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Predecessor
Volume 72, Issue 10
Displaying 1-10 of 10 articles from this issue
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[in Japanese]1999 Volume 72 Issue 10 Pages 567-571
Published: 1999
Released on J-STAGE: July 09, 2007
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[in Japanese]1999 Volume 72 Issue 10 Pages 572-577
Published: 1999
Released on J-STAGE: July 09, 2007
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[in Japanese], [in Japanese]1999 Volume 72 Issue 10 Pages 578-585
Published: 1999
Released on J-STAGE: July 09, 2007
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[in Japanese]1999 Volume 72 Issue 10 Pages 586-592
Published: 1999
Released on J-STAGE: July 09, 2007
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[in Japanese]1999 Volume 72 Issue 10 Pages 593-598
Published: 1999
Released on J-STAGE: July 09, 2007
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Yasutaro KIUCHI, Masayoshi ITO1999 Volume 72 Issue 10 Pages 599-605
Published: 1999
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe normal carbon black or oxidized carbon black was incorporated into polyisoprene rubber by a solution blend, then the blends were treated by a toluene to get carbon gels from the composites. Transmission electron microscopy (TEM) observation and NMR measurements were carried out for the gels. It was evident from TEM observation that the rubber gels with the thickness of 2-3nm developed homogeneously on the normal carbon black. Further, the thickness increased when the oxidized carbon black was utilized. NMR results revealed that the carbon gel from normal carbon black was composed of soft and hard rubber phases. An additional phase (intermediate phase) was observed in the carbon gel from oxidized carbon black. Although the amount of carbon gel was larger for oxidized carbon black than for normal carbon black, the increase was primarily dependent on the increase of the content of intermediate and soft rubber phases. Based on these results combined with the surface characterization of carbon black, the formation mechanism and structure of bound rubber were discussed.View full abstractDownload PDF (1345K) -
Tomoaki IWAI, Yoshitaka UCHIYAMA1999 Volume 72 Issue 10 Pages 606-611
Published: 1999
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSIn this study variation in the frictional force of rubber was examined at the initial stage of pattern abrasion. The abrasion patterns′ lengths on the contact surface were also investigated to deduce the frictional force per unit length of abrasion patterns.
In the experiments, a rubber specimen was rubbed against a mating flat glass and the contact surface was observed through the mating glass. As a result, the contact area observed at the initial stage was decreased to reach a constant value after repeated sliding. At the initial stage many small abrasion patterns were observed. At the steady state of rubbing the size of individual abrasion pattern became larger and the number of abrasion patterns was reduced. The frictional force per unit length of abrasion patterns gradually increased with the prolonged sliding and then attained to a constant value. In the experiments examined the frictional forces were ranging from 0.3N/mm to 0.5N/mm. Therefore it is found that the cracks underneath the abrasion patterns are propagated by the frictional force.View full abstractDownload PDF (973K) -
Development of High Damping Rubbers by Structural Modification of Natural RubberShin-ichi INOUE, Tomonori TSUCHIYA, Yukio ONOUCHI, Hiroshi OKAMOTO1999 Volume 72 Issue 10 Pages 612-619
Published: 1999
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe High damping rubber for seismic bearing was developed by the structural modification, cis-trans isomerization, of natural rubber (NR). Dimethyl sulfoxide (DMSO), tetramethylene sulfoxide (TMSO), and tetramethylene sulfone, (TMSN) were used for modifiers. The isomerization rates of NR were compared by using the three modifiers. The isomerization rate was -19% in a whole amount for NR. The isomerization of NR gave a high hysteresis loss and lower compression set. The DMSO was more significant for the degree of an activity on the modifiers than that of TMSO and TMSN. Hysteresis loss of the isomeric rubber was about 2.0 times bigger than that of the control (NR), and the compression set of the isomeric rubber was smaller than that of the control. Vulcanization was also remarkably accelerated.View full abstractDownload PDF (992K) -
Takashi KAKUBO, Seiichi KAWAHARA, Yasuyuki TANAKA1999 Volume 72 Issue 10 Pages 620-625
Published: 1999
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSSynthetic cis-1, 4 polyisoprene (IR) was esterified with Stearic acid selectively at 3, 4 units by hydroboration with 9-borabicycro[3.3.1]nonane (9-BBN) followed by esterification with stearoyl chloride. The hydroxylation suppressed the crystallization of IR. The esterification of hydroxylated IR with 0.53wt% stearoyl group resulted in an increase in the rate of crystallization at -25°C, but not with 0.34wt% stearoyl group. A similar stimulation effect was observed by mixing stearic acid of 0.53wt%. The effect of mixed stearic acid on the rate of crystallization of IR was dependent on the amount of mixed or linked stearic acid.View full abstractDownload PDF (777K) -
[in Japanese]1999 Volume 72 Issue 10 Pages 626-627
Published: 1999
Released on J-STAGE: July 09, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (286K)
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