NIPPON GOMU KYOKAISHI
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Volume 40, Issue 1
Displaying 1-13 of 13 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1967 Volume 40 Issue 1 Pages 1
    Published: January 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.1
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1967 Volume 40 Issue 1 Pages 2
    Published: January 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.2
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1967 Volume 40 Issue 1 Pages 3
    Published: January 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.3
    JOURNAL FREE ACCESS
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  • SOME APPROXIMATION EQUATINOS USEFUL IN THE PHENOMENOLOGICAL TREATMENT OF LINEAR VISCOELASTIC DATA
    PART III, APPROXIMATIONS FOR CONVERTING STATIC MECHANICAL DATA TO DYNAMIC DATA
    K. Yagii, E. Maekawa
    1967 Volume 40 Issue 1 Pages 4-7
    Published: January 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.4
    JOURNAL FREE ACCESS
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    Being based on the same procedure as in the previous reports [J. Colloid Sci., 14, 36 (1956)], approximations for converting the static mechanical to the dynamic data without differentiation of experimental data are given as equations (10), (16), (22) and (23) in the text.
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  • SOME ASPECTS OF CARBON BLACK HAVING THE HIGHER STRUCTURER
    Kumakazu Ohkita, Takashi Ogawa, Wagi Kobayashi
    1967 Volume 40 Issue 1 Pages 8-15
    Published: January 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.8
    JOURNAL FREE ACCESS
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    The high-structure carbon blacks e. g., high abrasion furnace, intermediate super abrasion furnace and etc., were treated with benzoyl peroxide in acetone at 45°C under a given condition. A plot of the amounts of benzoic acid formed during the treatment versus the BET surface areas of these carbon blacks gave a straight line, but with considerable scatter. The result may be responsible or the differences of the structure distribution.
    On the other hand, the reactions of styrene with the surface of the high-structure blacks were carried out. The graft polymers thus obtained were dispersed into toluene, and separated into two portions centrifugally.
    From the study with an electron microscope, it was found that the sedimental portion consists of high structure blacks and the upper portion of isolated particles or low structure blacks.
    On the basis of such knowledge, it may be difficult to confirm the disruption of the structure during the mixing of rubber and carbon blacks mechanically.
    So the styrene graft polymer onto high-structure black (9.8 cc/g measured by oil absorption technique) having no lower structure made by oil furnace process was treated with the mixing roll using toluene as a dispersion medium. In that case, the distruption of the carbon structure was observed clearly by the electron microscope.
    This phenomenon shows that a fresh surface of carbon black is formed.
    Therefore, when a high-structure black is milled into rubber, it is also expected that the formation of bound rubber may involve the combination of the scission sites of rubber with a fresh surface of carbon black in addition to the original surface.
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  • RHEOLOGICAL STUDIES ON TESTING METHODS OF RUBBERLIKE POLYMERS
    PART III HARDNESS. HS
    I. Furuta, S. Kusamizu, M. Nakao, K. Ninomiya
    1967 Volume 40 Issue 1 Pages 16-21
    Published: January 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.16
    JOURNAL FREE ACCESS
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    The quantity specified as hardness of rubber in.JIS is first related to the shear deformation characteristics of a viscoelastic material.
    After appropriate approximations, it is shown that there exists an approximate relation between the hardness and the relaxation modulus in shear for a sample such that;
    G(t)≅B(kp/kk)·({53.9+7.84Hs(t)}/[2.54{100-Hs(t)}])
    Here G(t) and Hs(t) are the relaxation modulus in shear and the hardness expressed in terms of dynes/cm2 and Jis unit, respectively, and both are dependent on time, t; (kp/kk) is a proportionality factor of a fixed value of 1.0 ×106 (dynes/cut). B is a factor whose vlue is expected to be insensitive to the nature of samples.
    These relations were checked well by the experimental data on various kinds of vulcanized rubber, and a value of 3.3 (cm-1) was found for B therefrom.
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  • COPOLYMERIZATION OF ETHYLACRYLATE WITH 2-CHLOROETHYLVINYLETHER
    ACRYLIC ELASTOMER PART I
    N. Kamiya, H. Matsuura
    1967 Volume 40 Issue 1 Pages 22-25
    Published: January 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.22
    JOURNAL FREE ACCESS
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    The monomer reactivity ratios for the copolymerization of ethylacrylate (EA : M1) and 2-chloroethylvinylvinylether (CEVE : M2) in benzen solution at 50 °C have been determined by the Fineman and Ross method to be γ1 ≅ 5.0 and γ2≅ 0.15. Moreover, various CEVE content copolymers prepared by a suspension polymerization on a large scale were cured with tetramine.
    The curing rate was accelerated with an increasing CEVE content in copolymer, whereas the physical properties of copolymers were scarcely changed with CEVE content in so far as it is less than 20%.
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  • DYNAMIC MECHANICAL PROPERTIES OF SBR AND POLYISOPRENE IN THE TRANSITION REGION
    LINEAR VISCOELASTIC PROPERTIES OF RUBBER LIKE POLYMERS PART II
    E. Maekawa, I. Furuta, M. Nakao, G. Yasuda
    1967 Volume 40 Issue 1 Pages 26-32
    Published: January 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.26
    JOURNAL FREE ACCESS
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    The complex dynamic moduli of two SBR and one polyisoprene samples were measured in the transition region from glassy to rubberlike consistency over a frequency range from 0.2 to 2 c.p.s. with a torsion pendulum and from 1 to 70 c.p.s.with a viscoelastic spectrometer. The temperature range for the measurements was from -80°'to 95 °C.The results showed that the temperature dependence of the mechanical data was satisfactorily described by the method of reduced variables, and that the shift factors fitted well the WLF equation in general. Simila rcharacteristics were recognized for the linear viscoelastic functions of those samples to those found generally for the amorphous polymers.
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  • MECHANICAL BEHAVIOR OF RAW RUBBER IN MOONEY VISCOMETER
    PART. VII SHEAR RATE DEPENDENCE OF MECHANICAL DATA
    G. Yasuda, M. Takashima, T. Hidaka
    1967 Volume 40 Issue 1 Pages 33-38
    Published: January 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.33
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    The shear rate dependence of mechanical data on various raw rubbers was studied with a multi-speed Mooney viscometer over a range of shear rates of 3 × 10-21.5 × 101 sec-1. The temperature range examined was 35°C120 °C.
    Eqs. (1) (3) in the text seem to be valid for all data obtained irrespective of the rate of shear.
    Among those six constants involved in Eqs. (1) (3), the values of ML0, XL, YL and AI∞ were found to increase monotonically with the rate of shear whereas the rest decrease monotonicully.
    In the Appendix, it was shown that one minute was not long enough to attain the thermal equilibrium throughout the system and a preheat period of ten minutes would be recommendable for practical purposes.
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  • [title in Japanese]
    [in Japanese]
    1967 Volume 40 Issue 1 Pages 39-49
    Published: January 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.39
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1967 Volume 40 Issue 1 Pages 50-57
    Published: January 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.50
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1967 Volume 40 Issue 1 Pages 58-59
    Published: January 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.58
    JOURNAL RESTRICTED ACCESS
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  • Erratum
    1967 Volume 40 Issue 1 Pages 63
    Published: 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.1_63
    JOURNAL FREE ACCESS
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