NIPPON GOMU KYOKAISHI
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Volume 70, Issue 3
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1997 Volume 70 Issue 3 Pages 115-122
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.115
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1997 Volume 70 Issue 3 Pages 123-132
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.123
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1997 Volume 70 Issue 3 Pages 133-139
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.133
    JOURNAL FREE ACCESS
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  • STUDY ON THE FRICTION PROPERTY OF STUDLESS-TIRES ON ICY ROAD
    COMPARISON OF THE FRICTION PROPERTY BETWEEN STUDLESS- TIRES AND LABORATORY PREPARED SAMPLES
    Kenhachi MITSUHASHI, Eizou HIROKI, Shingo MIDORIKAWA, Shigeru SHINODA
    1997 Volume 70 Issue 3 Pages 140-146
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.140
    JOURNAL FREE ACCESS
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    In order to evaluate the friction property of studless tires on icy road, we have developed an indoor friction tester, using rubber sample, equipped with an inside drum. Comparing the results obtained by this method and those obtained by the test using studless tires with an indoor tire friction tester equipped with an inside drum which was already reported, we have studied the mechanism of rubber friction and obtained the following results.
    (1) Results obtained using rubber samples, which show friction property of only rubber, correlate well with those obtaind using block pattern tires without sipe. It was confirmed through this study that a tester equipped with an inside drum using rubber samples is an effective testing method.
    (2) Effect of only rubber hardness is analyzed as property of adhesive friction by using rubber samples. Friction coefficient can be formulated as multiply adhesion volume by adhesion force using pulse NMR results.
    F∝Ko•VL•(VL×1/T2L)
    μ=F/W
    (3) Effect of load on friction coefficient can be formulated as follows:
    μ=a•(W/S)+b
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  • COMPARISON BETWEEN SILICA AND CARBON BLACK IN TIRE TREAD FORMULATION
    Naokazu KOBAYASHI, Isao FURUTA
    1997 Volume 70 Issue 3 Pages 147-154
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.147
    JOURNAL FREE ACCESS
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    We investigated at first whether laboratory indices for roiling resistance (RR) and wet skid resistance (WS) properties of styrene-butadiene rubber (SBR)/cabon black (CB) vulcanizate were also applicable to those of a SBR/silica vulcanizate, by comparing various physical properties of both vulcanizates. Temperature dependence of the shift factor (log aT), the values of tanδ at 0°C, 15Hz and the values of friction factor of the SBR/silica vulcanizate were almost same as those of the SBR/CB vulcanizate. Therefore, we determined to apply indices for RR and WS properties of SBR/CB vulcanizate as the labo-scale measures for the performance of the SBR/silica vulcanizate.
    Second, we studied the effects of microstructures and modifications of SBRs on these indices and a Lambourn abrasion property of the SBR/silica vulcanizates.
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  • DEVELOPMENT OF POLYURETHANE/CHITIN COMPOSITES
    Kyoko HIRAOKA, Tetsuo YOKOYAMA
    1997 Volume 70 Issue 3 Pages 155-162
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.155
    JOURNAL FREE ACCESS
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    A novel functional composite by combining chitin and polyurethane elastomers was developed. Diisocyanates were reacted with polymer glycols at 80°C in a nitrogen atmosphere to form NCO-terminated prepolymers. Various amounts of chitin powder were added to a prepolymer with catalyst and mixed thoroughly. Then the reaction mixtures were molded by a press at 70-90°C for 1-7hr. After synthetic conditions were examined, it was found that the proper range of the amount of chitin, the optimum time, temperature, and pressure required for pressure-molding were 60wt%, 4hr, 90°C, and 30MPa, respectively. After screening several polymer glycols and diisocyanates, poly(oxytetramethylene) glycol and hexamethylene diisocyanate were found to be suitable for compatibility with chitin. Swelling, thermal property, tensile property, SEM, and water sorption of polyurethane/chitin composites were measured. The composites were brittle, but the wet composites became elastomeric. The composites had good humid-breathing function.
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  • [title in Japanese]
    [in Japanese]
    1997 Volume 70 Issue 3 Pages 164-165
    Published: 1997
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.70.164
    JOURNAL RESTRICTED ACCESS
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