NIPPON GOMU KYOKAISHI
Print ISSN : 0029-022X
Volume 53, Issue 1
Displaying 1-10 of 10 articles from this issue
  • [in Japanese]
    1980 Volume 53 Issue 1 Pages 1
    Published: 1980
    Released on J-STAGE: April 16, 2008
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1980 Volume 53 Issue 1 Pages 2
    Published: 1980
    Released on J-STAGE: April 16, 2008
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1980 Volume 53 Issue 1 Pages 3-8
    Published: 1980
    Released on J-STAGE: April 16, 2008
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1980 Volume 53 Issue 1 Pages 9-16
    Published: 1980
    Released on J-STAGE: April 16, 2008
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1980 Volume 53 Issue 1 Pages 17-33
    Published: 1980
    Released on J-STAGE: April 16, 2008
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1980 Volume 53 Issue 1 Pages 34-36
    Published: 1980
    Released on J-STAGE: April 16, 2008
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1980 Volume 53 Issue 1 Pages 37-40
    Published: 1980
    Released on J-STAGE: April 16, 2008
    JOURNAL FREE ACCESS
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  • Analysis of the Stress-strain Behaviors of Rubber Vulcanizates According to a Modified Mooney-Rivlin Equation
    Hiroshi OKAMOTO, Shinji INAGAKI, Junji FURUKAWA
    1980 Volume 53 Issue 1 Pages 41-46
    Published: 1980
    Released on J-STAGE: April 16, 2008
    JOURNAL FREE ACCESS
    A modified Mooney-Rivlin equation was obtained by replacing their strain function with the proposed one as
    f=2(C1*+C2*/α)(αm/2ln1+α/αm/1-α/αm-1/α2)
    The modified Mooney-Rivlin equation was applied for the stress-strain curves of various kinds of rubber vulcanizates. As a result of the plotting, a good linear relationship was experimentally obtained. Among the parameters, that is, C1, C2, C1* and C2*, the following tendency was recognized with few exceptions.
    i) C1*<C1, ii) C2*>C2, iii) C1*+C2*≥C1+C2
    Comparing the modified Mooney-Rivlin equation with the proposed elastic equation, the following relations were obtained
    νkT=2C1*
    b=C2*m/αln1+α/αm/1-α/αm-2/α3)
    The proportionality between νkT and C1* was well recognized and the slope of a straight line had nearly a value of 2. On the other hand, the proportional correlation between b and C2* held only in the same kind of curing system
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  • Stress-strain Behavior of Polyurethane Elastomer
    Shinji INAGAKI, Eisuke YAMADA, Hiroshi OKAMOTO, Junji FURUKAWA
    1980 Volume 53 Issue 1 Pages 47-53
    Published: 1980
    Released on J-STAGE: April 16, 2008
    JOURNAL FREE ACCESS
    A new rubber elastic equation derived from a uniform stress hypothesis was applied to analyze the stress-strain curves of polyurethane elastimers. Good applicability of the presented equation for many experimental data was obtained for both the extension and the retraction curve of hysteresis cycle as well as the ordinary bulk rubber vulcanizates. The parameters, such as vkT, b, C1 and C2 are obtained from this plot and Mooney-Rivlin plot. In general, b and C2 terms harv larger values than those of bulk rubber vulcanizates. The fact can be explained by the network structure of polyurethane being composed of pseudo crosslink. The proportional relationship was obtained between vkT and C1, b and C2.
    In the case of one-shot type polyurethane, these parameters increased with increasing concentration of urethane linkage.
    On the other hand, for millable type polyurethane, vkT and C1 increased, and b and C2 decreased with increasing crosslinking density. Under elevated temperatuer, the values of b and C2 became small. The apparent activation energy obtained from Arrhenius plot was within the values of 3-5Kcal/mol.
    From these results, it can be considered that b and C2 are the parameters concerned with internal viscous flow.
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  • Stress-strain Behavior of Polyurethane Elastomers Modified by the Addition of Vinyl Monomer
    Shinji INAGAKI, Eisuke YAMADA, Hiroshi OKAMOTO, Junji FURUKAWA
    1980 Volume 53 Issue 1 Pages 54-60
    Published: 1980
    Released on J-STAGE: April 16, 2008
    JOURNAL FREE ACCESS
    In the earlier papers, a modification of polyurethane elastomers was carried out by addition of several kinds of vinyl monomers, in a one-shot polymerization system in the presence of triethylene diamine and epoxy resin as a catalyst. In this study, the stress-strain curve of modified polyurethane was analyzed with our proposed elastic equation and Mooney-Rivlin equation. And then the behavior of vinyl monomer in the polyurethane matrix was discussed by the use of the parameters such as vkT, b, C1 and C2 obtained by the plot of both equations.
    As the result, vkT and C1 concerned with primary linkage came to have high values by addition of vinyl monomers. Mean while b and C2 arising from the weak secondary linkage decreased with an increasing amount of the vinyl monomers. Furthermore, the temperature dependency of b and C2 with respect in these vinyl monomer-modified polyurethanes was dower than that of the control or the polymer blended one.
    These results suggest that the vinyl monomers were blocked with the polyether segment at the stage of polyurethane formation.
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