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Volume 53, Issue 12
Displaying 1-12 of 12 articles from this issue
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R. P. Lattimer, K. R. Welch, [in Japanese]1980 Volume 53 Issue 12 Pages 713-718
Published: 1980
Released on J-STAGE: April 16, 2008
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[in Japanese]1980 Volume 53 Issue 12 Pages 719-727
Published: 1980
Released on J-STAGE: April 16, 2008
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[in Japanese]1980 Volume 53 Issue 12 Pages 728-729
Published: 1980
Released on J-STAGE: April 16, 2008
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FATIGUE PROCESS (PART V), FATIGUE FAILURE MECHANISM AND CRITICAL CRACKKunihiko FUJIMOTO, Tetsuhiko MIGITA1980 Volume 53 Issue 12 Pages 730-737
Published: 1980
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSIn order to study the fatigue failure mechanism of vulcanieates, scission of rubber molecules, initiation of surface crack, and role of critical crack under uniaxial repeated constant stress have been investigated for pure and carbon black filled rubber vulcanizates. It is found that the fatigue failure of vulcanizates is caused by the instability of the system when the crack which is formed or grown by the propergation of fracture energy generated by the fracture of localized rubber clusters under repeated stress exceeds a certain critical size. If the above condition is not fulfilled, the system is estimated to repeat the redistribution or balancing of stress, the changing of its higher order structure, and the internal fracture without macroscopic failure.View full abstractDownload PDF (536K) -
1980 Volume 53 Issue 12 Pages 737
Published: 1980
Released on J-STAGE: April 16, 2008
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REACTION OF SQUALENE AND COBALT NAPHTHENATEMichio ASHIDA, Shunsuke OONO, Satoshi KAN1980 Volume 53 Issue 12 Pages 738-744
Published: 1980
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSMixtures of squalene and cobalt naphthenate and/or sulfur were heated in the atmosphere or nitrogen gas. The products were separated by column chromatography and analyzed by infrared and NMR spectroscopy. The appearance of a definite small peak at 1.35ppm of vulcanized squalene may be due to the chemical shift of-CH=CH-by addition of sulfur. Squalene did not react with cobalt naphthenate at 150°C in nitrogen gas. In the atmosphere, the oxidation of squalene was accelerated by cobalt naphthenate which decomposed in to naphthenate and cobalt. The NMR spectrum of the product obtained from the mixture of squalene, cobalt naphthenate and sulfur showed a strong resonance at 1.25ppm which represented -C-CH2- group. A similar NMR spectrum was observed from the product of the mixture of squalene, cobalt stearate and sulfur. The finding suggests that the addition reaction occurred between squalene and some cobalt salts in the presence of sulfur. When a zinc plate was heated in the mix solution of squalene, cobalt naphthenate and sulfur, it is found by XMA that large amounts of cobalt and sulfur transferred to the surface of the zinc plate.View full abstractDownload PDF (478K) -
CROSSLINKING REACTION OF POLYURETHANE WITH METAL-CONTAINING AMINE COMPOUNDShinji INAGAKI, Eisuke YAMADA, Hiroshi OKAMOTO, Junji FURUKAWA1980 Volume 53 Issue 12 Pages 745-750
Published: 1980
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSThe metal-containing compounds which have amine substituents at each ends of the molecular chain were prepared and were then added in the process of one shot mixing method of polyurethane formation. And then, the mechanical and thermal properties of the product were examined.
Amine compounds prepared are bis (4-amino phenoxy) dimethyl silane, 1, 4-bis (4-amino phenoxy dimethyl siloxy) benzene and di-butyltin bis (4-amino benzoate).
