also that radicals generated from C60-OH could react with the carbon radicals and the peroxy radicals from the polymer degradation. In contrast, fullerenes like C60, C70, and C84 actually promoted the aging instead of the anti-aging effect, because C60, C70, and C84 finely dispersed in natural rubber could generate an active singlet oxygen produced by the photosensitized reactions in addition to the radicals caused by the oxidative degradation during the sample processing.
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Technical Note
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