NIPPON GOMU KYOKAISHI
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Volume 53, Issue 4
Displaying 1-6 of 6 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 53 Issue 4 Pages 193-200
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.193
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 53 Issue 4 Pages 201-207
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.201
    JOURNAL FREE ACCESS
    Download PDF (533K)
  • [title in Japanese]
    [in Japanese]
    1980 Volume 53 Issue 4 Pages 208-215
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.208
    JOURNAL FREE ACCESS
    Download PDF (602K)
  • STUDY ON CHAR BLACK RECOVERED FROM SCRAP TIRES BY PYROLYSIS (III)
    Physical Properties of Char Recovered From Scrap Tires by Pyrolysis
    Kunihiko FUJIMOTO, Toshio NISHI, Shigeru KIJIMA, Takeshi OKAMOTO
    1980 Volume 53 Issue 4 Pages 230-243
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.230
    JOURNAL FREE ACCESS
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    The surface of char black recovered from scrap tires by pyrolysis is made of glassy resious material from elastomers and the carbon black particles therein are agglomerated with each other. When the char black is mixed with rubbers, the interaction of char black with rubber molecules and the degree of dispersion of char black within the mixture are influenced by the structure of the char black. Vulcanizates filled with char black show low degree of reinforcement, low fracture characteristics, and retain elastic properties up to high filler concentration.
    The properties of recovered char black may be characterized by three basic properties, namely the chemical and physical properties of Cα-phase formed at the surface of the char and the nature of the agglomeration of the char black. These characteristics are affected by the condition of the pyrolysis. Therefore, it is necessary to study these properties by various methods in order to utilize the recovered char black effectively. The most important problem is to develop a new evaluation technique for the recycled material besides the existing methods for simple materials since the recycled material forms a complex multicomponent system.
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  • VULCANIZATION OF ISOPRENE RUBBER ACCELERATED WITH 6-DIBU-TYLAMINO-1, 3, 5-TRIAZINE-2, 4-BIS (BENZOTHIAZOLYL DISULFIDE)
    Yoshiro NAKAMURA, Minoru SAITO, Kunio MORI
    1980 Volume 53 Issue 4 Pages 244-248
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.244
    JOURNAL FREE ACCESS
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    6-dibutylamino-1, 3, 5-triazine-2, 4-bis (benzothiazolyl disulfide) (BT) was found to accelerate vulcanization of isoprene rubber at 135-170°C to give an improved vulcanizate with an ageing resistant and a reversion resistant property. Longer induction period and lower vulcanizing rate were observed in BT-accelerated vulcanization comparing with dibenzothiazyl disulfide (MBTS)-accelerated vulcanization. Similar accelerating property and ageing resistant property of the vulcanizate were observed on a combinated accelerating system of MBTS and 6-dibutylamino-1, 3, 5-triazine-2, 4-dithiol (DB), as BT was formed quantitatively with 1 mol of DB and 2 mols of MBTS. An ageing and a reversion resistant property of the vulcanizate with BT- or MBTS• DB-accelerator were supposed to be caused by the formation of dithiotriazine crosslink. Then, addition of DB with formed dithiotriazine crosslink, was found to be effective to prevent a reversion in the vulcanization with the conventional accelerator such as N-cyclohexyl-2-benzothiazol sulfenamide, N-oxydiethylene-2-benzothiazol sulfenamide or MBTS.
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 53 Issue 4 Pages 249-250
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.249
    JOURNAL RESTRICTED ACCESS
    Download PDF (259K)
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