NIPPON GOMU KYOKAISHI
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Volume 57, Issue 3
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1984 Volume 57 Issue 3 Pages 137-140
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.137
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1984 Volume 57 Issue 3 Pages 141-148
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.141
    JOURNAL FREE ACCESS
    Download PDF (591K)
  • [title in Japanese]
    [in Japanese]
    1984 Volume 57 Issue 3 Pages 149-162
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.149
    JOURNAL FREE ACCESS
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  • ADHESIVES BASED BLOCK COPOLYMER (IV)
    MODIFICATION OF STYRENE-BUTADIENE BLOCK COPOLYMER BY VINYL COMPOUNDS HAVING EPOXY GROUP
    Jojiro OKUMURA, Koichi YAMAGUCHI, Tadashi YOKOYAMA
    1984 Volume 57 Issue 3 Pages 163-170
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.163
    JOURNAL FREE ACCESS
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    The modification of styrene-butadiene block copolymer (SBS) was carried out by the graft polymerization of vinyl compounds having an epoxy group in order to improve the heat resistance. It was found that SBS graft modified by glycidyl methacrylate (GMA) crosslinked with various hardeners of epoxy resin, and the heat resistance was improved by this crosslink. This modified SBS was confirmed to be effectual adhesives for the bond of plasticized poly(vinyl chloride), but the peel strength was less than that of SBS graft modified by methyl methacrylate (MMA). The peel strength and the heat resistance were much improved by two-step graft polymerization of MMA and GMA. Furthermore, allyl glycidyl ether was also effected by the combined use of MMA.
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  • SHORT FIBER-ELASTOMER COMPOSITES (2)
    THE EFFECT OF FIBERS ON THE MECHANICAL PROPERTIES OF SHORT FIBER-CR COMPOSITES
    Toru NOGUCHI, Michio ASHIDA, Satoshi MASHIMO
    1984 Volume 57 Issue 3 Pages 171-177
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.171
    JOURNAL FREE ACCESS
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    The mechanical properties and swelling anisotropy of short fiber-CR composites were examined using various fibers; Vinylon, Conex, rayon, cotton and carbon fiber. Those properties were affected by dispersion and orientation of fibers and adhesion between fibers and matrix.
    Although Vinylon and Conex fibers held their original length after mixing, both rayon and cotton fibers were broken to about a quarter of the original length and carbon fibers to pieces of 150μm in length during mixing. The stress-strain curves of composites with non-treated fibers except Conex showed that the tensile stress increased linearly to the yield point at 5-20% extension with increasing strain. In the case of the composites with RFL-treated fibers, the tensile stress increased sharply as the strain increased and then the composites were fractured without yield. For cotton fibers RFL-treatment did not work as the reinforcement of the composites. Swelling of the composites took the minimum value in the longitudinal direction of fibers and the maximum value in the transverse direction. The young's modulus of the composites depended on the kind of fibers and the composites with Vinylon, Conex, and rayon had high moduli. The tensile stress and young's modulus of carbon fiber-CR composites were the lowest value among the short fiber-CR composites.
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  • PARTICLE DISPERSION BY A LATTICE MODEL AND ELECTRICAL RESISTIVITY OF A COMPOSITE
    Ryo Oono
    1984 Volume 57 Issue 3 Pages 178-182
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.178
    JOURNAL FREE ACCESS
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    A rubber filled with electrically conducting particles changes abruptly from a insulator to a conductor at a certain value of particle concentration. We analized theoretically this phenomenon on the assumption that conducting particles disperse randomly on the lattice points of a simple cubic lattice. When the ratio of the lattice points occupied by particles reaches to 0.2, the conducting chain of connected particles appears first. At this point the volume fraction of filled particles is about 0.1. If we regard this particle chain as a electrically conducting wire, calculated results explain well the experimental data.
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  • [title in Japanese]
    1984 Volume 57 Issue 3 Pages 198-199
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.198
    JOURNAL RESTRICTED ACCESS
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