NIPPON GOMU KYOKAISHI
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Volume 40, Issue 8
Displaying 1-8 of 8 articles from this issue
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  • STUDIES ON THE DETERMINATION METHODS OF OZONE CONCENTRATION
    (PART II) OZONE DETERIORATION OF RUBBER VULCANIZATES
    Y. Takano, H. Kurumiya, T. Suzuki
    1967 Volume 40 Issue 8 Pages 615-627
    Published: August 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.615
    JOURNAL FREE ACCESS
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    Since the stress relaxation behavior of vulcanized rubber in atmosphere containing ozone was reported, we have studied the determination methods for ozone concentration. The values obtained by them were found so different from each other, and there were the merits and demerits in each method.
    Three methods which had already been standardized in ASTM D 1149 : the spray jet method the modified spray jet method, and the counter current method, were investigated and compared with each other in this paper, and also the method applying electro-coulombmetry which was developed by A. E. Ehmert, the modified ones, and the automatic measurement recording method developed by MAST Co., Ltd. in U.S.A. were investigated.
    According to the results the ASTM methods showed higher efficiency of ozone absorption among them and the electro-coulombmetry methods did lower eficiency.
    However, there were several troubles in ASTM methods on the operation of measurement, whereas the electro-coulombmetry methods had several merits. And so we studied the electro-coulombmetry methods for ozone concentration.
    The following considerations were made on the low efficiency of ozone absorption.Theconcentration of KI in the absorption solution, the absorption with or without the phosphate buffersolution, the dependence of the endpoint of the electrolytic reaction upon the KI concentration, and the glass-filter of absorption apparatus vastly affected the determination values.
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  • OZONE CRACKING OF RUBBER VULCANIZATES
    PART III STUDIES ON THE ELECTRO-COULOMBMETRY METHOD FOR DETERMINATION OF OZONE CONCENTRATION
    Y. Takano, H. Kurumiya, Y. Tanimoto, K. Taniguchi, H. Koba
    1967 Volume 40 Issue 8 Pages 628-632
    Published: August 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.628
    JOURNAL FREE ACCESS
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    In our previous paper, we studied seven methods of measuring ozone concentration, and reported that the counter-current method (ASTM D 1149 method (c)) had the highest efficiency of ozone absorption and the electro-coulombmetry methods showed lower efficiency. Moreover we studied the causes of defects in them.
    Comparing with ASTM methods, the electro-coulombmetry methods have several advantages, especially, the quantity of collected ozonized air is very small and the analyzing process is very easy. Therefore in this paper we made some modifications in the absorption column and the composition of the absorption solution and analyzing processes.
    This modified method showed almost the same results as between 20 and 230 pphm ozone concentration.
    The advantages of this method were shown as follows :
    (1) It is not necessary to measure the factor of 1/1000N-Na2S2O3
    (2) The quantity of collected ozonized air is very small, 5 liters will be enough.
    (3) Analyzing process is easy.
    (4) The quantity of ozone in atmosphere can be easily determined.
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  • RADIATION-INDUCED DEGRADATION OF IIR VULCANIZATES
    DETERIORATION OF POLYMERS BY IONIZING RADIATION (IV)
    J. Tsurugi, K. Imamura, T. Baba, M. Irabu
    1967 Volume 40 Issue 8 Pages 633-635
    Published: August 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.633
    JOURNAL FREE ACCESS
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    HR-Sulfur vulcanizates filled with L-CaCO3 and containing various kinds of rubber chemicals, and IIR-Sulfur and Oxime vulcanizates filled with HAF black were subjected to Co-60 gamma irradiation. The same procedures as in previous papers were applied in this paper also. The following results were obtained.
    (1) IIR vulcanizates were deteriorated with irradiation from 5 × 106 to 1 × 107r and became viscous with irradiation of 5 × 107r. This makes the determination of vulcanizates properties impossible.
    (2) Little change was observed in elongation but an extreme decrease of tensile strength was observed with an increasing radiation dose, and hence IIR seemed to be a polymer of typical degrading type.
    (3) Antirads were not effective on IIR vulcanizates.
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  • ANTI-RADIATION EFFICIENCY OF THE ORGANIC RUBBER CHEMICALS IN BR AND SBR VULCANIZATES
    DETERIORATION OF POLYMERS BY IONIZING RADIATION (V)
    J. Tsurugi, K. Imamura, T. Baba, M. Irabu
    1967 Volume 40 Issue 8 Pages 636-641
    Published: August 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.636
    JOURNAL FREE ACCESS
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    BR and SBR-Sulfur vulcanizates containing various kinds of rubber chemicals, all of which were filled with HAF black, were irradiated with Co-60 gamma radiation. The same procedures as in previous papers were applied in this paper also. The following results were obtained.
    (1) An extreme increase of stress at 100% elongation was observed with irradiation of 1×107r, and hence BR seemed to be a polymer of typical crosslinking type.
    (2) Antirad improved slightly the properties of BR and SBR vulcanizates after irradiation. However, even in the presence of antirad, BR vulcanizates were deteriorated with irradiation from 5×107 to 1×108r and SBR vulcanizates were deteriorated from 1×108 to 5×108r.
    (3) Generally speaking, antirad in BR and SBR vulcanizates was more effective than one in NR vulcanizate.
    (4) Little difference in changes of 100% stress of BR and SBR vulcanizates was observed between irradiation in air and that in nitrogen.
    (5) Changes of physical properties of BR-Oxime and peroxide vulcanizates after irradiation indicated a similar tendency to those of the corresponding NR vulcanizates.
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  • [title in Japanese]
    [in Japanese]
    1967 Volume 40 Issue 8 Pages 642-647
    Published: August 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.642
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1967 Volume 40 Issue 8 Pages 648-656
    Published: August 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.648
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1967 Volume 40 Issue 8 Pages 657-666
    Published: August 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.657
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1967 Volume 40 Issue 8 Pages 700-701
    Published: August 15, 1967
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.40.700
    JOURNAL RESTRICTED ACCESS
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