NIPPON GOMU KYOKAISHI
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Volume 54, Issue 4
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1981Volume 54Issue 4 Pages 201-215
    Published: 1981
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.54.201
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1981Volume 54Issue 4 Pages 215
    Published: 1981
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.54.215
    JOURNAL FREE ACCESS
    Download PDF (65K)
  • [title in Japanese]
    [in Japanese]
    1981Volume 54Issue 4 Pages 216-229
    Published: 1981
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.54.216
    JOURNAL FREE ACCESS
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  • CHEMICAL RECLAMATION OF USED TIRES (IV.)
    MECHANO-CHEMICAL RECLAMATION OF USED TIRES AT HIGH TEMPERATURE
    Junji FURUKAWA, Hiroshi OKAMOO, Shinji INAGAKI, Yukio ONOUCHI, Shiro A ...
    1981Volume 54Issue 4 Pages 230-234
    Published: 1981
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.54.230
    JOURNAL FREE ACCESS
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    A search for effective reclaiming agents was carried out, and the physical properties of reclaimed rubbers and revulcanizates were examined by a mechano-chemical reclaiming method for crushed used tires using a Banbury internal mixer and a Brabender plastograph at temperatures of 100°C to 150°C. Diphenyl hydrazon, the combination of thiophenol or dimethyl sulfone with phenyl hydrazon for Banbury internal mixer method, and p-toluene sulfinic acid, triphenyl phosphine, quanternary ammonium salts and phenolic antioxidants for Brabender plastograph one were found to be more effective reclaiming agents. The tensile properties of revulcanizates thus obtained showed a tendency to be inferior to those of ones reclaimed mechano-chemically with a roll at lower temperature.
    From these results, the degradation mechanism of vulcanizates at high temperature may be considered as an oxidative degradation.
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  • CHEMICAL RECLAMATION OF USED TIRES (V)
    CHEMICAL RECLAMATION OF USED TIRES BY OIL-PAN PROCESS
    Junji FURUKAWA, Hiroshi OKAMOTO, Shinji INAGAKI, Yukio ONOUCHI, Shiro ...
    1981Volume 54Issue 4 Pages 235-242
    Published: 1981
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.54.235
    JOURNAL FREE ACCESS
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    The reclamation of crushed waste tires was carried out by an application of ordinary oil-pan process in the presence of some kinds of reclaiming agents and oil at 130°C-200°C, and then, the influences of reclaiming agents, oils and treating temperatures on the plasticity of reclaimed rubbers and the physical properties of re-vulcanizates were examined.
    As the result, it was found that the plasticity of reclaimed rubbers was affected mainly by the treating temperatures, and the physical properties of re-vulcanizates were influenced obviously by the kind of reclaiming agent and oil. Re-vulcanizates having good tensile properties were obtained by the use of binary reclaiming agents composed of thiol and amine compounds.
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  • The Application of Chemorheology on the Radiation Damage of Polymer (2)
    The Synergism of Heat and Radiation in Chemoreology
    Masayuki ITO
    1981Volume 54Issue 4 Pages 243-248
    Published: 1981
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.54.243
    JOURNAL FREE ACCESS
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    Chemical stress relaxation of chloroprene rubber was studid under combined environment of heat and radiation.
    Co-60γ ray was irradiated at various temperatures ranging from 100°C to 150°C. Each decay curve is found to be Maxwellian after a certain period of time. The activation energy of the chemical stress relaxation decreases by irradiation. The rate of the stress decay by irradiation is proportional to 0.85 power of dose rate at 120°C.
    A simple additivity between the rate of stress decay by heat K(h), by radiation K(r) and by heat and radiation K(h+r) was not observed. And the rate of decay was expressed by the following eq.
    K(h+r)=Const×Iαexp(-E'/T)+K(h)
    Where I is dose rate, T is temperature (°K), α is the dose rate dependence and E' is the coefficient of synergism which is proposed in this paper.
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  • STUDIES ON STRENGTH OF ELASTOMER BASED COMPOSITES (I) OPTIMUM AMOUNT OF VULCANIZING AGENT FOR THE STRENGTH OF VULCANIZATES CONTAINING COMMINUTED VULCANIZATES
    Kunihiko FUJIMOTO, Toshio NISHI, Takaharu KUBO
    1981Volume 54Issue 4 Pages 249-256
    Published: 1981
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.54.249
    JOURNAL FREE ACCESS
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    Tensile strength of SBR vulcanizates containing comminuted vulcanieates has been studied by changing the amounts of rubber powder and the vulcanizing agent. The vulcanizing agent is distributed in the rubber powder and rubber matrix due to the diffusion and reaction of the agent in the composite.
    The tensile strength, TB and the elongation at break, EB of the composite are found to become maximum when the crosslink density of the matrix rubber equals the crosslink density of the unfilled rubber with maximum tensile strength. The relationship between the maximum TB and EB of the composite and the volume fraction of the rubber powder, Vf is
    dTB/dVf=aT•TB, dEB/dVf=aE•EB
    where aT and aE are negative constants.
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  • [title in Japanese]
    1981Volume 54Issue 4 Pages 257-258
    Published: 1981
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.54.257
    JOURNAL RESTRICTED ACCESS
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