NIPPON GOMU KYOKAISHI
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Volume 41, Issue 6
Displaying 1-10 of 10 articles from this issue
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  • THE ANALYSIS OF RUBBER BY PYROLYSIS AND TEMPERATURE PROGRAMMED GAS CHROMATOGRAPHY WITH PORAPAK COLUMN
    S. Mashimo, K. Hoshikawas, N. Okubo, T. Watanabe, W. Jono
    1968 Volume 41 Issue 6 Pages 499-504
    Published: June 15, 1968
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.41.499
    JOURNAL FREE ACCESS
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    In this report, rubbers were qualitatively and quantitatively analyzed by pyrolysis and temperature programmed gas chromatography with Porapak-Q column. A sample of rubber was pyrolyzed in a carrier gas stream.
    In this procedure the characteristic peaks were caused in gas chromatogram of each rubber. Thus, qualitative and quantitative analysis were possible except in a few examples; NR and IR, IIR and IBR could not be distinguished because they gave the same gas chromatogram. Gas chromatograms of each rubber, especially its characteristic peaks, were identified by retention volume and infrared spectrogram. Consequently, quantitative methods were carried out successfully about SBR-IIR and SBR-NR blending system as examples.
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  • THE CRYSTALLIZATION BEHAVIOUR AND THE MOLECULAR MOTION AT LOW TEMPERATURES OF THE TRANS-POLYCHLOROPRENES
    R. Nagao
    1968 Volume 41 Issue 6 Pages 505-508
    Published: June 15, 1968
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.41.505
    JOURNAL FREE ACCESS
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    The crystallization behaviour and the molecular motion at low temperatures of the trans-polychloroprenes were measured with volume dilatometry and with broad line proton magnetic resonance absorption method, respectively.
    The trans-polychloroprenes which possess crystallizability show different rates of crystallization; this difference is assumed to depend on the difference in the structural purity (the quantity of the trans-1, 4 configuration).
    The glass transition temperature of the trans-polychloroprenes is assumed to be in the vicinity of-40°C from the value of the activation energy calculated from the relationship between temperature and proton magnetic resonance absorption line width; this temperature is approximately 20 degrees lower than the temperature corresponding to the inflection point of the line width-temperature curve.
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  • THE CRYSTAL-CRYSTAL TRANSITION AND SECOND ORDER TRANSITION OF THE TRANS-POLYBUTADIENES
    R. Nagao
    1968 Volume 41 Issue 6 Pages 509-515
    Published: June 15, 1968
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.41.509
    JOURNAL FREE ACCESS
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    The crystal-crystal transition of a trans-polybutadiene was observed using the X-ray diffraction and volume dilatometry. The temperature range of the crystal-crystal transition was between 33 and 43 °C for the formation of an α-form and between 37 and 26 °C for the formation of a β-form, as assumed from the Xray diffraction of the trans-polybutadiene. The crystal-crystal transition points of β to α and α to β transitions were determined as 38.2 and 31.4°C respectively, at which the ratio of the X-ray diffraction intensities at the main peaks of the β and α forms was equal to unity. The specific volume-temperature curve of the trans-polybutadienes presents α characteristic shape on account of the existence of the crystal-crystal transition.
    The second-order transition temperatures were found to be ca.-100, ca.-60, and ca.-30°C as determined from the volume dilatometry and broad line nuclear magnetic resonance absorption method. The activation energy for the glass transition (at ca.-60 °C) was calculated as approximately 3 kcal/mol.
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  • THE POLYMORPHIC CRYSTALLINE FORMS OF THE TRANS-POLYISOPRENES RELATED TO THE TREATMENT CONDITIONS AND TO THE SPECIFIC VOLUMES AT 0°C
    R. Nagao
    1968 Volume 41 Issue 6 Pages 516-519
    Published: June 15, 1968
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.41.516
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    The relationship between the treatment conditions and the resultant crystalline forms and the relationship between the specific volumes at 0°C and the two crystalline forms of the trans-polyisoprenes were examined using the X-ray diffraction method and volume dilatometry respectively.
    The two relationships found for the former are that some trans-polyisoprenes crystallize in the β form by anneal and that the other trans-polyisoprenes crystallize in the γ form by anneal. The cause of these different crystallization behaviour is assumed to originate from some impurities contained in the polymer in a form of different materials or different structures, these impurities affecting the cooling rates which control the crystalline forms to crystallize under the given treatment conditions.
    The three relationships found for the latter are that the β and γ forms have almost the same specific volume, that the two crystalline forms show different specific volumes, and that the same crystalline form has different specific volumes.
    These complex relationships suggest the complex aspects existing in the two crystalline modifications of trans-polyisoprene which are not fully understood even at present.
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  • EFFECTS OF QUINONE DIOXIME ON THE PEROXIDE CURE OF ETHYLENE-PROPYLENE RUBBER
    IV THE CROSSLINKING OF EPR WITH OXIDE AND OXIDIZING AGENTS
    M. Imoto, Y. Minoura, K. Goto, H. Harada, K. Nishihara, H. Fujita, K. ...
    1968 Volume 41 Issue 6 Pages 520-526
    Published: June 15, 1968
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.41.520
    JOURNAL FREE ACCESS
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    The mechanism of the curing reaction of ethylene-propylene rubber with various curing systems such as p-quinone dioxime-chloranil and p-quinone dioxime-lead dioxide was studied.
    The crosslinking reactions with the oxime compounds-oxidizing agents system were different from those with dicumyl peroxide-oxime compounds system. It seems that p-dinitroso benzene produced by oxidation of oxime caused the crosslinking reaction. When chloranil was used as additive, the cured rubber had a tenddency to bloom and to stick to the mold. In the oxime compounds-lead dioxide curing system, the stocked rubber had a tendency to scorch and the cured substances were foamed. And when lead dioxide was used in the dicumyl peroxide cure of EPDM, the crosslinking reaction rate was accelerated.
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  • [title in Japanese]
    [in Japanese]
    1968 Volume 41 Issue 6 Pages 527-539
    Published: June 15, 1968
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.41.527
    JOURNAL FREE ACCESS
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  • Erratum
    1968 Volume 41 Issue 6 Pages 539
    Published: 1968
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.41.6_539
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1968 Volume 41 Issue 6 Pages 540-549
    Published: June 15, 1968
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.41.540
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1968 Volume 41 Issue 6 Pages 550-555
    Published: June 15, 1968
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.41.550
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1968 Volume 41 Issue 6 Pages 566-567
    Published: June 15, 1968
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.41.566
    JOURNAL RESTRICTED ACCESS
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