NIPPON GOMU KYOKAISHI
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Volume 34, Issue 10
Displaying 1-4 of 4 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1961Volume 34Issue 10 Pages 777
    Published: 1961
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.34.777
    JOURNAL FREE ACCESS
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  • Studies on Resilience of High Polymers
    X. RESILIENCE OF POLYAMIDE
    K. Fujimoto
    1961Volume 34Issue 10 Pages 778-782
    Published: 1961
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.34.778
    JOURNAL FREE ACCESS
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    Measurements of resilience were made on Nylon 66 and Nylon 6 over the temperature range of -70°C-250°C. In Nylon 66, three dispersion regions, centered at 220°C, 95°C and -25°C, were found, and in Nylon 6, dispersions were found at 70°C and -10°C--30°C. The dispersion at 220°C in Nylon was associated with transition of crystalline structure that the chain packing became more symmetrical. Other dispersion regions were associated with transition of amorphous part. From the estimated apparent activation energy, γ transition was corresponded with motion of polymethylene chains between amide radical, β transition with main chains including one amide radical, and α transition with segment including about 4-5 amide radicals.
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  • Studies on Resilience of High Polymers
    XI. RESILIENCE OF POLYESTER, POLYURETHANE AND POLYETHER
    K. Fujimoto
    1961Volume 34Issue 10 Pages 783-787
    Published: 1961
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.34.783
    JOURNAL FREE ACCESS
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    Measurements of resilience were made on Terylene, Poluran, Urethaneblock polymer, Derline and Penton at various temperature. The α dispersion region, associated with transition region of segmental motion, was observed at 105-110°C, 30°C, -40°C, -50°C and 28°C respectively. An apparent activation energy of α transition of Terylene was 89.4Kcal/mol. In Terylene, β dispersion was found at about -30°C with an apparent activation energy of 9.3Kcal/mol, and it was corresponded to the motion of main chain that has about one repeat unit.
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  • The Oil and Organic Solvent Resistance of Rubbers
    S. Watanabe
    1961Volume 34Issue 10 Pages 787-799
    Published: 1961
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.34.787
    JOURNAL FREE ACCESS
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    The swelling phenomena of rubbers in oils and organic solvents are observed at the temperature from 30°C to 150°C. From these observed results, the diffusion constant and the μ constant are calculated by the Fick′s diffusion law and by the Flory′s swelling equilibrium formula.
    The calculated diffusion constant values (D) of oils are about 10-9cm2/sec., and the values of organic solvents are about 1/100 of values of oils. The activation energy values of D are about 10kcal/mol in oils and about 5k cal/mol in organic solvents. The μ between oils and rubbers are larger than 1.5 in the case of NBR and larger than 0.5 in CR.
    These calculated chemical constants are showed on tables.
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