NIPPON GOMU KYOKAISHI
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Volume 49, Issue 4
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  • [title in Japanese]
    [in Japanese]
    1976 Volume 49 Issue 4 Pages 309-326
    Published: April 15, 1976
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.2324/gomu.49.4_309
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1976 Volume 49 Issue 4 Pages 327-340
    Published: April 15, 1976
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.2324/gomu.49.4_327
    JOURNAL FREE ACCESS
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  • THE EXPRESSION OF A MORE GENERAL CHEMICAL RELAXATION CURVE THAN MAXWELLIAN DECAY ONE
    Kenkichi Murakami
    1976 Volume 49 Issue 4 Pages 341-344
    Published: April 15, 1976
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.2324/gomu.49.4_341
    JOURNAL FREE ACCESS
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    In the oxidative degradation of a plenty of rubber vulcanizates at high temperature, their stress decays are principally caused by the random scission along the main chain.
    Equation (I) is obtained for such rubber vulcanizates with impurities, because a stationary oxidative reaction occurs owing to such impurities._??_(I)
    The chemical relaxation in eq.(I) follows the well-known Maxwellian decay curve which is shown by eq.(II)._??_(II)
    On the other hand, a modified equation (III) instead of eq.(I) is available for rubber vulcanizates with less impurities of refined vulcanizates because of unstationary oxidation._??_(III)
    The chemical relaxation in eq.(III) shows the Modified Maxwellian decay curve shown by eq.(IV)._??_(IV)
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  • CAUSE OF THE DIFFERENCE IN THE CROSSLINKING REACTIVITY BETWEEN POLYEPICHLOROHYDRIN AND ITS COPOLYMER WITH DITHIOL-S-TRIAZINE
    ACCELERATING ACTION OF POLYOXYETHYLENE COMPOUNDS IN THE CROSSLINKING OF CHLORINE-CONTAINING POLYMER
    Yoshiro NAKAMURA, Kunio MORI, Takaomi SAITO
    1976 Volume 49 Issue 4 Pages 345-349
    Published: April 15, 1976
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.2324/gomu.49.4_345
    JOURNAL FREE ACCESS
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    The difference in the crosslinking reactivity between epichlorohydrin rubber (CHR) and its copolymer (CHC) with2anilino-4, 6-dithiol-s-triazine (AF) has been explained from the oxyethylene group which is in CHC structure.The oxyethylene group tends to increase the reactivity of thiol group of AF and to increase the compatibility of AF to CHC.Then, oxyethylene-containing compounds such as polyethylene glycol and its monolauryl ether have been selected as an excellent accelerator for the CHR-crosslinking with AF.Polyethylene glycol monolauryl ether has been found also to accelerate the crosslinking reaction with AF in chlorinecontaining polymers such as acryl rubber, butyl rubber, chlorinated polyethylene, and poly (vinyl chloride).
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  • FUNDAMENTAL STUDIES ON THE DEGRADATION MECHANISM OF RUBBER VULCANIZATES (I)
    THE EFFECT OF DIFFUSION OF OXYGEN IN THE STEADY STATE
    Katsumichi ONO, Akitoshi KAERIYAMA, Kenkichi MURAKAMI
    1976 Volume 49 Issue 4 Pages 350-354
    Published: April 15, 1976
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.2324/gomu.49.4_350
    JOURNAL FREE ACCESS
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    The effect of diffusion of oxygen on the film thickness of a sample of rubber vulcanizate in chemorheological studies has not been studied so far.
    The purpose of the present work is to derive an equation which represents the relation between the rate of chain scission. qav. and the film thickness 2l in the steady state of diffusion and oxidation reaction.
    In conclusion, the next equation (1) has been derived which indicates the relation between qav. and 2l.qav·l=Sc0√Dk/ε·tanh(0√k/D·l)(1)
    Furthermore, an equation (2) which represents the distribution of oxygen concentrations in the film thickness has been derived.c=Sc0cosh(√k/D·x)/cosh(0√k/D·l)(2)
    Here, D: diffusion constant, k: first order rate constant of oxygen consumption, ε: scission efficiency of polymer chains, S: solubility coefficient, C: oxygen concentration, C: oxygen concentration in the air.
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  • RECLAMATION OF VULCANIZED RUBBER BY CHEMICAL DEGRADATION (I)
    PREPARATION OF REACTIVE LIQUID RUBBER FROM PULVERIZED SCRAP TIRES
    Shinzo YAMASHITA, Nariyoshi KAWABATA, Kimio MORI, Toshihiro FUJII
    1976 Volume 49 Issue 4 Pages 355-359
    Published: April 15, 1976
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.2324/gomu.49.4_355
    JOURNAL FREE ACCESS
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    Ozonized oxygen was bubbled into pulverized scrap tire swollen and suspended in chloroform at room temperature.The ozonized rubber was reduced by the addition of lithium aluminum hydride in tetrahydrofuran, and liquid rubber possessing hydroxyl group was obtained.The liquid rubber was easily vulcanized with use of diphenylmethane diisocyanate in the presence of carbon black.The residue of the ozonization was found to be a better reinforcement for rubber than the pulverized scrap tire itself.However, the conversion of liquid rubber was low at present, and further investigation upon the reaction conditions and cheap reducing agent would be necessary before practical application of the process.
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  • RECLAMATION OF VULCANIZED RUBBER BY CHEMICAL DEGRADATION (II)
    A NEW CHEMICALLY RECLAIMING PROCESS FOR PULVERIZED SCRAP TIRES
    Shinzo YAMASHITA, Nariyoshi KAWABATA, Kimio MORI, Toshihiro FUJII
    1976 Volume 49 Issue 4 Pages 360-367
    Published: April 15, 1976
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.2324/gomu.49.4_360
    JOURNAL FREE ACCESS
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    This paper describes an attempt to soften vulcanized rubber by chemical reactions with use of atmospheric oxygen and various chemicals. Experimental results showed that ferrous chloride-phenylhydrazine system was the most effective softening reagent examined. Individual use of the two chemicals was much less effective. The ferrous chloride-phenylhydrazine system considerably softened pulverized scrap tire mainly composed of natural rubber during several hours under the atmospheric pressure at the temperature up to 120°C The softened rubber easily twined on the roll and showed good properties for processing. The softened rubber was revulcanized by press at140°C with use of sulfur and vulcanization accelerator. Tensile strength and elongation at break of the revulcanized rubber were about 60 kg/cm2 and about 300%, respectively. The use ofappropriate modifier increased the tensile strength of revulcanized rubber to 100 kg/cm2, which is superior to that of the corresponding revulcanizates of commercially reclaimed rubber. The use of ferrous chloride was found to show no bad influence upon the thermal stability of the revulcanized rubber, since the rubber was more stable than the corresponding vulcanizates of commercially reclaimed rubber. This new chemically reclaiming process for vulcanized rubber was found to be applicable to waste tire of passenger cars mainly composed of SBR, reclamation of the latter rubber has been very difficult.
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  • [title in Japanese]
    1976 Volume 49 Issue 4 Pages 368-369
    Published: April 15, 1976
    Released on J-STAGE: March 05, 2013
    DOIhttps://doi.org/10.2324/gomu.49.4_368
    JOURNAL RESTRICTED ACCESS
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