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Volume 47, Issue 2
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[in Japanese], [in Japanese]1974 Volume 47 Issue 2 Pages 73-86
Published: February 15, 1974
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSDownload PDF (2178K) -
[in Japanese], [in Japanese]1974 Volume 47 Issue 2 Pages 87-97
Published: February 15, 1974
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSDownload PDF (1906K) -
STUDY ON RUBBER TO METAL BONDING IIHideo NISHIMOTO, Hidenori MATSUSHIMA1974 Volume 47 Issue 2 Pages 98-103
Published: February 15, 1974
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSOn the first report, we have concluded that the adhesive force of brass coating by diffusion was remarkably low and the adhesive force improved by drawing regardless coating. Based on these results, we have studied the change of adhesive force by diffusion and drawing condition regarding the adhesion between brass coating by diffusion and basic compounded rubber, thereon investigated on the adhesiveness of diffusion coated brass structure. And the results were as follows; the brass coating by diffusion were unactivity comparing with the cyanized brass coating, but the crystals were subdivided by drawing, therefore the copper atoms activated and the adhesiveness improved. And the number of activated copper crystals were distributed following the Gauss' error function for the diffusion time. On the other hand, maximum adhesive force changed suddenly at about 500°C in diffusion temparature.View full abstractDownload PDF (1085K) -
Takashi KITADA1974 Volume 47 Issue 2 Pages 104-112
Published: February 15, 1974
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSIt is assumed that the cell structures of sponge rubber are one of sphere type. For the practical calculation, octadecahedral cell is treated as sphere cell.
The octadecahedral cell has hexagonal shadow shape and its vertical parts are directed in parallel with force direction. Center portions of 6 square plates are bended by compression without horizontal displacement of square sides.
The stress under compression is calculated on square plate by the equation of force equilibrium on bending thin plate.
The equation of the stress-strain relation for rubber sponge under compression is proposed, by using such parameters as diameter (sponge cell), Young's modulus (rubber), apparent density (sponge), real density (rubber) and Poisson ratio number (rubber).
It is examined by the experimental data of rubber sponge whether the stress-strain relation of square plate represents its relation with real sponge structure.
Then, the critical load of sponge deformation is estimated by using experimental data.View full abstractDownload PDF (1331K) -
Yoshiro NAKAMURA, Kunio MORI, Masahiro SHIMIZU, Rikio NAGATOMI, Takaom ...1974 Volume 47 Issue 2 Pages 113-115
Published: February 15, 1974
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe elongation change at break of polyepichlorohydrin vulcanizate after the thermal aging (120°C, 4days) has been discussed in regard to the vulcanization velocity of the three vulcanizing agent systems.
The vulcanizate from 2-butylamino-4, 6-dimercapto-s-triazme · MgO has been found to show the lowest elongation change at break (-0.4%) comparing with other vulcanizates from hexamethylenediamine carbamate·Pb3O4 and 2-mercaptoimidazoline·Pb3O4, in the presence of antioxidant nickel dibutyldithiocarbamate.
2-mercaptobenzimidazole which is an active antioxidant to polyepichlorohydrin vulcanizate owing to the weak vulcanizing action has been found not to be preferable to the vulcanizate with the titled property.View full abstractDownload PDF (542K) -
MODIFICATION OF SYNTHETIC RUBBERS (II)H. Okamoto, S. Inagaki, Y. Onouchi1974 Volume 47 Issue 2 Pages 116-119
Published: February 15, 1974
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSWith α, α'-azobisisobutyronitrile as an initiator, the telomerization of styrene with carbon tetrachloride was carried out in a variety of conditions, and the telomers of various degrees of polymerization were prepared. The compounding effects of them for NBR, BR and SBR was examined.
The Mooney viscosity of these synthetic rubbers compounded telomers were fairely lower, and the processibility was improved exceedingly.
On the properties of vulcanized rubbers, the compounding effects of telomers was remarkably recognized for NBR and BR, but was not entirely noticed for SBR. Especially, the tensile strength of carboxylated NBR compounded telomers was found to equal to that of carbon black compound.View full abstractDownload PDF (511K) -
MODIFICATION OF SYNTHETIC RUBBERS (III)Hiroshi OKAMOTO, Shinji INAGAKI, Yoshio ONOUCHI, Hitoshi TOMOKIYO1974 Volume 47 Issue 2 Pages 120-124
Published: February 15, 1974
Released on J-STAGE: October 16, 2009
JOURNAL FREE ACCESSThe telomers containing reactive groups on its chain ends, which were obtained by the telomerization of styrene with carbon tetrachloride or styrene with bromoform, were prepared. The compounding effects of these telomers for EPDM was examined.
The processibility of EPDM on roll was facilitated by the addition of these telomers. For example, the Mooney viscosity (ML1+4, 100°C) of EPDM added telomers was 3040. Moreover, the addition of telomers was comparatively progressed the tensile properties of vulcanized EPDM.
For reasons of these effects, it was seemed that the reaction between the telomers and rubbers proceeded.
The compounding effects of telomers on the peroxide-vulcanized EPDM was larger than that on the sulfur-vulcanized.View full abstractDownload PDF (613K) -
1974 Volume 47 Issue 2 Pages 125-126
Published: February 15, 1974
Released on J-STAGE: October 16, 2009
JOURNAL RESTRICTED ACCESSDownload PDF (350K)
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