NIPPON GOMU KYOKAISHI
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Volume 86, Issue 9
Displaying 1-4 of 4 articles from this issue
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Regular Papers
  • Capillary Flow Behavior of the Carbon-black-filled Styrene-butadiene Rubber Compounds
    Shinsuke TANI, Junji WATANABE, Yoshiyuki IKEDA, Koichi KAWAGUCHI, Shig ...
    2013 Volume 86 Issue 9 Pages 279-284
    Published: 2013
    Released on J-STAGE: November 12, 2013
    DOIhttps://doi.org/10.2324/gomu.86.279
    JOURNAL FREE ACCESS
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    The rheological properties of carbon-black-filled styrene-butadiene rubber (SBR) compounds of various molecular weight were investigated. Melt fracture phenomena occurred dependent on quantity of added carbon-black and molecular weight of SBR. The extrusion pressure and the apparent shear-rate were determined using a capillary rheometer with the nozzles different L/D ratios. From relationships between shear stress and shear-rate, slip velocity, flow rate(Q) and slip flow rate (Qs) were estimated. At a low shear stress, the ratio of slip quantity Qs/Q showed nearly 1, but it decreased with increasing shear stress. Change of Qs/Q in the case of high molecular weight SBR samples was larger than low molecular weight SBR. From the results of dynamic strain dispersion of non-vulcanized samples, storage modulus largely decreased with increasing quantity of carbon-black filler and strain.
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  • Static State 13C NMR Chemical Shift Change induced by Magnetic Susceptibility of Natural Rubber rolled by Magic-Angle Spinning
    Masashi KITAMURA, Yoshiaki HATA, Hiroshi YASUOKA, Atsushi ASANO
    2013 Volume 86 Issue 9 Pages 285-290
    Published: 2013
    Released on J-STAGE: November 12, 2013
    DOIhttps://doi.org/10.2324/gomu.86.285
    JOURNAL FREE ACCESS
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    We investigated the effect of deformation of natural rubber (NR) on 13C NMR spectra. The deformation is occurred by the high centrifugal pressure of the fast magic-angle spinning (MAS). The static state 13C NMR spectrum of NR after MAS showed broad and apparently anisotropic peaks, while that of NR before MAS was isotropic. We concluded that the origin of the anisotropic 13C peak relates to the magnetic susceptibility difference according to the molecular orientation.
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Advanced Course on Rubber Science and Technology
  • Flame Retardant Polymeric Materials
    (II) The Basics and Recent Trends in Studies of Flame Retardant Mechanisms
    Hitoshi NISHIZAWA
    2013 Volume 86 Issue 9 Pages 291-296
    Published: 2013
    Released on J-STAGE: November 12, 2013
    DOIhttps://doi.org/10.2324/gomu.86.291
    JOURNAL FREE ACCESS
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    The studies on the combustion and flame retardant mechanisms are most important for the developments of the flame retardant materials. In this paper, the author would like to introduce the basics and the recent trends of studies in flame retardant mechanisms to develop the flame retardant polymeric materials.
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Technical Note
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