NIPPON GOMU KYOKAISHI
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Volume 92, Issue 8
Displaying 1-5 of 5 articles from this issue
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General Reviews
  • Biobased Contents for Rubber and Rubber Products by Accelerator Mass Spectrometry (AMS)
    Mari NAKAJIMA, Akira SAITO, Masao KUNIOKA, Shunji ARAKI
    2019 Volume 92 Issue 8 Pages 287-294
    Published: 2019
    Released on J-STAGE: September 27, 2019
    DOIhttps://doi.org/10.2324/gomu.92.287
    JOURNAL FREE ACCESS
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    The biobased carbon contents of rubber and rubber products were determined by the measurements of 14C concentration with an Accelerator mass spectrometer (AMS). The biobased mass contents were calculated from the measured values of AMS and the composition ratio, which was obtained by separation analysis for each component of solvent extract, rubbers and carbon black which included inorganic fillers. Eleven model vulcanized rubbers were prepared and tested to confirm the validity of the test method. The results highly correlated with the calculated value from the formulation. High repeatability and reproducibility have been obtained from the Round-robin test in nine laboratories in four countries. Optimization studies of AMS measurement conditions for rubber compounds and determination of the correction factor for biobased carbon contents from the value of percent modern carbon for the test result were also studied.

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Advanced Course on Rubber Science and Technology
  • Heterogeneous Structure in Elastomers and Polymer Nanotechnology :
    Part IV. Polymer Nanotechnology and Megatechnology
    Toshio NISHI
    2019 Volume 92 Issue 8 Pages 295-301
    Published: 2019
    Released on J-STAGE: September 27, 2019
    DOIhttps://doi.org/10.2324/gomu.92.295
    JOURNAL FREE ACCESS
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    Some of the application of polymer nanotechnology to solve megatechnology problems like reduction of CO2 generation by developing super fuel efficient tire materials and protection of buildings & bridges from big earthquakes by elastomeric seismic-protection isolators (ESPI) are presented with examples.

    1) Development of polymer nanotechnology to analyze structure and properties of real elastomer materials with nano-fillers and polymer blends. They include transmission electron micro-tomography (TEMT) with electron energy loss spectroscopy (EELS) and nanomechanical mapping. By these nanotechnology, we can analyze structure and properties of real elastomer materials in nanoscale in detail.

    2) Application of these nanotechnologies to develop super fuel efficient tire materials to reduce 44% rolling resistance and increase 26% wear resistance.

    3) Current status of ESPI and application of these nanotechnology to develop high damping rubber bearing (HDR) are summarized. At the same time some example of the durability of ESPI for real bridge&building application are presented by replacing used ESPI from real bridge and building.

    4) In the last, international investigation of shear displacement capacity of various ESPI for buildings is presented and the need for new international standard for ESPI is emphasized.

    5)Importance of international standardization of ESPI is presented for this kind of megatechnology.

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  • Composite Mechanics of Tire
    Yukio NAKAJIMA
    2019 Volume 92 Issue 8 Pages 302-308
    Published: 2019
    Released on J-STAGE: September 27, 2019
    DOIhttps://doi.org/10.2324/gomu.92.302
    JOURNAL FREE ACCESS
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    There are three theories in the composite mechanics of fiber reinforced rubber used in tires; Classical Lamination Theory (CLT), Modified Lamination Theory (MLT) and Discrete Lamination Theory (DLT). Furthermore, the finite element method has been used in the tire design for belt and bead constructions. Those theories are reviewed and their applications for tires and rubber products are summarized.

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Introduction to Rubber Science and Technology
Technical Note
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