NIPPON GOMU KYOKAISHI
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Volume 84, Issue 4
Displaying 1-4 of 4 articles from this issue
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Regular Papers
  • Polymer Modification Exploiting Stable Nitrile N-Oxide
    Yasuhito KOYAMA, Akishige SEO, Toshikazu TAKATA
    2011 Volume 84 Issue 4 Pages 111-116
    Published: 2011
    Released on J-STAGE: March 27, 2012
    DOIhttps://doi.org/10.2324/gomu.84.111
    JOURNAL FREE ACCESS
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    This paper describes the powerful practical modification method of elastomers with unsaturated bonds exploiting kinetically stabilized nitrile N-oxides. The stable nitrile N-oxides enable the efficient 1,3-dipolar cycloaddition to both internal olefin and nitrile groups incorporating into versatile elastomers such as acrylonitrile butadiene rubber (NBR), natural rubber (NR), and ethylene-propylene-diene terpolymer (EPDM) to give the corresponding hetero aromatics-containing polymers. The reaction features i) catalyst-free procedure, ii) versatile applicability to various elastomers, iii) high yield, iv) high regio-selectivity, v) no by-product, and vi) remarkable acceleration of reaction rate under solvent-free condition. The scope and limitation of the modification reaction are discussed in detail.
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  • Analysis of Contact States between Rubber and Mated Surface Using X-ray Imaging Method
    –Studies on Contact States of Rubber Sliding on Spherical Hard Solids–
    Naoya AMINO, Yasuhiro ISHIKAWA, Masakazu TAKEUCHI
    2011 Volume 84 Issue 4 Pages 117-123
    Published: 2011
    Released on J-STAGE: March 27, 2012
    DOIhttps://doi.org/10.2324/gomu.84.117
    JOURNAL FREE ACCESS
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    Frictional experiments of rubber against spherical hard solids were carried out. The contact states between the rubber specimens and the spherical solids were observed by using X-ray imaging method in SPring-8; Beam line 19B2; X-ray energy = 25 keV; Pixcel size of X-ray images = 10 μm. The real time observation by using the brilliant X-ray of the synchrotron was applied to characterize the contact states of opaque rubbers during friction. Under the following conditions, diameter of glass sphere as the mated surface = 3 mm and transverse velocity of the mated surface = 0.3 mm/s, the contacting geometry and frictional force were measured simultaneously, and then relationship between the contact state and the frictional force was investigated. The frictional force shows a correlation with the contact area or the shear stress of the rubber. Consequently, it was summarized that the real time observation during friction using X-ray imaging is very effective to understand the mechanism of rubber friction. The synchrotron radiation experiments were performed at BL19B2 in the SPring-8 with approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2005B0877).
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Advanced Course on Rubber Science and Technology
Technical Note
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