NIPPON GOMU KYOKAISHI
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Volume 64, Issue 11
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1991 Volume 64 Issue 11 Pages 655-664
    Published: 1991
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.64.655
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1991 Volume 64 Issue 11 Pages 665-666
    Published: 1991
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.64.665
    JOURNAL FREE ACCESS
    Download PDF (230K)
  • [title in Japanese]
    [in Japanese]
    1991 Volume 64 Issue 11 Pages 667-668
    Published: 1991
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.64.667
    JOURNAL FREE ACCESS
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  • BOND OF ANTIOXIDANTS TO NBR BY COMBINATION OF REACTIVE AGENT, SPACER AND ANTIOXIDANTS
    Kunio MORI, Koji SAKAI, Kosaku TAMURA
    1991 Volume 64 Issue 11 Pages 669-676
    Published: 1991
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.64.669
    JOURNAL FREE ACCESS
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    New type reactive antioxidants consisting of the combination of reactive agents, spacers and antioxidants have been investigated. These three components reacted each other during vulcanization to change triazine thiol-type reactive antioxidants. The formed triazine thiol-type reactive antioxidants were combined to NBR molecules by help of curing agents during vulcanization. In some combinations, triazine trithiols-N-methylole-aminodiphenylamine system had the highest % Bond of antioxidants. On the other hand, the selection of curing system was of importance to force to combine the antioxidants to NBR during vulcanization. The small amount of sulfur curing system consisting of TMTM, NBTS, sulfur and Vulcalent E was best for the % bond and monosulfide content. Newly developed reactive antioxidant system gave higher heat resistance than commercial antioxidants to NBR vulcanizates and slight lower heat resistance than copolymer with antioxidant groups. New reactive antioxidant system, however, was effective for application to various grades more than the copolymer system.
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  • EVALUATION OF BIODEGRADABLE PLASTICS ADDED STARCH BY LAY-IN-SOIL TEST (I)
    Yoshito OTAKE, Yoko GOMI, Tomoko KOBAYASHI, Shigeki ITO, Kenichiro HYA ...
    1991 Volume 64 Issue 11 Pages 677-687
    Published: 1991
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.64.677
    JOURNAL FREE ACCESS
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    Biodegradable plastics, LDPE, L-LDPE, HDPE, PP, added starch and other additives (imperfect degradation type) were pretreated in some kind of soil which was examined as clear as possible and tested the effect of microorganism to the polymer degradation. The results gave the fact that the polymer degradation enlarged with increasing abundance of microorganism.
    On the base of this consequence, after the lay-in-soil test used compost which has more abundance of microorganism than other soil was carried out for eight months, mainly observing the interface of polymer and starch by using SEM, we confirmed the presense of several passing void (about 200μmφ) regarded as lost of polymer, and also confirmed tat the number of void and the degree of polymer damage were inversely proportional to the crystallinity of polymer. And in the vicinity of the void edge, the degradation was enlarged as closer to void, so it was assumed that the reason of polymer lost was the progress of polymer degradation and decay occuring consumption of starch at the same time, and never eaten by insects.
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  • EVALUATION OF BIODEGRADABLE PLASTICS ADDED STARCH BY LAY-IN-SOIL TEST (II)
    Yoshito OTAKE, Tomoko KOBAYASHI, Yoko GOMI, Shigeki ITO, Kenichiro HYA ...
    1991 Volume 64 Issue 11 Pages 688-698
    Published: 1991
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.64.688
    JOURNAL FREE ACCESS
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    Continued from a previous report, the evaluation of lay-in-soil test defined treatment condition carried out for eight months for the biodegradable plastics, LDPE, L-LDPE, HDPE, added starch and other additives. As a result, a lowering of physical property and a little of weight loss were recognized on samples treated in high bioorganismic activity soil. In addition, it was recognized that the added starch and oil reduced and the oil accelerated the degradation of polymer at lay-in-soil treatment. The starch was not directly concerned to polymer degradation, but with oil it accerelated polymer degradation. As a result, increasing of carbonyl groups, lowering of oxidation initiation temperature, change of melting point and so on were observed. At the vigorous degradation parts around the void which was the result of polymer lost, element O suggesting oxidation, S, Fe, Al and S were observed concentrically by surface analysis using EPMA.
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1991 Volume 64 Issue 11 Pages 699-702
    Published: 1991
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.64.699
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1991 Volume 64 Issue 11 Pages 705-706
    Published: 1991
    Released on J-STAGE: July 09, 2007
    DOIhttps://doi.org/10.2324/gomu.64.705
    JOURNAL RESTRICTED ACCESS
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