Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
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Volume 4, Issue 1
Displaying 1-6 of 6 articles from this issue
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  • Excess Enthalpies of Propanediol+Water Systems at 298.15K
    Yoshiyasu Matsumoto, Hidekazu Touhara, Koichiro Nakanishi, Nobuatsu Wa ...
    1977 Volume 4 Issue 1 Pages 3-6
    Published: January 15, 1977
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.4.3
    JOURNAL FREE ACCESS
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    The molar excess enthalpies HE for aqueous solutions of 1, 2-propanediol (1, 2-PD) and 1, 3-propanediol (1, 3-PD) have been measured at 298.15K over the whole concentration range by an isothermal dilution calorimeter. All the solutions exhibit negative enthalpies of mixing. The minimum value of HE for aqueous solution of 1, 2-PD is smaller than that of aqueous solution of 1, 3-PD. The curve of HE against x1 (mole fraction of propanediol) for aqueous solution of 1, 2-PD is highly skewed with sharp minimum at x1 ≅ 0.21 and inflections at x1=0.51. The partial molar excess enthalpies of all the propanediols are almost constant in the middle of the composition range. These results are interpreted qualitatively in terms of specific molecular interactions in aqueous solution.
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  • Analysis of Isothermal Crystallization Phenomena of Monodisperse Polyethylene Melt by Calorimetry and X-ray Diffraction Method
    Kenji Kamide, Kenji Kagawa, Sei-ichi Manabe
    1977 Volume 4 Issue 1 Pages 7-9
    Published: January 15, 1977
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.4.7
    JOURNAL FREE ACCESS
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    Isothermal crystallization phenomena are studied by DSC and the X-ray diffraction method. The theoretical background of measuring the crystallinity, of the polymer during isothermal crystallization, by the X-ray diffraction method is presented. The monodisperse polyethylene fractions, which are prepared by a successive solutional fractionation run, are employed. It is strongly suggested by comparing the results obtained by DSC and the X-ray method that in the former method the role of secondary crystallization can never be overlooked and the change in the exponent n with the extent of crystallization, observed in DSC method, is not due to the molecular weight fractionation during crystallization.
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  • Heat Capacity of Nonstoichiometric Compounds
    Hideaki Inaba, Keiji Naito
    1977 Volume 4 Issue 1 Pages 10-18
    Published: January 15, 1977
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.4.10
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    Difference in molar heat capacity due to nonstoichiometric composition is usually small as the Kopp-Neumann's law predicts, but it becomes large when the terms of heat capacity other than the classical harmonic vibrational term are prominent.
    Origins of the deviation from the Kopp-Neumann's law come from all the terms of heat capacity: lattice heat capacity, heat capacity due to conduction electron, Schottky heat capacity, magnon heat capacity, heat capacity due to vacancy formation and heat capacity of phase transition.
    Especially in the case when the phase transition occurs in nonstoichiometric compounds, the transition behavior depends sharply on nonstoichiometry. The transition temperature, enthalpy and entropy change for the transition as a function of nonstoichiometry obtained by the heat capacity measurement give important information on the mechanism of phase transition.
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  • Temperature measurement (II)
    System design and performance control
    Kiyoto Mitsui
    1977 Volume 4 Issue 1 Pages 19-25
    Published: January 15, 1977
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.4.19
    JOURNAL FREE ACCESS
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  • Standard reference materials for calorimetry and thermal analysis
    Yo-ichiro Mashiko
    1977 Volume 4 Issue 1 Pages 26-27
    Published: January 15, 1977
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.4.26
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  • International DATA series: selected data on mixtures
    Koichiro Nakanishi
    1977 Volume 4 Issue 1 Pages 28-31
    Published: January 15, 1977
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.4.28
    JOURNAL FREE ACCESS
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