NIPPON GOMU KYOKAISHI
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Volume 39, Issue 8
Displaying 1-7 of 7 articles from this issue
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  • NON-LINEAR VISCOELASTIC PROPERTIES OF RUBBER-LIKE POLYMERS
    (PART III) SHEAR-RATE DEPENDENCE OF APPARENT VISCOSITY AND FREQUENCY DEPENDENCE OF DYNAMIC VISCOSITY
    G. Yasuda, K. Ninomiya
    1966 Volume 39 Issue 8 Pages 577-583
    Published: August 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.577
    JOURNAL FREE ACCESS
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    Steady-flow viscosities of various rubber samples were measured at relatively high rates of shear (10-110+1 sec-1.) in a range of temperature of 50100 °C.
    The real part and the absolute magnitude of the complex dynamic viscosity were calculated with appropriate approximations for each sample from the data on the stress relaxation measurements.
    Those two dynamic viscosities were then graphically compared with the apparent steady-flow viscosity of the same sample by plotting against the logarithm of rate of shear, γ for the latter and the logarithm of angular frequency, ω for the former upon the same abscissa.
    It was found in general that among those three viscosities there exists a well-known formal similarity which can be written in the form,
    η's(ω)≅ηapp(γ)|γ=Cω,
    |η*s(ω)|≅ηapp(γ)|γC*ω.
    Here η's(ω), |η*s(ω)| and ηapp(γ) represent the real part, the absolute magnitude of the complex dynamic viscosity and the apparent steady-flow viscosity, respectively. The value of the factor, C ranged from 3 to 5.
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  • STUDIES ON EFFECTS OF CALCIUM CARBONATES ON THE PROPERTIES OF POLYMERS
    (PART I) THE BEHAVIORS OF SBR UNVULCANIZATES LOADED WITH CALCIUM CARBONATES OF DIFFERENT PARTICLE SIZES AND DIFFERENT SURFACE COATING AGENTS
    H. Hata, K. Itadani, S. Hozo, F. Yokoyama, H. Kawasaki
    1966 Volume 39 Issue 8 Pages 584-589
    Published: August 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.584
    JOURNAL FREE ACCESS
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    The flow behaviors of SBR unvulcanizates loaded with various calcium carbonates of different particle sizes and different surface coating agents were investigated.
    When SBR was loaded with the filler, viscosity of filler compounds increased.
    This type of behavior may be explained by employing both the theory of rheological volume effects and the apparent free-volume decrease, considering that the results thus obtained depend on the essential difference in the restriction state between filler and rubber molecules.
    In the case of the apparent free-volume decrease, apparent activation energy is to be increased.
    In the tested filler compounds, apparent activation energy for viscous flow was in all cases nearly equal.
    There ore, it is concluded that the increasing mechanism of their resultant viscosity, when tested calcium carbonates used for loading SBR, can be discussed in terms of rheological volume effects.
    Experimental results showing that reinforcing effects of surface coating agents are better on the smaller particle size of calcium carbonates can be well explained by Ninomiya theory of effective volume.
    Further it is concluded that the concept of the theory of effective volume will also be applicable to experimental fact that the compounds loaded with calcium carbonates which are coated with thioglycollic acid-SBR latex have higher viscosity and that the similar compounds which are coated with fatty acid have lower one.
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  • STUDIES ON EFFECTS OF CALCIUM CARBONATES TO THE PROPERTIES OF POLYMERS
    (PART II) THE CURING BEHAVIORS OF SBR UNVULCANIZATES LOADED WITH CALCIUM CARBONATES OF DIFFERENT PARTICLE SIZE AND DIFFERENT SURFACE COATING AGENTS BY THE FLOW TEST
    H. Hata, K. Itadani, H. Kawasaki, S. Hozo, F. Yokoyama
    1966 Volume 39 Issue 8 Pages 590-594
    Published: August 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.590
    JOURNAL FREE ACCESS
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    Using temperature elevation method of Fow Tester, various calcium carbonates of different particle size and different surface coating agents were studied for the curing of SBR compounds.
    From the results, the following points were clarified.
    Generally, vulcanization of SBR compounds was accelerated by loading with precipitated calcium carbonates.
    Among the surface coating agents employed, SBR latex, sorbic acid and octadecylpylidiniumbromide exhibit remarkable accelerative effects.
    In case of using calcium carbonates coated with some organic agents, the compounds loaded with calcium carbonates of fine particle size gave more scorch resistance and more rapid rate of cure than large particle.
    Moreover, it was found that the approximate value of the interrelations between the characteristic values of Flow Tester and Mooney Tester which are obtainable from their respective vulcanization curve, can be computed by exponential function.
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  • BLENDING EFFECTS ON RHEOLOGICAL PROERTIES OF MULTICOMPONENT SYSTEMS
    (PART I) BLENDING LAW FOR SYSTEM OF HARD PARTICLES IN SOFT POLYMERIC MEDIA
    K. Ninomiya, E. Maekawa
    1966 Volume 39 Issue 8 Pages 595-601
    Published: August 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.595
    JOURNAL FREE ACCESS
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    Interaction effects through the interface on the viscoelastic properties of the systems of hard particles suspended in soft polymeric media are approximated to the change in the effective volume fraction of the particles and the change in the free volume of both components. Since the total deformation of the mixture is a sum of those of the components, the blending law could approximately be expressed in terms of the complex compliance, J*(ω), in the form,
    J*bl (ω) =φ1J*1 (λ1ω) +φ2J*2 (λ2ω),
    where the subscripts, bl, 1 and 2 specify the mixture, the hard and the soft components, respectively. φ and λ are the factors dependent on the interaction effects through the interface and the volume fractions of the components and others. In most cases we may expect that φ1J* (λ1ω) <<φ2J* (λ2ω).
    The effective volume fraction of the hard particle, νe, could be estimated from the equation,
    (φ2/λ2)= [1-(νe/0.74)] 2.5
    Applications of the blending law to the experimental data on the glass beadspolyisobutylene mixture by Landel gave reasonable results on the applicability of the blending law as well as the value of the effective volume fraction of the particles.
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  • Erratum
    1966 Volume 39 Issue 8 Pages 601
    Published: 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.8_601
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1966 Volume 39 Issue 8 Pages 602-621
    Published: August 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.602
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1966 Volume 39 Issue 8 Pages 648-649
    Published: August 15, 1966
    Released on J-STAGE: October 20, 2009
    DOIhttps://doi.org/10.2324/gomu.39.648
    JOURNAL RESTRICTED ACCESS
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