Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
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Volume 25, Issue 3
Displaying 1-4 of 4 articles from this issue
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  • Thermal Properties of the Complex of bis-iso-butanediamine Nickel(II) Chloride, [Ni(i-bn)2]Cl2
    Yoshio Masuda, Noriko Suto, Yoshinori Ihara
    1998 Volume 25 Issue 3 Pages 51-55
    Published: July 31, 1998
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.25.51
    JOURNAL FREE ACCESS
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    [Ni(i-bn)2]Cl2, was isomerized thermally from a square planar structure to a cis octahedral one by the coordination of counter ion, Cl-, at around 180-190°C, where i-bn is isobutanediamine (2-methyl-1, 2-propanediamine). The isomerization was accompanied by thermochromism from yellow to light blue. When the yellow complex was permitted to stand for a few hours in air, it was converted to trans-[Ni(H2O)2(i-bn)2]Cl2·2H2O and the color changed from yellow to violet.
    The dehydration of trans-[Ni(H2O)2(i-bn)2]Cl2·2H2O took place simultaneously with the anation of Cl- ions at around 50°C. On the dehydration-anation, the structure of the complex changed from a trans octahedral to a cis octahedral without forming the square planar structure, and the color changed from violet to light blue.
    The isomerization of [Ni(i-bn)2]Cl2 and the dehydration-anation of trans-[Ni(H2O)2· (i-bn)2]Cl2·2H2O were considered to be the Avrami-Erofe'ev type reactions, and the activation energies were evaluated to be 305.7 and 59.2kJ mol-1, respectively.
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  • The Thermo-Oxidative Degradation of Polyacetal Resin by TG-DTA-FTIR
    Yukihiro Saito, Satoshi Kobayashi, Kouichi Nishida
    1998 Volume 25 Issue 3 Pages 56-66
    Published: July 31, 1998
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.25.56
    JOURNAL FREE ACCESS
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    The thermo-oxidative degradation of polyacetal resins and paraformaldehyde have been studied with non-isothermal thermogravimetric method. The evolved gases by the thermo-oxidative degradation of polyacetal resins and paraformaldehyde were identified by simultaneous thermogravimetry-differential thermal analysis-Fourier transform infrared spectroscopy (TG-DTA-FTIR). The polyacetal copolymer was more stable than the homopolymer since the DTG peak temperature of the copolymer was about 28 degrees higher than the peak of homopolymer. It was found that the activation energy (ΔE) for the thermal degradation of homopolymer, the copolymer and paraformaldehyde were 121.8kJ mol-1, 133.7kJ mol-1, and 79.8kJ mol-1, respectively. The value for the paraformaldehyde gives an agreement with the binding energy of OC-H bond. It was found that the thermo-oxidative degradation of polyacetal resin was accompainied by endothermic reaction and elimination of formaldehyde. In the case of the homopolymer, the desorption of formaldehyde gases was observed at the melting point.
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  • Two Types of Adiabatic Hydration Calorimeters and An Instrument for Measuring Equilibrium Vapor Pressure for Zeolites
    Tadato Mizota, Noriaki Nakayama
    1998 Volume 25 Issue 3 Pages 67-72
    Published: July 31, 1998
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.25.67
    JOURNAL FREE ACCESS
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    Three instruments, such as an adiabatic vapor-hydration calorimeter, an adiabatic water-hydration calorimeter, and an instrument for measuring equilibrium vapor pressure, have been made in order to clarify zeolite characters for the development of a zeolite-water heat pump systems. Structural details for these three instruments were shown with handling procedures for sample zeolites. It is emphasized that precise description on states of a zeolite, especially on the water content, is needed to obtain useful data for investigating the zeolite-water system.
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  • [title in Japanese]
    1998 Volume 25 Issue 3 Pages 73
    Published: July 31, 1998
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.25.73
    JOURNAL FREE ACCESS
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