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Predecessor
Volume 46, Issue 5
Displaying 1-11 of 11 articles from this issue
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J. Peter, [in Japanese]1973 Volume 46 Issue 5 Pages 357-360
Published: 1973
Released on J-STAGE: April 16, 2008
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R. W. Wise, D. Pica, [in Japanese]1973 Volume 46 Issue 5 Pages 361-368
Published: 1973
Released on J-STAGE: April 16, 2008
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[in Japanese]1973 Volume 46 Issue 5 Pages 369-377
Published: 1973
Released on J-STAGE: April 16, 2008
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[in Japanese]1973 Volume 46 Issue 5 Pages 378-383
Published: 1973
Released on J-STAGE: April 16, 2008
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[in Japanese]1973 Volume 46 Issue 5 Pages 384-388
Published: 1973
Released on J-STAGE: April 16, 2008
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[in Japanese]1973 Volume 46 Issue 5 Pages 389-396
Published: 1973
Released on J-STAGE: April 16, 2008
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BOUND RUBBER IN IR/BR BLEND: (2) ADDITION OF CARBON BLACK BY SOLUTION MASTERBATCH METHODKazutoshi ABE, Michio ASHIDA, Teizo WATANABE1973 Volume 46 Issue 5 Pages 397-403
Published: 1973
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSThree types of IR and BR were mixed with carbon blacks by means of the solution masterbatch method. The rubber-carbon mixtures were blended with the other elastomer by passing through the mill, and thereby the bound rubber was analyzed by pyrolysis gas chromatography. When BR was added to the NR masterbatch loaded with HAF, most of the bound rubber consisted of NR component, which reached a maximum value and reduced slowly with the number of mill passes. In the case of BR masterbatch loaded with HAF, the bound rubber was composed of NR and BR and each of them varied in the same way that the NR component in the case of NR masterbatch did with the number of mill passes. Milling the preblend of NR and BR showed that the NR component in the bound rubber decreased and the BR component increased as the number of mill increased. EPC black adsorbed more of rubber from the solution than HAF black. The ratio of IR/BR in the bound rubber which combined with EPC black was lower than that of IR/BR in the case of HAF black. When HAF was reduced, no bound rubber was formed.View full abstractDownload PDF (590K) -
Minoru YAMADA, Shigeharu ARAI, Yasushi MASUDA1973 Volume 46 Issue 5 Pages 404-410
Published: 1973
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSChemical stress relaxation and evolution of hydrogen chloride on the thermal degradation of epichlorohydrin rubbers were measured, and the mechanism of thermal degradation was postulated.
The degradation of epichlorohydrin rubbers was found to proceed in two steps. It is considered that it involves autooxidation as the first step and degradation by hydrogen chloride resulting from oxidation as the second step. The second step may be regarded as a degradation accompanied with softening.
As for the heat resistance CHC is much inferior to CHR. This may be attributed to the degradation of polyethyleneoxide block through the back-biting reaction by hydrogen chloride.
It was found that polyhydroxylaromatic carboxylic acids such as gallic acid have a stabilization effect.View full abstractDownload PDF (497K) -
Isao YAMAJI, Masako WATANABE1973 Volume 46 Issue 5 Pages 411-415
Published: 1973
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSIt has been found by Carlson et al. that, when the extracted vulcanizates are heated at about 200°C, a sufficient amount of soluble polymer in carbon disulfide can be supplied to permit infrared analysis.
By utilizing this heating technique, we made three calibration curves on vulcanized binary blends of known compositions consisting of NR-SBR, NR-BR and SBR-BR. The characteristic absorption bands used were 840cm-1 for NR, 700cm-1 for SBR and 730cm-1 for BR.
With the same heating technique and absorption bands, three calculated polymer ratios could be obtained on the each of several ternary blends of NR-SBR-BR by using two of above three calibration curves. Among these three calculated ratios, those which were obtained using two calibration curves including the component of largest quantity in each blend were nearest to the blended ratio.View full abstractDownload PDF (388K) -
Nobuhiro KAWASAKI, Yoshinori YAMAGATA, Shotaro OHNO, Tutomu HASHIMOTO1973 Volume 46 Issue 5 Pages 416-421
Published: 1973
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSThe die swelling phenomenon of polychloroprene/glass-beads blends after extruded through a capillary was investigated.
The die swell of the blends depends not upon the diameter of glass-beads, but upon the amount of polychloroprene itself. And the shear modulus obtained from the relation between end correction coefficient ν and shear stress Sw increases with an increase in the volume fraction of glass-beads according to a blend model that a hard sphere exists in a cubic polymer matrix.
The above results show that the hardness of a glass-bead contributes to the increase of shear modulus of the system, that is, the difficulty of deformation, and that the recoverable shear strain after deformed depends on the amount of polychloroprene which is a continuous matrix.View full abstractDownload PDF (505K) -
1973 Volume 46 Issue 5 Pages 422-423
Published: 1973
Released on J-STAGE: April 16, 2008
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