NIPPON GOMU KYOKAISHI
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Volume 60, Issue 6
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1987 Volume 60 Issue 6 Pages 289-297
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.289
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1987 Volume 60 Issue 6 Pages 298-305
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.298
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1987 Volume 60 Issue 6 Pages 306-309
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.306
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1987 Volume 60 Issue 6 Pages 310-312
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.310
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1987 Volume 60 Issue 6 Pages 313-315
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.313
    JOURNAL FREE ACCESS
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  • BULK MODULUS RELAXATION OF SBR PURE GUM VULCANIZATE′S SYSTEMS AND CaCO3 FILLED SBR VULCANIZATE′S SYSTEMS
    Kunihiko FUJIMOTO, Satoru TEZUKA
    1987 Volume 60 Issue 6 Pages 316-322
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.316
    JOURNAL FREE ACCESS
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    In order to study for phenomena of bulk modulus relaxation of pure gum vulcanizate systems that had various crosslinking densities and CaCO3 filled vulcanizate systems that had weak interface activite we investigated the effect that provided the relaxation with interface structure from change of relaxation spectrum forms in repeated relaxation.
    Consequently we inferred the following; in case of pure rubber systems the form of relaxation spectrum had no effects on the crosslinking structures, but in case of CaCO3 filled vulcanizate systems the structures formed microscopic voides around the interface. And we confirmed that relaxation bulk modulus were presented by an approximato equation for repeated number N and were one by one astringent in relaxation bulk modulus of matrix rubber phase.
    KR(Vf, N)=ak+bk[1-{1-vc•exp(-k•N)}•Vf]
    Here ak, bk and k is constant, Vf is volume ratio of particules and vc is volume ratio of voids of a unit particles phases.
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  • STUDIES ON THE RATE PROCESS FOR STRUCTURE CHANGING DUE TO THREE-DIMENSIONALLY STRESSED FATIGUE
    Kunihiko FUJIMOTO, Naoto MIFUNE, Shin TOKUI
    1987 Volume 60 Issue 6 Pages 323-329
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.323
    JOURNAL FREE ACCESS
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    We applied the theory of absolute reaction rate studies by Eyring to the process of layer structure formations of carbon black filled rubber vulcanizates due to three-dimensional stresses. The ratio of fracture surface energies (Γrad/Γlat)t corresponding to the degree of layer structure formation is approximated by the following equation. The ratio of fracture surface energies is 1 at the initial state and β∞ at the final state.
    (Γrad/Γlat)t=β∞-(β∞-1)×exp[-exp{-U(σx)/kT}•t]
    U(σx)=U0-α•(σx)n, n≈2
    where, β∞ is the ratio of fracture surface energies at the final state, σX is the maximum principal tensile stress, U0 is the activation energy at σX=0, α and n are constants, k is Boltzmann′s constant and T is absolute temperature. There is a relationship between critical fracture surface energies at the crack-occurring time and the principal tensile stress, which is exhibited by the following equation.
    (Γrad/Γlat)tc•(σx)m=C
    where, tc is the crack-occurring time, m and C are constants. The ratio of critical fracture surface energies, degree of layer structure formation, changes of dynamic and fracture properties at the crack-occurring time become smaller compared with those in the initial state as the stress increases.
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  • CHANGES IN HIGHER-ORDER STRUCTURE OF CARBON BLACK FILLED NATURAL RUBBER VULCANIZATES BY HEAT TREATMENT
    Shigeyuki ONO, Masayoshi ITO, Koji TANAKA, Yoshitaka UDAGAWA
    1987 Volume 60 Issue 6 Pages 330-335
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.330
    JOURNAL FREE ACCESS
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    Proton spin-spin relaxation time, swelling ratio, and elongation at break have been measured for carbon black filled natural rubber vulcanizates which were treated at 160°C for a predetermined time of 1-24hr under the aerobic condition or reduced pressure. At an initial stage of the treatment, the molecular mobilities of rubber in both quasi-glassy phase (M phase) and liquid-like phase (L-phase) increased with increasing treatment time. Such changes were observed in both samples treated under the aerobic conditions and reduced pressure. At a prolonged treatment, the mobilities of rubber molecules in the L-phase decreased with increasing the treatment time with more prominent in the samples treated under the aerobic condition. A good correspondence was observed between the changes in the spin-spin relaxation time of the L-phase and those of swelling ratio with treatment time. These results were discussed in connection with the structural changes of the samples induced by the chain scission and recombination of rubber molecules.
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  • FUNDAMENTAL STUDIES ON A TEMPERATURE ADAPTABLE STUDDED SNOW TIRE
    SLIDING FRICTIONAL PROPERTIES AND REDUCED DAMAGE OF ROAD SURFACES
    Yoshitaka UCHIYAMA, Toshio MASHITA, Toshio OCHIAI, Asahiro AHAGON, Hir ...
    1987 Volume 60 Issue 6 Pages 336-344
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.336
    JOURNAL FREE ACCESS
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    To reduce damage of road surfaces, a temperature adaptable studded snow tire has been developed and the frictional properties were examined on dry concrete surfaces and ice surfaces. A sheet of a temperature adaptable rubber was attached to the base of a spike pin. Below 0°C the rubber is harder than tread rubber. The rubber hardness drops steeply between 0°C and 10°C. At 10°C the rubber is softer than tread rubber. The frictional properties, and the abrasiveness to dry concrete surfaces were compared both with those of a snow tire without studs and a conventional studded snow tire using the model tire specimens.
    When the temperature adaptable studded snow tire slides against ice surfaces at the temparature range from-10°C to 0°C, the coefficient of friction is from 0.7 to 0.8 and shows relatively high value comparable to that of the conventional studded snow tire. The coefficient of friction is much higher than that of the snow tire without studs.
    Above 10°C the temperature adaptable studded snow tire reduces damage to dry concrete surfaces by 24 percent when compared with the conventional studded tire. However the damage of the concrete surfaces by the temperature adaptable studded snow tire is comparable to that by the conventional studded snow tire as the temperature decreases below 0°C.
    Thus the temperature adaptable studded snow tire shows good frictional properties on ice surfaces like the conventional studded snow tire, and reduces damage to road surfaces above 0°C.
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  • [title in Japanese]
    [in Japanese]
    1987 Volume 60 Issue 6 Pages 345-346
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.345
    JOURNAL RESTRICTED ACCESS
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