NIPPON GOMU KYOKAISHI
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Volume 53, Issue 8
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 53 Issue 8 Pages 457-468
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.457
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 53 Issue 8 Pages 469-478
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.469
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 53 Issue 8 Pages 479-485
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.479
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 53 Issue 8 Pages 486-489
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.486
    JOURNAL FREE ACCESS
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  • CHEMICAL RECLAMATION OF USED TIRES (I)
    ANALYSIS OF FACTORS AFFECTING PHYSICAL PROPERTIES OF RECLAIMED RUBBER AND CHARACTERISTICS OF USED TIRES VULCANIZATES
    Junji FURUKAWA, Hiroshi OKAMOTO, Shinji INAGAKI, Yukio ONOUCHI, Shiro ...
    1980 Volume 53 Issue 8 Pages 490-496
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.490
    JOURNAL FREE ACCESS
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    The tensile properties and network structures of commonly supplied used tires were evaluated in order to establish a convenient reclaiming method for waste tire scraps. The average tensile strength and the elongation at break were found to be 137kgf/cm2 and 350%, respectively. The average content of disulfide linkage was 30% for total cross-linking.
    The plasticity affecting its processibility of reclaimed rubber was appreciably related to the sol content which could be evaluated by a simple solvent extraction method for unvulcanized reclaimed sample. It was also found that the amounts of the scission of networks and the molecular weight of sol component in the mechano-chemically treated scrap rubbers affected sharply their tensile properties.
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  • CHEMICAL RECLAMATION OF USED TIRES (II)
    MECHANO-CHEMICAL RECLAMATION OF USED TIRES WITH MIXING MILL (I) SEARCH FOR EFFECTIVE RECLAIMING AGENTS
    Junji FURUKAWA, Hiroshi OKAMOTO, Shinji INAGAKI, Yukio ONOUCHI, Shiro ...
    1980 Volume 53 Issue 8 Pages 497-505
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.497
    JOURNAL FREE ACCESS
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    A search for effective reclaiming agents was carried out by means of a mechano-chemical reclaiming method for the purpose of crosslink scission of vulcanizates. Triphenyl phosphine, the combinations of p-toluene sulfinic acid with 1, 8-diaza-bicyclo (5, 4, 0) undecne-7 (DBU) or its salts and tetraethylthiuram disulfide with DBU were found to be more effective reclaiming agents. The reclaimed rubbers obtained by means of this method were observed to be hardened after left standing. However, they could easily be softened by remilling several times.
    These revulcanizates maintained the values of their tensile strength and elongation at break within 48-67% and 35-48%, respectively. Among others, the revulcanizates having good tensile properties could be obtained by use of reclaiming agents that acted mainly as crosslinking breaker.
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  • STUDIES ON STRUCTURE AND PHYSICAL PROPERTIES OF VULCANIZATES CONTAINING COMMINUTED VULCANIZATES
    (I) DISCONTINUITY OF FREE VOLUME DUE TO DIFFUSION OF SULFUR NEAR THE INTERFACE BETWEEN COMMINUTED AND MATRIX RUBBER
    Kunihiko FUJIMOTO, Toshio NISHI, Takeshi OKAMOTO
    1980 Volume 53 Issue 8 Pages 506-514
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.506
    JOURNAL FREE ACCESS
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    Physical properties of vulcanizates containing comminuted vulcanizates show linear and nonlinear dependence on the volume fraction of comminuted vulcanizates. One of the reasons for the linear dependence has been assumed to be due to discontinuity of free volume distribution at the interface caused by transport of sulfur from the matrix to the comminuted vulcanizates through diffusion and chemical reaction.
    The transport phenomena of sulfur have been studied by X-ray microprobe analysis (XMA) and freezing point depression of solvent for a model specimen with layered vulcanized rubber and unvulcanized rubber filled with curatives. The results show evidence of the transport of sulfur from the unvulcanized rubber to the vulcanized rubber after curing and a corresponding high crosslink density in the vulcanized rubber or comminuted vulcanizates. There is a sharp discontinuity in the crosslink density or free volume near the interface between unvulcanized and vulcanized rubber after curing.
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 53 Issue 8 Pages 515-516
    Published: 1980
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.53.515
    JOURNAL RESTRICTED ACCESS
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