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Volume 87, Issue 7
Displaying 1-8 of 8 articles from this issue
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Regular Papers
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–Real Time Observations of Rubber Breakage during Friction–Naoya AMINO, Yasuhiro ISHIKAWA, Masaki SATO2014 Volume 87 Issue 7 Pages 278-283
Published: 2014
Released on J-STAGE: January 24, 2015
JOURNAL FREE ACCESSBreakage of rubber rubbed against abrasive cloth was observed by a real time X-ray imaging method to clarify mechanisms of wear initiation.
The synchrotron radiation experiments were performed at the BL20XU in the SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2006B0109). X-ray energy was 15 keV. C4742-98-24A camera was used. Silica- or carbon black- filled SBRs were rubbed against #24 zirconium cloth. A crack at the rubber surface was observed when the rubber was rubbed against a sharp grain. The crack was generated perpendicular to the rubber surface at the middle between the bottom line of the rubber specimen and the top of the sharp grain. No cracks were observed when the rubber was rubbed against blunt grains in this experiment. The frictional force was maximized when the crack was generated.
It is thought that the crack of the rubber surface during friction was generated by an excess of rubber strain when the rubber hanged on the sharp grain.View full abstractDownload PDF (959K)
General Reviews
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Shigemitsu OTOMO2014 Volume 87 Issue 7 Pages 284-291
Published: 2014
Released on J-STAGE: January 24, 2015
JOURNAL FREE ACCESSTire and automobile parts such as fuel hose, rubber packing and timing belts etc. are made of rubber vulcanizate, the improvement of their ozone resistance by addition of antidegradant is very important theme.
This paper reviews the ozone protection activity of antidegradants evaluated by their reactivity for ozone, the influence of volatility by heating or the extraction by water (rainfall) on the ozone protection activity of antidegradant, and the protection of NR, CR and NBR vulcanizates against ozone degradation by addition of antidegradant with ozone protection activity and ozone protect wax.View full abstractDownload PDF (584K) -
Shinichi KATO2014 Volume 87 Issue 7 Pages 292-298
Published: 2014
Released on J-STAGE: January 24, 2015
JOURNAL FREE ACCESSChina has No1 capacity of reclaimed rubber production in the world. Its industry has many advanced and unique technologies and its application including high performance reclaimed rubber, normal pressure continuous reclaiming process, environmental-friendly reclaimed rubber, activator of reclaimed process and 120mesh fine rubber power etc.
Global reclaimed rubber market and reclaimed rubber allocation for tire is also described.View full abstractDownload PDF (662K) -
Mikihito TAKENAKA2014 Volume 87 Issue 7 Pages 299-302
Published: 2014
Released on J-STAGE: January 24, 2015
JOURNAL FREE ACCESSNon-uniformity in cross-linked rubber is one of important factors to control mechanical properties in rubber. This review presents an analysis of the non-uniformity by using small angle neutron scattering (SANS) method. In the method, the rubber is swollen by solvent and the non-uniformity as well as the network structure can be observed by SANS. The observation of smaller wavenumber region with Focusing SANS has clarified that another non-uniformity exists in the order of 100 nm in addition to non-uniformity found previously by Ikeda et al.View full abstractDownload PDF (972K)
Advanced Course on Rubber Science and Technology
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Part 4: Is Elastomer a Living Thing?Masayoshi ITO2014 Volume 87 Issue 7 Pages 303-309
Published: 2014
Released on J-STAGE: January 24, 2015
JOURNAL FREE ACCESSStability of network structure was discussed. ESR measurements under the tensile elongation of vulcanizates gave us useful information on the changes of network structure during tensile elongation. ESR spectra showed the appearance of carbon and sulfur radicals which were produced by the breakdown of chemical linkages in the network structure. At a given mechanical energy applied to the vulcanizates, the radical concentration was dependent on the style of network structure and chemical structure of rubber molecules. The difference of binding energy in the network structure was not enough to explain the results. A stress concentration which was induced by the inhomogeneous network structure might have an important role on the partial destruction of network structure in the vulcanizates.View full abstractDownload PDF (1164K) -
(3) Solid State NMR Study of Rubbers and NanocompositesAtsushi ASANO2014 Volume 87 Issue 7 Pages 310-318
Published: 2014
Released on J-STAGE: January 24, 2015
JOURNAL FREE ACCESSIn this review, we discussed the characteristics of the high-resolution solid state NMR analysis for the rubbers and nanocomposites. The change of the molecular motion of the vulcanized styrene-butadiene rubber (SBR) affected by the magic angle spinning (MAS) were studied by the temperature dependence of the 1H spin-lattice relaxation time (T1). We investigated the orientation direction of the unvulcanized natural rubber through the static angular-dependent 13C NMR. The rubbers having the double bond in the unit showed the angular dependence of the magnetic susceptibility against the applied static magnetic field, while the rubbers without the double bond did not show such dependence. The role of the organic modifier on clay surface in the Nylon6/clay nanocomposites was analyzed by the simple 1H MAS NMR spectra.View full abstractDownload PDF (1422K)
Series of Symposium on Rubber Techniques
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Masayuki Ito2014 Volume 87 Issue 7 Pages 319-324
Published: 2014
Released on J-STAGE: January 24, 2015
JOURNAL FREE ACCESSDownload PDF (830K)
Technical Note
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2014 Volume 87 Issue 7 Pages Annc7_265
Published: 2014
Released on J-STAGE: January 24, 2015
JOURNAL RESTRICTED ACCESSDownload PDF (264K)
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