NIPPON GOMU KYOKAISHI
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Volume 44, Issue 8
Displaying 1-9 of 9 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1971 Volume 44 Issue 8 Pages 633-644
    Published: August 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.633
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    1971 Volume 44 Issue 8 Pages 645-654
    Published: August 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.645
    JOURNAL FREE ACCESS
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  • FAILURE PROCESS (PART I)
    STUDY ON FAILURE MECHANISM OF RUBBER VULCANIZATES (VII)
    K. Fujimoto, T. Migita, T. Kasuya
    1971 Volume 44 Issue 8 Pages 670-678
    Published: August 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.670
    JOURNAL FREE ACCESS
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    From a morphological study on fractured surfaces and a statistical treatment of failure characteristics in carbonblack-filled SBR vulcanizates, the failure process of rubber under constant-rate elongation is divided into the following five mechanisms.
    (I) Normalization of internal stress distribution due to break-down of few rubber molecules.
    (II) Growth of specific molecular group which will be the core of fructure.
    (III) Fracture of above mentioned molecular group.
    (IV) Propagation of fracture energy to the environmental rubber molecules.
    (V) Expansion of fracture surfaces due to the stress concentration.
    While the first and second processes are structure in sensitive, the other processes show the statistical and brittle fracture characteristics.
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  • STRESS RELAXATION OF BR AND IR VULCANIZATES ADDED WITH AMINE TYPE ANTIOXIDANTS
    A STUDY ON DETERIORATION AND STABILITY OF BR AND IR (V)
    M. Tanaka, T. Sawata, H. Ôe
    1971 Volume 44 Issue 8 Pages 679-685
    Published: August 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.679
    JOURNAL FREE ACCESS
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    To examine the effect of antioxidant on rubbers, we investigated the effect by means of the method of continuous stress relaxation, adding the amine type antioxidants to BR and IR, with the following result :
    (1) As far as BR, which is very crosslinkable, is concerned, it was not possible to determine the relative effects of antioxidants.
    (2) Concerning IR, the relaxation of rubber added with antioxidants; PBNA, DNPPD, PANA (impossible of measurement) was something abnormal. In the evaluation of that factor by other methods, we came to think that the volatility of antioxidant itself and its reactivity were involved in it, and that DNPPD was inferior in solubility to the rubber and it generated the physical relaxtion.
    (3) In comparison with the result of Geeyer type heat aging test, that of this method does not always agree with the former. This difference is probably caused by the difference in the estimation of the effects of antioxidation.
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  • ORIENTATION AND IR OF HARD CLAY IN RUBBER
    STUDIES ON CHARACTERIZAIONS OF HARD CLAY III
    H. Kawasaki, K. Itadani, H. Hata, J. Kishi
    1971 Volume 44 Issue 8 Pages 686-691
    Published: August 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.686
    JOURNAL FREE ACCESS
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    The orientation of hard clay in SBR was studied by X-ray diffraction. In both unvulcanised and vulcanised rubber, diffraction peaks of planes (00l) of hard clay were stronger than those of hard clay alone measured in the usual way. Moreover the diffraction peaks of other planes were hardly observed. It has been concluded from the results that planes (00l) of hard clay were orientated parallel to direction of flow of the rubber. According to investigation of infrared spectra of hard clay with orientation, the band near 3700 cm-1 veries depending upon the degree of orientation.
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  • LINEAR VISCOELASTIC MEASUREMENTS OF FRACTIONATED NEOPRENE WRT
    T. Hashimoto, N. Kawasaki, K. Furuta
    1971 Volume 44 Issue 8 Pages 692-697
    Published: August 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.692
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    Relaxation spectra of fractionated Neoprene WRT samples were obtained over a wide time range by measuring the dynamic loss modulus for the transition zone and the shear modulus relaxation for the terminal zone, and the effects of molecular weight and molecular weight distribution on the linear viscoelastic properties were investigated.
    The shift factors for all samples are found to be applicable to the WLF equation with Tg = -50°C. It is found that the steady-flow viscosity η calculated from the stress relaxation master curve is proportional to M4w independently of molecular weight distribution, and that the critical molecular weight Mcr for entanglement is about 32, 000 according to the method of Ferry et al. using the relaxation spectra of fractionated samples.
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  • Erratum to : STUDIES ON PROPERTY CHANGES OF TIRE CORDS INDUCED BY HEAT TREATMENTS
    1971 Volume 44 Issue 8 Pages 697
    Published: 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.8_697
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  • [title in Japanese]
    1971 Volume 44 Issue 8 Pages 698-699
    Published: August 15, 1971
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.44.698
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  • Erratum
    1971 Volume 44 Issue 8 Pages 699
    Published: 1971
    Released on J-STAGE: May 07, 2010
    DOIhttps://doi.org/10.2324/gomu.44.8_699
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