NIPPON GOMU KYOKAISHI
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Volume 59, Issue 10
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1986 Volume 59 Issue 10 Pages 545-551
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.545
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1986 Volume 59 Issue 10 Pages 552-554
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.552
    JOURNAL FREE ACCESS
    Download PDF (447K)
  • [title in Japanese]
    [in Japanese], [in Japanese]
    1986 Volume 59 Issue 10 Pages 555-564
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.555
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1986 Volume 59 Issue 10 Pages 565-567
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.565
    JOURNAL FREE ACCESS
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  • STUDIES ON THE MOLECULAR STRUCTURE OF THE CROSSLINKING POINTS OF EPDM
    Taiji MIYAKE, Shuuji MORIUCHI, Yoshihiro MASUDA, Fumikazu YAMAGATA
    1986 Volume 59 Issue 10 Pages 568-573
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.568
    JOURNAL FREE ACCESS
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    The mechanism for crosslinking of various EPDM rubbers has not yet been clearly established, though the mechanism is assumed to be based on the recombination of two polymer radicals produced by the extraction of hydrogen from activated methylene, methyne or methyl groups neibouring the olefinic double bond in EPDM molecules. This study was intended to elucidate the crosslinking mechanism of three tyeps of EPDM, i. e., dicyclopentadiene, ethylidene norbornene, and 1, 4-hexadiene types by using an electron spin resonance spectrometer. The experimental procedure was based on the so-called spin trapping method by using 2, 4, 6-tri-tertbutylnitrosobenzene as a radical trapping agent and benzoyl peroxide as a radical initiator for EPDM in n-heptane solution to afford the molecular structure of polymer radicals. This study enables us to elucidate the moleculer structure of the crosslinking point. The difference hed seen the cure rates of the three types of EPDM was referred from the results.
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  • STUDY ON FATIGUE OF PARTICULE REINFORCED RUBBER VULCANIZATES WITH THREE-DIMENSIONAL STRESSES (1)
    Study on Structual Changes Caused by Fatigue Due to Three-Dimensional Stresses
    Kunihiko FUJIMOTO, Naoto MIFUNE, Haruhisa KOFUJI, Tadahiro UEKI
    1986 Volume 59 Issue 10 Pages 574-583
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.574
    JOURNAL FREE ACCESS
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    We investigated structual changes in rubber molecular chain phases and in carbon black aggregated phases in carbon black filled NR vulcanizates, casued by fatigue due to three-dimensional stresses developed by round projections, by measuring the mobility of rubber molecule, amount of weak physical bonds, thermodynamic properties of modulus and dispersed structure of carbon black particules. We inferred that the rubber molecular chain phases of high mobility (A phase) and rubber molecular chain phases of low mobility (C phase) come to form different thermodynamic structures, thereby producing a heterogeneous structure of the system. And carbon black aggregates structures are oriented in the direction of principal tensile stress, forming layers of about 0.5μm at regular intervals in the direction of principal compression stresses. Meanwhile, structures of rubber molecules within a layer are oriented in the direction of a layer and rubber molecules between layers come to form random structures of increased free volume.
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  • STUDY ON FATIGUE OF PARTICULE REINFORCED RUBBER VULCANIZATES WITH THREE-DIMENSIONAL STRESSES (2)
    Study on Temperature Dependences of Dynamic Properties of Rubber Vulcanizates Fatigued with Three-Dimensional Stresses
    Kunihiko FUJIMOTO, Naoto MIFUNE
    1986 Volume 59 Issue 10 Pages 584-589
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.584
    JOURNAL FREE ACCESS
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    In the previous paper, it was inferred that rubber molecular chain phases and carbon black aggregated phases form the anisotropic layer structure on account of fatigue due to three-dimensional stresses. Along the direction of tensile stresses, rubber molecular chain phases within the layer are oriented and in consequence they acquire low mobilities, whereas along the direction of compression stresses, rubber molecular chain phases between layers form random structures and they acquire high mobilities.
    In this paper is investigated in detail the influence of the anisotropic layer structure on the mobilities of rubber molecular chains by measuring the dependence of the dynamic properties on temperature. Temperatures, exhibiting maxmal tan δ, shift to high temperature side along the parallel direction of layer and to low temperature side along the perpendicular direction of layer. Thus it is seen that rubber molecular chain phases have low mobilities and high mobilities along different directions.
    Consequently, it is confirmed that the rubber molecular chain phases form oriented structures within a single layer and random structures between different layers.
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  • [title in Japanese]
    [in Japanese]
    1986 Volume 59 Issue 10 Pages 590-591
    Published: 1986
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.59.590
    JOURNAL RESTRICTED ACCESS
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