NIPPON GOMU KYOKAISHI
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Volume 57, Issue 2
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1984 Volume 57 Issue 2 Pages 73-79
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.73
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1984 Volume 57 Issue 2 Pages 80-92
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.80
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1984 Volume 57 Issue 2 Pages 92
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.92
    JOURNAL FREE ACCESS
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  • STUDIES ON THE FRICTION AND WEAR OF RUBBERS (I) INFLUENCE OF MECHANICAL PROPERTIES ON THE ABRASIVE WEAR OF RUBBERS
    Yoshitaka UCHIYAMA
    1984 Volume 57 Issue 2 Pages 93-101
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.93
    JOURNAL FREE ACCESS
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    The relation between wear of rubber vulcanizates rubbed against abrasive cloths and the mechanical properties was examined. The wear experiments were made with various vulcanizates such as natural rubber and SBR vulcanizates filled with various parts of carbon black, natural rubber vulcanizates filled with solid lubricants, vulcanizates equivalent to ASTM (D2228) calibration compounds, and commercially available carbon black filled rubber vulcanizates.
    The wear of rubbers seems not to depend on the ultimate elongation. However its tend to increase inversely proportional to the modulus E and the breaking strength σB. Therefore the conclusion is drawn that the wear rates increase with 1/EσB. The wear mechanisms were changed from roll formation type to scratching type with increasing the amount of the carbon black filler. The wear rates of natural rubbers filled with graphite and molybdenum disulfide (MoS2) are higher than that of the vulcanizate which is not filled with those solid lubricants. The friction of the MoS2 filled rubber is comparable to that of the rubber not filled with those solid lubricants. The friction of the graphite filled rubber is much smaller than that of the solid lubricants unfilled rubber.
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  • STUDY ON THE BULK MODULUS OF PARTICLE REINFORCED VUICANIZATES (2) STUDY ON THE CHANGE OF BULK MODULUS BY REPEATED COMPRESSION
    Kunihiko Fujimoto, Naoto Mifune, Tadahiro Ueki
    1984 Volume 57 Issue 2 Pages 102-109
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.102
    JOURNAL FREE ACCESS
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    In order to study dynamic changes of macroscopic values, for example bulk modulus, dynamic modulus and volume, of particle reinforced vulcanizates, that consist of A, B, C and particle phases (Fig. 2), we investigated the changes of microstructual elements, that are spin-spin relaxation time and interaction forces among molecular chains (physical bonds), and macroscopic values.
    Consequently we confirmed that inter action forces of physical bonds in A phase decreased and spin-spin relaxation time increased because of increases of free volume and breaking molecular chains.
    On the other hand, in C phase we confirmed that free volume decreased and volume of C phase increased because of the increase of interaction forces among molecular chains and we presented the distribution change model of molecular chain densities by repeated compression.
    In addition we examined change patterns of bulk modulus, volume and swollen network densities and finally we cofirmed that bulk modulus Xcomp (N) was changed by increase of free volume of A phase because of the decrease of molecular chain's interaction. And we presented an approximate equation about Kcomp (N),
    Kcomp(N)=[K0+γ{T2A(N)}-1]{(1-Vf)(1-C*Vf)}
    Here T2A (N) is spin-spin relaxation time of A phase, N is repeated compression number, Vf is volume ratio of particules, C* is volume ratio of a unit C phase and K0, γ is constant.
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  • Tire Manufacture and Engineering
    F. J. Kovac
    1984 Volume 57 Issue 2 Pages 110-129
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.110
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1984 Volume 57 Issue 2 Pages 134-135
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.134
    JOURNAL RESTRICTED ACCESS
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