NIPPON GOMU KYOKAISHI
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Volume 89, Issue 4
Displaying 1-8 of 8 articles from this issue
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Special Issue for General Reviews “Evaluation of Mixing and Processability for Rubber Compounds”
Introductory Remarks
General Reviews
  • [title in Japanese]
    [in Japanese]
    2016 Volume 89 Issue 4 Pages 90
    Published: 2016
    Released on J-STAGE: July 26, 2016
    DOIhttps://doi.org/10.2324/gomu.89.90
    JOURNAL FREE ACCESS
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  • Change in Network Structures of Filled Rubbers in Mixing and Kneading Processes
    —Discussion from the Viewpoint of Three Network Model—
    Yoshinobu ISONO
    2016 Volume 89 Issue 4 Pages 91-96
    Published: 2016
    Released on J-STAGE: July 26, 2016
    DOIhttps://doi.org/10.2324/gomu.89.91
    JOURNAL FREE ACCESS
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    Filled rubbers are mixtures of polymers having low glass transition temperatures and inorganic fillers such as carbon black. Nanoparticle-filled rubbers include hierarchical network structures i.e. entanglement, bridged filler, and contact filler networks, due to polymer-polymer, polymer-filler, and filler-filler interactions, respectively. In this article, change in hierarchical network structures of filled rubbers in mixing and kneading processes are discussed from the viewpoint of Three Network Model.
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  • The Fluidity and Processability of Rubber Compounds
    Hitoshi NISHIZAWA
    2016 Volume 89 Issue 4 Pages 97-102
    Published: 2016
    Released on J-STAGE: July 26, 2016
    DOIhttps://doi.org/10.2324/gomu.89.97
    JOURNAL FREE ACCESS
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    There are close relation between fluidity and processing of rubbers. The fluidity behaviors of rubber compounds can be explained by using the viscosity, pressure loss and stress relaxation factor as the processing index to realize the processability of rubbers in extruding and metal moulding cure processes. It can be considered that low viscosity, low pressure loss and proper stress relaxation factor should be necessary for extruding and metal moulding cure processes.
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  • Evaluation of Rubber Mixing Conditions and Molding Formability
    Jiro KOGUSURI
    2016 Volume 89 Issue 4 Pages 103-108
    Published: 2016
    Released on J-STAGE: July 26, 2016
    DOIhttps://doi.org/10.2324/gomu.89.103
    JOURNAL FREE ACCESS
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    It is well known that the conditions of rubber material mixing has an impact on the formability of molding. While mixing carbon black in the rubber, the interactions between the dispersion of carbon black into the rubber and the interface of the polymer and carbon black occur at the same time. We will discuss the relationship between the formability of molding and rubber mixing conditions with references to experimental results by authors discussing continuous extrusion.
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  • Evaluation of Rubber Mixing for Physical Properties of Vulcanized Rubber
    Yasuhiro ISHIKAWA
    2016 Volume 89 Issue 4 Pages 109-114
    Published: 2016
    Released on J-STAGE: July 26, 2016
    DOIhttps://doi.org/10.2324/gomu.89.109
    JOURNAL FREE ACCESS
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    Mixing can be used to improve processing behavior or vulcanized properties. Good dispersion of carbon black is essential for rubber compounding in order to obtain optimum vulcanized properties. The reduction in viscosity of a compound during mixing is due to mastication of elastomer and disagglomeration of the carbon black. After mixing compounds are made up of four components; aggregate, agglomerate, bound rubber and free rubber. Higher-order structure which is composed by these four components induces the stress concentration, showing lower physical properties. During mixing disagglomeration without chain scission of the elastomer gives the higher tensile properties.
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  • Influence of Filler Dispersion on Processability of Rubber
    Hiroyuki ONTSUKA
    2016 Volume 89 Issue 4 Pages 115-120
    Published: 2016
    Released on J-STAGE: July 26, 2016
    DOIhttps://doi.org/10.2324/gomu.89.115
    JOURNAL FREE ACCESS
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    Dispersion of filler such as carbon black into the rubber greatly affects the durability of the rubber products. The necessity of determination of the filler dispersion, especially, has been frequently discussed. On the other hand, in comparison with the evaluation method of the vulcanized rubber for the CB dispersion, evaluation methods of the unvulcanized rubber is very limited.
    The evaluation methods of the filler dispersibility are prescribed in standards of ISO and ASTM, but standards of JIS does not include them.　In this paper, I comment on test methods about the processability of unvulcanized rubber and describe the influence of filler dispersion on rubber processability.
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Technical Note
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