NIPPON GOMU KYOKAISHI
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Volume 73, Issue 12
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    2000 Volume 73 Issue 12 Pages 621-626
    Published: 2000
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.73.621
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], Aik Hwee Eng
    2000 Volume 73 Issue 12 Pages 627-633
    Published: 2000
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.73.627
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    2000 Volume 73 Issue 12 Pages 634-640
    Published: 2000
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.73.634
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    2000 Volume 73 Issue 12 Pages 641-646
    Published: 2000
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.73.641
    JOURNAL FREE ACCESS
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  • Continuous Devulcanization by Shear Flow Stage Reaction Control Technology for Rubber Recycling, Part 9.
    Devulcanization and Chemical Modification with Maleic Anhydride of Sulfur Cured Rubber by Shear Flow Stage Reactor
    Hirotaka Okamoto, Norio Sato, Makoto Mouri, Mitsumasa Matsushita, Kenz ...
    2000 Volume 73 Issue 12 Pages 647-652
    Published: 2000
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.73.647
    JOURNAL FREE ACCESS
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    Continuous devulcanization technology by the shear flow stage reactor for sulfur cured rubber has been developed. As an application of this technology, chemical modification with maleic anhydride (MAH) of sulfur cured EPDM and IIR has been performed in the devulcanizing process. MAH was able to be grafted onto both kinds of rubber. The degree of grafting of MAH was 0.05 to 0.06wt% for EPDM, 0.06 to 0.09wt% for IIR, respectively. These values correspond to 1/2 to 1/10 for some commercial acidic modified EPR or EPDM. As sol fraction and the degree of swelling, the MAH grafted devulcanized rubber (EPDM-g-MAH, IIR-g-MAH) was comparable to those of the unmodified rubber. The resulting EPDM-g-MAH has been used to binary nylon-6/EPDM-g-MAH blend by melt mixing. The EPDM-g-MAH dispersed micrometer order in the blend.
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  • The Effect of Mixing Method on the Strain Energy Density Function of Carbon Black Reinforced Rubber
    Yoshihiro YAMASHITA, Sueo KAWABATA
    2000 Volume 73 Issue 12 Pages 653-659
    Published: 2000
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.73.653
    JOURNAL FREE ACCESS
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    For the reinforcement system of rubber, Kawabata et al proposed a model with a super-network structure. Their model consists of carbon-black aggregate connected by extended chain molecules. They hypothesized that this super-network structure may be formed during rubber mixing processes that induce strong shear deformation. For reinforced rubber systems, the effect of reinforcement on the strain energy function can be represented by a third term called the γ function. This paper investigates the effect of various mixing methods on this γ function. Particular attention is given to solution mixing, which involves minimal shear forces, and would be expected by the above hypothesis to impart only a small reinforcement effect. However, the results show that solution mixing also has a strong reinforcement effect.
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  • Study on the Formation of Bound Rubber and Reinforcing Behavior of Silica Prepared by Sol-Gel Process in the Latex
    Kazumasa YOSHIKAI, Azusa SUEYOSHI, Tetsuro OHSAKI
    2000 Volume 73 Issue 12 Pages 660-667
    Published: 2000
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.73.660
    JOURNAL FREE ACCESS
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    Silica particles were prepared in the SBR latex by sol-gel method under various reaction conditions. The relationship between the reinforcing behavior of silica and the formation of bound rubber structure in composites was investigated. Measurements of the fraction of bound rubber in composites suggested that bound rubber in composites, which had high tensile strength, were largely increased during the compounding of vulcanization reagents. On the other hand, bound rubber in composites, which had low tensile strength, were slightly changed during the compounding. SEM observation results for unvulcanizated composites suggested that silica particles breakdown from agromerates (1-10μm) to aggregates (10-1000nm) during the compounding of vulcanization reagents. It was also suggested that extreme size change of silica particles was occurred in case of bound rubber largely increased during the compounding. It was considered that reinforcing behavior and particle size of silica were closely related to increasing of bound rubber during the compounding.
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  • [title in Japanese]
    [in Japanese]
    2000 Volume 73 Issue 12 Pages 668-669
    Published: 2000
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.73.668
    JOURNAL RESTRICTED ACCESS
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