NIPPON GOMU KYOKAISHI
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Volume 39, Issue 2
Displaying 1-10 of 10 articles from this issue
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  • SOME APPROXIMATE EQUATIONS USEFUL IN THE PHENOMENOLOGICAL TREATMENT OF LINEAR VISCOELASTIC DATA
    PART II HIGHER APPROXIMATIONS TO RELAXATION AND RETARDATION SPECTRA FROM RELAXATION MODULUS AND CREEP COMPLIANCE WITHOUT DIFFERENTIATION
    G. Yasuda, K. Ninomiya
    1966Volume 39Issue 2 Pages 81-86
    Published: February 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.81
    JOURNAL FREE ACCESS
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    The 1st., 2nd. and 3rd. approximations to the relaxation (and retardation) spectrum from the relaxation modulus (and creep compliance) without differentiation were obtained on the same basis as in those from the complex modulus reported previously (J. Colloid Sci., 14, 36 (1959)).
    Several values of relaxation modulus equally spaced on the logarithmic time scale are used to give those approximations and the 3rd. approximation to the relaxation spectrum, H3 is written in the form,
    H3(lnθ) =[α3/(α2-1)(α-1)lnα]×{G(t)-[(α2+α+1)/α2]G(αt)+[(α2+α+1)/α3]G(α2t)-(1/α3)G(α3t)}|t=θX3(α)
    Here θ represents the relaxation time and X3(α) is the root of Eq. (23) in the text. α is an arbitrary valued parameter but a value of 0.20 is suggested for log α in actual use.
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  • KNEADER MIXING OF SBR AND CALCIUM CARBONATE
    (PART 1) INVESTIGATION OF MIXING CURVE
    H. Hata, K. Itadani, S. Hozo, F. Yokoyama, H. Kawasaki
    1966Volume 39Issue 2 Pages 87-94
    Published: February 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.87
    JOURNAL FREE ACCESS
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    The characteristics of the mixing curve showing the relationship between the torque value and the mixing time obtained through the kneader mixing of SBR and calcium carbonate are investigated.
    For ten minutes after the beginning of the mixing, R= (R0-Rc) e-αt+Rc approximately holds, which is the same as the equation in which the change of time corresponds to consumed power in Banbury mixer.
    The torque value at the steady state is directly proportional to the viscosity as measured by the Flow Tester.
    The time when the mixing of rubber and filler will be completed can be predicted from the variation of deflection range of torque value (deflection of recorder pen), and it is proved that the deflection after completed mixing of both rubber and filler entirely depends upon the elasticity of material at given temperature and given composition.
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  • ANALYSIS OF VARIOUS FACTORS WHICH INFLUENCE THE PROCESS OF MIXING OF SBR AND CALCIUM CARBONATE AND ITS PLASTICATION
    KNEADER MIXING OF SBR AND CALCIUM CARBONATE (II)
    H. Hata, K. Itadani, H. Kawasaki, S. Hozo, F. Yokoyama
    1966Volume 39Issue 2 Pages 95-99
    Published: February 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.95
    JOURNAL FREE ACCESS
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    An experiment to analyze the process of mixing SBR and calcium carbonate and its plastication using kneader mixing, has been done by the so-called the design of experiment which makes use of orthogonal array.
    It is proposed to use five characteristic values which arc obtained from mixing torque-time characteristics as data for the analysis, and to distinguish between a significant factor corresponding to mixing and plasticating process, and a negligible factor. In connection with the significant factor, its contribution was studied with the result which seems to be consistent with past experience at factories.
    Meanwhile, it was tried to find an activation constant between calcium carbonate (surface non-treated) and SBR.
    Activation constant (KN) and tensile strength (TS) of vulcanized rubber obtained by this means are expressed as follows;
    TS=81.3KN-30.9 (KN=1.021.66)
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  • SULFUR-VULCANIZATION OF CIS-1, 4 POLYBUTADIENE/POLYETHY-LENE-BUTADIENE GRAFT COPOLYMER BLENDS
    A. Furuhashi
    1966Volume 39Issue 2 Pages 100-106
    Published: February 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.100
    JOURNAL FREE ACCESS
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    For the purpose of co-vulcanization of polyethylene (PE) with rubber, PE-butadiene graft copolymer (GP), which had been prepared from low density PE and butadiene by γ-irradiation, was blended in cis-1, 4 polybutadiene (BR). Then the properties of sulfur-vulcanized BR/GP blend polymers (BG) were compared with those of sulfur-vulcanized BR/PE blend polymers (BP).
    While the Mooney viscosities of compounded BP are lower than those of BR, there are little differences between those of BG and BR. Vulcanizing rates of BG are higher than those of BR. From the sulfur vulcanized BP, PE is extracted by hot toluene, but not from BG. Therefore, it is considered that GP has been co-vulcanized with BR by sulfur in BG.
    Sulfur vulcanized BG has the higher tensile strength, modulus, tear strength and hardness than those of BP of the same PE content. It has better abrasion resistance and compression set than those of BP.
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  • A STUDY ON THE DYNAMIC EFFECTS OF ANTI-AGING AGENTS
    (PART 4) VOLATILITY AND EFFECT OF ANTI-AGING ADDITIVE FOR RUBBER
    M. Tanaka, T. Sawata
    1966Volume 39Issue 2 Pages 107-114
    Published: February 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.107
    JOURNAL FREE ACCESS
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    For the sake of a more efficient chemical action, the anti-aging additive is required to be mutually soluble and dispersive in polymers and also to have sustained effectiveness.
    Twelve kinds of commercial anti-aging additives to natural rubber have been investigated for their volatility. The results show that anti-aging additives with a lower melting point are more volatile. Volatile additives are found effective against dynamic fatigue (bending crack), but not so against thermal deterioration; additives of phenol system cannot be expected to be effective against either.
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  • [title in Japanese]
    [in Japanese]
    1966Volume 39Issue 2 Pages 115-118
    Published: February 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.115
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1966Volume 39Issue 2 Pages 119-130
    Published: February 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.119
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1966Volume 39Issue 2 Pages 131-146
    Published: February 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.131
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1966Volume 39Issue 2 Pages 147-148
    Published: February 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.147
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1966Volume 39Issue 2 Pages 149-156
    Published: February 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.149
    JOURNAL RESTRICTED ACCESS
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