As the results, both the tensile strength and elongation at break of polyurethane increased with increasing the amount of these compounds, and stress relaxation time was found to be longer than that of the conrol sample.View full abstractDownload PDF (391K) -
[in Japanese]1980 Volume 53 Issue 12 Pages 750
Published: 1980
Released on J-STAGE: April 16, 2008
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Shinji INAGAKI, Yukio ONOUCHI, Hiroshi OKAMOTO, Junji FURUKAWA1980 Volume 53 Issue 12 Pages 751-755
Published: 1980
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSThe telomers containing carboxyl groups on both ends of their chain were prepared by the photo-radical telomerization of styrene and dithiodiglycolic acid. The compounding effect of telomer and epoxy resin for IR, BR, SBR, NBR and EPDM was examined.
The compounding processability of rubbers and the tensile properties of rubber vulcanizates were improved by the addition of these telomers. Rubber vulcanizates having the excellent tensile and adhesion properties were obtained by the use of telomer together with epoxy resin.View full abstractDownload PDF (333K) -
RECLAMATION OF CRUSHED TIRE SCRAP WITH THIOL AND AMINE DERIVATIVESYukio ONOUCHI, Shinji INGAKI, Hiroshi OKAMOTO, Junji FURUKAWA1980 Volume 53 Issue 12 Pages 756-762
Published: 1980
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSThe reclamation of crushed tire scrap of passenger cars was carried out by a mechano-chemical procedure with thiol and amine derivatives that act as an effective reclaiming agent.
From the swelling measurement of SBR vulcanizates in benzene solution containing a small amount of reclaiming agent, it was found that thiophenol, p-chlorothiophenol, n-butylamine and dimethylamine contributed considerably to the degradation of vulcanizates. Moreover, the thiol-amine complex was found to serve as a breaker of crosslinking which present in the form of di- and poly-sulfide linkages.
These reclaimed rubbers obtained by the mechano-chemical procedure with thiol and amine derivatives have low Mooney viscosity and these re-vulcanizates showed a excellent tensile properties. For an example, the re-vulcanizates having a tensile strength of 16.7MPa were obtained by the use of binary reagents such as thiophenol and n-butylamine or morpholine.View full abstractDownload PDF (498K) -
RAPID AND HIGH RESOLVABLE METHOD FOR THE MEASUREMENTS OF PLASTICITY AND ITS INHOMOGENEITY OF RUBBER MATERIALS, (I)Takae KUSANO, Kenkichi MURAKAMI, Tsutomu YAMAKAWA1980 Volume 53 Issue 12 Pages 763-767
Published: 1980
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSFor unfilled rubber materials, a penetrating method was adopted to improve the performance of measurement of Mooney viscosity.
When a needle just like a rocket is penetrated into rubberlike materials at a constant rate, the force received by the needle increases with increasing penetration depth. The work obtained from the area of the plot of force vs. depth was called PW by us. Correspondence of PW to Mooney viscosity was well. The sensitivity of the penetrating response is quite good over a wide range of the plasticity with good reproducibility. Moreover, the inhomogeneity of plasticity in the sample can be also measured simultaneously. PW value was represented by a linear relationship against logarithmic penetrating rates.
According to the results of the experiment, this method can be applied to on-line measurement of process.View full abstractDownload PDF (337K) -
OXIDATIVE DEGRADATION OF VARIOUS SYNTHETIC RUBBERS BY PHENYLHYDRAZINE-IRON (II) CHLORIDE SYSTEMNariyoshi KAWABATA, Ichiro HIGUCHI, Shinzo YAMASHITA1980 Volume 53 Issue 12 Pages 768-771
Published: 1980
Released on J-STAGE: April 16, 2008
JOURNAL FREE ACCESSDegradation of various synthetic rubbers and related polymers by phenylhydrazine-iron(II) chloride system was investigated in benzene solution at 30°C under air. The polymers were found to undergo the degradation in the following order of ease: synthetic isoprene rubber>cis-1, 4-polybutadiene>styrene-butadiene rubber_??_chloroprene rubber_??_1, 2-polybutadiene>butyl rubber>polystyrene.View full abstractDownload PDF (274K)
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