NIPPON GOMU KYOKAISHI
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Volume 36, Issue 11
Displaying 1-8 of 8 articles from this issue
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  • AUTOHESION OF RAW RUBBER
    PART 1. RESULTS OBTAINED BY PICKUP TACKMETER
    G. Yasuda, K. Ninomiya, S. Ido
    1963 Volume 36 Issue 11 Pages 1001-1010
    Published: 1963
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.36.1001
    JOURNAL FREE ACCESS
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    A commercial tackmeter of Pickup type was employed to investigate the autohesion characteristics for raw rubbers by measuring the maximum tack strength and the wet area printed on the peeled surface under various experimental conditions. Three portions of different dullness spaced concentrically in the wet surface were usually distinguishable and their areas were found in general to be directly proportional to one another.
    The wet area, S, as well as the maximum tack strength, F, increased exponentially with time of contact, but seemed to level off finally. Thus we obtained the following empirical equations,
    S=S∞(1-e-tp/τp),
    F=F∞(1-e-tp/τp),
    where S∞, F∞ and τp are the constants independent of time of contact, tp.
    Comparison of those time-dependent data on tack with the relaxation moduli obtained from the separate measurements on the same sample suggests that the both processes are being governed by the mutual factor, the mobility of rubber molecules. It was then found that the dependence of the maximum tack strength on the rate of separation could reasonably be understood when the penetrated chain of the partially diffused molecule through the contact surface acts as a viscoelastic body.
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  • MASTICATION AND MIXING OF RUBBERS
    PART III. MIXING OF SBR WITH CARBON BLACK IN BANDURY MIXER
    S. Kusamizu, K. Ninomiya, S. Ido
    1963 Volume 36 Issue 11 Pages 1011-1019
    Published: 1963
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.36.1011
    JOURNAL FREE ACCESS
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    A B-type Banbury mixer was operated to mix SBR (#1500) with carbon black (Vulcan-6, Sterling-L) in full capacity (1l) at a fixed rotational velocity (60rpm).
    By analyzing the characteristic dependence of input on time, which would reflect the change in mixedness of the sample during the mixing, four typical stages of mixing process were found to exist. A qualitative discussion was given to the influence of the particle size of fillers on the lifetimes of those mixing stages.
    The mixtures obtained at various lengths of mixing time were tested in a Mooney viscometer, and the data were then analyzed in terms of the method given in the previous report. The degradation in the molecular weight of SBR during the mixing was estimated from the values of ML∞ for those mixtures with the information on the molecular weight- and the filler content-dependences of ML∞ obtained previously.
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  • STUDIES ON THE SOME QUANTITATIVE ESTIMATIONS OF MELAMINE CONDENSATES COMPOUNDED IN NON-WOVEN BINDERS (PART 9)
    H. Nishimoto
    1963 Volume 36 Issue 11 Pages 1020-1028
    Published: 1963
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.36.1020
    JOURNAL FREE ACCESS
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    For studying the physical properties of non-wovens, the author have derived the standard strength gradient “Ku, ” and then by comparing this Ku-value the author could find some interesting results. These results are as follows;
    1. The adhesive and cohesive force of non-woven binders was reinforced with melamine condensates, so the tensile strength of non-wovens increased considerably with the content of melamine, as well as the strength o binder itself.
    2. In the reactant type polymer of acrylate, the adhesive and cohesive force is more increased with melamine than in non-reactant type.
    3. On account of many cross-linkages generated between functional group in acrylate and that in melamine, dry-cleaning resistance of non-wovens was successfully obtained.
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1963 Volume 36 Issue 11 Pages 1029-1033
    Published: 1963
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.36.1029
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1963 Volume 36 Issue 11 Pages 1033-1047
    Published: 1963
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.36.1033
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1963 Volume 36 Issue 11 Pages 1048-1055
    Published: 1963
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.36.1048
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1963 Volume 36 Issue 11 Pages 1056-1064
    Published: 1963
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.36.1056
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1963 Volume 36 Issue 11 Pages 1065-1066
    Published: 1963
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.36.1065
    JOURNAL RESTRICTED ACCESS
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