NIPPON GOMU KYOKAISHI
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Volume 36, Issue 7
Displaying 1-6 of 6 articles from this issue
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  • VULCANIZATION OF SYNTHETIC LIQUID RUBBERS USING A METAL CHLORIDE-HALO-ORGANIC COMPOUND SYSTEM
    NON-SULFUR VULCANIZATION OF SYNTHETIC RUBBERS. I.
    J. Furukawa, S. Yamashita, H. Matsushita, S. Oka
    1963 Volume 36 Issue 7 Pages 601-605
    Published: 1963
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.36.601
    JOURNAL FREE ACCESS
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    In the presence of a metal chloride (as catalyst)-halo-organic compound (as co-catalyst) system, liquid rubbers such as Hycar 1312, Neoprene FB and Frosbrene, were found to crosslink to give solid vulcanizates at ordinary vulcanization temperature. In the absence of the co-catalyst, however, they afforded no satisfactory vulcanizate except Neoprene FB. The curing system of stannous chloride-benzotrichloride was one of the active one′s. For example, the compound of 100 parts of Flosbrene MV with 4 to 6 parts of SnCl2•2H2O and 5 parts of benzotrichloride was cured at 142.8°C. to give a vulcanizate with 94 to 100° Shore hardness.
    Many sorts of catalyst-co-catalyst systems for liquid rubbers were tested and some mechanisms of such crosslinking reactions were suggested.
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  • VULCANIZATION OF BUTADIENE-ACRYLONITRILE RUBBER USING A METAL CHLORIDE-HALOORGANIC COMPOUND SYSTEM
    NON-SULFUR VULCANIZATION OF SYNTHETIC RUBBERS. II
    J. Furukawa, S. Yamashita, H. Matsushita, S. Oka
    1963 Volume 36 Issue 7 Pages 606-609
    Published: 1963
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.36.606
    JOURNAL FREE ACCESS
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    An attempt was made to vulcanize butadiene-acrylonitrile rubber using a binary system of stannous chloride or zinc chloride and a halo-organic compound such as liquid chloroparaffin, polyvinyl chloride or polychloroprene.
    These polyhalo-compounds exhibited powerful co-catalytic effects and the vulcanizates cured with these non-sulfur curing system showed higher values of abrasion resistance, modulus, hardness and tensile strength at break than those of vulcanizates cured with sulfur, but the former stocks had more tendency to premature vulcanization.
    It is interesting from practical view point that liquid chloroparaffin and polyvinyl chloride may be used in rubber stocks as a reactive plasticizer and a reactive filler respectively.
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  • VULCANIZATION OF BUTADIENE-STYRENE RUBBER AND CIS-1, 4 POLYBUTADIENE USING A METAL CHLORIDE HALO-ORGANIC COMPOUND SYSTEM
    NON-SULFUR VULCANIZATION OF SYNTHETIC RUBBERS. III
    J. Furukawa, S. Yamashita, H. Matsushita, S. Oka
    1963 Volume 36 Issue 7 Pages 609-612
    Published: 1963
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.36.609
    JOURNAL FREE ACCESS
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    It was found that a metal chloride-halo-organic compound system was able to vulcanize stocks based on butadiene-styrene rubber or cis-1, 4 poly-butadiene.
    Curing rates of such rubber stocks were very high and the stocks were more scorchy than sulfur curing system. The strength, elongation and hardness of the vulcanizates from these non-sulfur curing systems indicated higher values than those of sulfur cured vulcanizates.
    In these non-sulfur vulcanizations, EPC black exhibited better reinforcing ability than HAF black but zinc oxide inhibited these vulcanizations, where as stearic acid and zinc stearate enhanced scorching tendency and lowered the modulus of the vulcanizates.
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  • THE MECHANISM OF OZONE CRACKING OF RUBBERS
    II. EXPERIMENTS
    Y. Inagaki, T. Shiga, T. Arai
    1963 Volume 36 Issue 7 Pages 613-619
    Published: 1963
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.36.613
    JOURNAL FREE ACCESS
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    In this paper, we discussed the relation between the theoretical consideration of the mechanism of ozone cracking on rubber surface (as it had mentioned in Part I1) previously, ) and its experimental results.
    Observing the surface change of unstrained and strained rubbers exposed in the ozonized air by electromicroscopy, we noticed that the surfaces of unstrained rubbers were covered with the stable oxidized films and however, on the surfaces of strained rubbers the ozone cracks grew.
    On the other hand, we succeeded in showing experimentally that migration of the anti-ozonants to rubber surface was related to their ozone-resistance properties.
    Then, from these facts we showed that it is possible to explain how the shapes of ozone cracks varied with the ozone concentration and amount of stress given on rubber specimens, by applying the theoretical consideration mentioned in Part I and furthermore, by introducing the concepts of the stress relaxation of rubber surfaces.
    The experimental results like the reation between elongation ratio of rubbers and the time until cracks occur, the effects of softeners, and the effects of concentration of ozone and anti-ozonants were consistent with the results of the theoretical consideration mentioned in Part I.
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  • [title in Japanese]
    [in Japanese]
    1963 Volume 36 Issue 7 Pages 620-629
    Published: 1963
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.36.620
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1963 Volume 36 Issue 7 Pages 682-683
    Published: 1963
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.36.682
    JOURNAL RESTRICTED ACCESS
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