NIPPON GOMU KYOKAISHI
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Volume 67, Issue 5
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1994 Volume 67 Issue 5 Pages 317-336
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.317
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1994 Volume 67 Issue 5 Pages 337-338
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.337
    JOURNAL FREE ACCESS
    Download PDF (238K)
  • [title in Japanese]
    [in Japanese]
    1994 Volume 67 Issue 5 Pages 339-347
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.339
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1994 Volume 67 Issue 5 Pages 348-351
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.348
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1994 Volume 67 Issue 5 Pages 352-353
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.352
    JOURNAL FREE ACCESS
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  • ACTIVATION OF THE PEPTIZING EFFECT SOME ORGANIC CHEMICALS BY FE-PHTHALOCYANINE
    Takashi WATANABE
    1994 Volume 67 Issue 5 Pages 354-358
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.354
    JOURNAL FREE ACCESS
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    The addition of small amounts of Fe-phthalocyanine (Ph-Fe) to rubber/thiazole systems resulted in the improved peptizing effect. In the rubber system containing 40% of MBT, the addition of 5% of Ph-Fe decreased the Mooney viscosity (67) very much, i.e., decrease from the viscosity (90) without Ph-Fe activator or the viscosity (85) for the system only with MBT. MBT itself has no peptizing effect, but the addition of Ph-Fe activator to the rubber system containing MBTS resulted in the reduced Mooney viscosity (70). The activator was also effective for the ZnMBT-containing system (Mooney viscosity: 60). An increase in the amount of addition of the vulcanization accelerator or the activator showed the improved peptizing effect. The rubber chemicals other than thiazoles, that can give ben-zothiazyl thiyl radicals, has no peptizing effect, because of the difficulty in the formation of thiyl radical (MMB), the stability of the radical (TMTD), or the interferences by some degradation products such as amines formed from sulfenamides.
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  • STUDY ON THE MEASURING AND VISUALIZATION OF CONTACT PRESSURE DISTRIBUTION OF RUBBER AND TIRE
    Hideo SAKAI
    1994 Volume 67 Issue 5 Pages 359-368
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.359
    JOURNAL FREE ACCESS
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    Contact condition of a tire and the road surface have a close relation to various properties of the tire, and are the most important characteristics in evaluating the performance of the tire. In this research, first a new device for measuring and visualization of contact pressure distribution was developed. The measuring principle of this new device is that the rubber is made in contct with the total reflection surface of a large optical prism, then the absorptance of the total reflection of the light in the whole contact area is measured as a set of points and the contact pressure distribution is calculated. By measuring the contact pressures when a rubber disk was pressurized in a flat form with this device, it was found that the pressure distribution was not even but varied greatly depending upon the height and diameter of the rubber disk. And the variation could be explained by the spring effect, the liquid effect and the edge effect of the disk. Next, by measuring and visualization of contact pressure distribution of the loaded tire proved that an image with a very high definition was obtained that displays the true contact area, the shape of the area and the pressure distribution, by which the irregular wear was easily detected. Also made clear were the deformation of the contact area and changes in the pressure distribution in the tread rubber block, when some lateral force was applied on the loaded tire.
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  • STUDY ON DURABILITY OF NR-CORDS ADHERENDS III RECOVERY OF ADHESION STRENGHT IN NR-STEEL CORD ADHERENDS AGED IN HOT WATIR AND THEIR TWICE WATER AGING
    Kunio MORI, Saiso KIMU, Hidetoshi HIRAHARA, Yoshiyuki OISHI, Hiroshi H ...
    1994 Volume 67 Issue 5 Pages 369-375
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.369
    JOURNAL FREE ACCESS
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    NR vulcanizates decreased tensile strength adsorbing water in water aging and decomposing at 95°C. Exposure of the aged NR vulcanizates in a dry environment evaporated water and increased their tensile strength. NR vulcanizates adsorbed the small amount of water and aged for a short time recovered tensile strength with low level, but the vulcanizates adsorbed the large amount of water and aged for a long time did it with high level. NR-cord adherends aged in hot water increased peel strength and rubber coverage during standing at a dry environment. The peel strength and rubber coverage were high for samples aged for a long period and with high sulfur content and for samples prepared by the Co formulation more than the base formulation. The increase of peel strength means that of overall strength in the adherends and the increase of coverage does that of strength in the cord side of adherends. Those two results suggest that the recovery of adhesion strength occurred in both cord and rubber sides. The recovered NR-cord adherends were again aged at 95°C in water. The intermittent water aging gave higher peel strength and rubber coverage to the adherends than the continuous water aging.
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  • ADHESION OF RUBBER TO METAL AND ALLOY, PART 3 CURE-ADHESION OF RUBBER TO ELECTROLESS Ni ALLOY DEPOSIT
    Yoshiyuki IKEDA, Hidemi NAWAFUNE, Shozo MIZUMOTO, Kiyoshi IKEDA, Koich ...
    1994 Volume 67 Issue 5 Pages 376-382
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.376
    JOURNAL FREE ACCESS
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    The cure-adhesion of rubbers (NR and SBR) to electroless Ni-Cu-P alloy deposits and the adhesion mechanism have been investigated. In these cure-adhesion, the good adhesion strength and the good hot water resistance were obtained by using of Ni-Cu-P alloy deposit which the Cu contents were from 0 to 20mol%, and the adhesion behavior was the cohesive failure. But, at more than over 20mol% Cu, the more Cu contents increased, the lower rubber coverage on failure surface decreased. When the alloy contained more than 50mol% Cu, the adhesion behavior was the cohesive/interface failure or interface failure.
    The analysis of adhesion interface by an electroprove microanalyzer and X-ray photoelectron spectroscopy suggested to be formed of thin sulfide film on adhesion interface.
    From these results, it is found that the important factors of using metal and alloy were to have a thin and tightly sulfide film.
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  • [title in Japanese]
    [in Japanese]
    1994 Volume 67 Issue 5 Pages 383-384
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.383
    JOURNAL RESTRICTED ACCESS
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