NIPPON GOMU KYOKAISHI
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Volume 88, Issue 1
Displaying 1-5 of 5 articles from this issue
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Advanced Course on Rubber Science and Technology
  • Structure and Property Relationship in Nano-filler Loaded Cross-linked Rubbers
    5. Filler Networks and Viscoelastic Properties of Filler Loaded Cross-linked Natural Rubber: New Proposal for Carbon Black/Natural Rubber Interaction
    Atsushi KATO, Yuko IKEDA, Shinzo KOHJIYA
    2015 Volume 88 Issue 1 Pages 3-10
    Published: 2015
    Released on J-STAGE: May 22, 2015
    DOIhttps://doi.org/10.2324/gomu.88.3
    JOURNAL FREE ACCESS
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    Effect of the kind of nano-fillers on dynamic mechanical properties and morphology of the filler loaded crosslinked natural rubber (NR) is reviewed, where carbon black (CB), hydrophobic silica and hydrophilic silica are compared. 3D-TEM/electron tomography is utilized to measure a closest distance (dp) between centers of two neighboring nano-filler aggregates. Activation energies (ΔEJ' and ΔEJ") are calculated from temperature dependences of storage compliance (J') and loss compliance (J") of the filler loaded cross-linked NRs and are discussed with the dp values. An interaction layer between the nano-fillers and NR is suggested to be additionally composed of at least two layers with different viscoelastic energy levels. For the samples with CB loadings of 30 parts per one hundred rubber by weight or more, the CB/NR interaction layer (CNIL) is visualized by 3D-TEM, and the CNIL is proposed to be an origin of reinforcement effect using the parallel mechanical model.
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  • Fracture Reveals Real Structure and Characters of Rubber
    Part 3: Degradation of Rubber Occupied by the Intensity of Radiation Energy Imposed from Environment
    Yoshihide FUKAHORI
    2015 Volume 88 Issue 1 Pages 11-17
    Published: 2015
    Released on J-STAGE: May 22, 2015
    DOIhttps://doi.org/10.2324/gomu.88.11
    JOURNAL FREE ACCESS
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    Environmental degradation of rubber is distinguished from each other based on the intensity of the imposed radiation energy. Oxide only changes properties of rubber without influencing its fracture and life. Ozone and ultra-violet of high energy radiation induce directly the initiation and propagation of crack and thus occupy a fatigue life of rubber. These sensitive characteristics of rubber for degradation seem to depend not only on its chemical structure but its inhomogeneous polymer network formed in vulcanizing process.
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Report
  • On the Renewed Possibility of Natural Rubber Yielding Plants (Part I)
    Shinzo KOHJIYA
    2015 Volume 88 Issue 1 Pages 18-24
    Published: 2015
    Released on J-STAGE: May 22, 2015
    DOIhttps://doi.org/10.2324/gomu.88.18
    JOURNAL FREE ACCESS
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    It has been known that lots of plants are rubber yielding besides Hevea brasiliensis. However, only Hevea brasiliensis has been actively cultivated to produce rubber. Recently, studies on rubber yielding plants have been resumed by some reasons; biodiversity, biosecurity and the increasing demand for natural rubber, to name a few. This recent trend is reviewed and discussed from the sustainablity viewpoint in this report. In the first part, biodiversity is developed in relation with sustainable development thesis, and general features of rubber yielding plants are described with their historical backgrounds.
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Activity Report
Technical Note
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