NIPPON GOMU KYOKAISHI
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Volume 60, Issue 4
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1987 Volume 60 Issue 4 Pages 173-180
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.173
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1987 Volume 60 Issue 4 Pages 181-192
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.181
    JOURNAL FREE ACCESS
    Download PDF (1388K)
  • [title in Japanese]
    [in Japanese]
    1987 Volume 60 Issue 4 Pages 193-199
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.193
    JOURNAL FREE ACCESS
    Download PDF (866K)
  • [title in Japanese]
    [in Japanese]
    1987 Volume 60 Issue 4 Pages 200-202
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.200
    JOURNAL FREE ACCESS
    Download PDF (471K)
  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1987 Volume 60 Issue 4 Pages 203-205
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.203
    JOURNAL FREE ACCESS
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  • EFFECTS OF SURROUNDING AND SURFACE FACTORS ON FIXING STRENGTH
    Kunio MORI, Hiroshi SAKAKIDA, Akira WATANABE, Yoshiro NAKAMURA
    1987 Volume 60 Issue 4 Pages 206-211
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.206
    JOURNAL FREE ACCESS
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    Effects of surrounding factor such as time, temperature, and relative humidity, and surface factor such as surface roughness, hardness, and surface appearance on the fixing strength (FS) were investigated. FS had a maximum value for the testing time, although it increased with an increase in testing temperature. The relative humidity has two tendencies for FS, that it increases or decreases with the humidity. The surface roughness of metal and vulcanizates leads to the decrease of FS as the contact area of metal and vulcanizates surfaces increases. The hardness of vulcanizates decreased FS since the adsorption of rubber molecular chains to metal surfaces is depressed. Metal surfaces with an organic film and a low energy surface were inactive for the fixing between metals and vulcanizates.
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  • STUDIES ON RELAXATION SPECTRUM OF DYNAMIC STRESS OF CARBON BLACK FILLED RUBBER VULCANIZATES
    Kunihiko FUJIMOTO, Hidehiko AKIMOTO
    1987 Volume 60 Issue 4 Pages 212-217
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.212
    JOURNAL FREE ACCESS
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    In this paper, we studied the relationship between the relaxation spectrum of dynamic stress and amount of weak physical bonds, broken in the process of relaxation, in SBR vulcanizates, containing various reinforcing carbon blacks, by using a transfer model, having three metastable states; and estimated the dynamic stress relaxation process with the following results:
    (1) A non-linear part in the first relaxation process results from breaking of very weak ones of physical bonds between rubber molecules. And a linear part results from formation of stable structure by re-arrangement of the particules-dispersed structure.
    (2) The second relaxation results from the relaxation of elements resistant to transformation of the system which have been stabilized in the first relaxation process and are not non-linear ones.
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  • EFFECTS OF MATERIAL FACTOR ON FIXING STRENGTH
    Kunio MORI, Hiroshi SAKAKIDA, Akira WATANABE, Yoshiro NAKAMURA
    1987 Volume 60 Issue 4 Pages 218-225
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.218
    JOURNAL FREE ACCESS
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    Effects of material factors such as metals, rubbers, fillers, curing agents, accelerators, and others on the fixing strength has been investigated in order to obtain some informations for the fixing mechanisms and the fixing-preventing method. The kind of metals had an effect on the initial fixing strength (FS0) which has a tendency to increase with the hardness of metals. FS0 was influenced by the polarity of rubbers but the fixing strength after 2 days (FS) has a little influence on the polarity. The effect of fillers such as carbon blacks and white carbon on FS is similar to that of fillers on the curing, and carbon blacks generally give the vulcanizates to accelerate the fixing but white carbons give the vulcanzates to depress it. The curing agents such as sulfur and peroxides had a great effect on FS in the kind and amount. FS increased when those give a component which reacts with metals, to vulcanizates. Accelerators which give polysulfide crosslinkages and side chains to vulcanizates, or which give curing residures such as amines and mercaptobenzothiazole to vulcanizates lead to the high fixing stength.
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  • [title in Japanese]
    [in Japanese]
    1987 Volume 60 Issue 4 Pages 226-227
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.226
    JOURNAL RESTRICTED ACCESS
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  • [title in Japanese]
    [in Japanese]
    1987 Volume 60 Issue 4 Pages 228
    Published: 1987
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.60.228
    JOURNAL FREE ACCESS
    Download PDF (128K)
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