NIPPON GOMU KYOKAISHI
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Volume 67, Issue 12
Displaying 1-13 of 13 articles from this issue
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1994 Volume 67 Issue 12 Pages 813-819
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.813
    JOURNAL FREE ACCESS
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  • Recent Trends in Rubber Elasticity Theory
    Ivan Krakovský
    1994 Volume 67 Issue 12 Pages 820-831
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.820
    JOURNAL FREE ACCESS
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    The recent theories of rubber elasticity are reviewed. To emphasize the connection existing between macroscopic (continuum mechanics) and microphysical view point on the phenomenon, the explanation starts from a description of finite deformations. Then various phenomenological formulas for the strain energy density of isotropic rubber-like materials are discussed. Finally, the classical and recent microphysical models are described and compared.
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  • [title in Japanese]
    [in Japanese]
    1994 Volume 67 Issue 12 Pages 832-833
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.832
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1994 Volume 67 Issue 12 Pages 834-838
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.834
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1994 Volume 67 Issue 12 Pages 839-851
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.839
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1994 Volume 67 Issue 12 Pages 852-853
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.852
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1994 Volume 67 Issue 12 Pages 854-855
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.854
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    1994 Volume 67 Issue 12 Pages 856-858
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.856
    JOURNAL FREE ACCESS
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  • IN SITU SILICA REINFORCEMENT OF STYRENE-BUTADIENE RUBBER BY SOL-GEL METHOD, 1
    Shinzo KOHJIYA, Aiko YAJIMA, Jae Ryong YOON, Yuko IKEDA
    1994 Volume 67 Issue 12 Pages 859-861
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.859
    JOURNAL FREE ACCESS
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    In situ silica reinforcement of styrene-butadiene rubber (SBR) was carried out by the sol-gel process using tetraethoxysilane (TEOS). SBR was sulfur-cured, and subjected to welling in tetrahydrofuran and soaking in TEOS with or without catalyst in the presence of small amount of water. The catalyst used was n-butylamine or hydrochloric acid. The swollen vulcanizates were kept at 50°C to conduct the sol-gel reaction of TEOS in the rubber matrix. The resulting vulcanizates were silica stocks by in situ filling technique, and were subjected to the tensile measurement. Increase of modulus and tensile strength at break was recogneized, which suggests inclusion of silica particles in the vulcanizates. The reinforcement effect of in situ silica was highest when n-butylamine was used as a catalyst. This method of filler compounding is promising for diene rubbers as well as for silicone elastomers.
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  • PREPARATION AND PROPERTIES OF BUTADIENE RUBBER/BROMINATED EPDM BLENDS
    Jae Ryong YOON, Shinzo KOHJIYA
    1994 Volume 67 Issue 12 Pages 862-866
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.862
    JOURNAL FREE ACCESS
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    Comparative investigation was carried out for BR/EPDM and BR/BEPDM vulcanizates. By transmission electron microscope (TEM), the morphology of the BR/BEPDM blend was observed to have smaller domain than the BR/EPDM one. Mechanical properties i. e. tensile, tear strength, abrasion, fatigue life and rubber to rubber adhesion are significantly better for the BR/BEPDM blend. Tear vs. fatigue life and tear vs. abrasion studies on the single and blended rubbers suggest that both fatigue life and abrasion are improved as the tear strength is improved.
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  • POLYMERIZATION BEHAVIOR OF ZINC METHACRYLATE STUDY OF ZINC METHACRYLATE/RUBBER/PEROXIDE COMPOUNDS; PART 2
    Yoshiomi SAITO, Koichi NISHIMURA, Misako ASADA, Akinobu TOYODA
    1994 Volume 67 Issue 12 Pages 867-872
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.867
    JOURNAL FREE ACCESS
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    The polymerization behavior of zinc methacrylate in rubber (HNBR and NBR)/zinc methacrylate/peroxide compound was investigated by measuring the quantity of unreacted Zn(MAA)2 and grafted poly-Zn(MAA)2 and the molecular weight of poly-Zn(MAA)2 and the tensile strength of the compound.
    The conversion of unreacted Zn(MAA)2 to poly-Zn(MAA)2 depends mainly on the peroxide concentration and little on the rubber. The conversion increases with the peroxide concentration. However, the peroxide concentration affects the conversion little at more than 90% conversion. The number of grafted poly-Zn(MAA)2 on NBR inversely relates to ln[uncured Zn(MAA)2] and is 4.6 times as high as that of on HNBR at 80% conversion. In the case of HNBR, the number slightly increases up to 80% conversion and sharply increases above 80%. The molecular weights of poly-Zn(MAA)2 is inversely proportional to [peroxide]1/2 at low peroxide concentration, however, is little dependent on the peroxide concentration at high peroxide concentration and high conversion. The molecular weight on NBR compound is about one fourth of that on HNBR compound. Considering the higher number of grafted poly-Zn(MAA)2, the molecular weight of poly-Zn(MAA)2 on NBR compound is defined by radical transfer to the rubber. The tensile strength of HNBR compound is higher than 50MPa above 80% conversion. These results show that Zn(MAA)2 polymerizes in solubirized state, not in solid state.
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  • DIFFERENTIAL DYNAMIC MODULUS OF POLYISOBUTYLENE, PART 4 TEMPERATURE AND FREQUENCY DEPENDENCE
    Yoshinobu ISONO
    1994 Volume 67 Issue 12 Pages 873-879
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.873
    JOURNAL FREE ACCESS
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    Simultaneous measurements of shear relaxation modulus G(γ;t) and differential dynamic storage and loss moduli G′(ω, γ;t) and G"(ω, γ;t) have been made on polyisobutylene (Mv=9.6×105) at shear strain γ=2.0. The range of temperature was 20 to 80°C. The frequency ranged from 0.04 to 0.5Hz. Both the ratios, G′(ω, γ;t)/G′(ω, 0) and G"(ω, γ;t)/G"(ω, 0) measured at various temperatures, where G′(ω, 0) and G"(ω, 0) were the initial values at the equilibrium state, followed the time-temperature superposition as well as G(γ;t) did, forming single curves irrespective of frequencies. Hence all the data of G′(ω, γ;t) and G"(ω, γ;t) can be reduced to the corresponding values at the standard temperature. The recovery of the entanglement structure is discussed using the master curves of G′(ω, γ;t), G"(ω, γ;t) and tanδ(ω, γ;t).
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  • [title in Japanese]
    [in Japanese]
    1994 Volume 67 Issue 12 Pages 880-881
    Published: 1994
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.67.880
    JOURNAL RESTRICTED ACCESS
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