Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
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Volume 12, Issue 2
Displaying 1-7 of 7 articles from this issue
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  • Thermal Stability of Poly (ethylene glycol) Complexes
    Satoshi Izumikawa, Yuko Kambe
    1985 Volume 12 Issue 2 Pages 57-60
    Published: April 05, 1985
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.12.57
    JOURNAL FREE ACCESS
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    Poly (ethylene glycol) (PEG) oligomer forms itself into a complex with barbiturates and with urea. The stability of the complexes was studied by kinetic analysis of TG curves for thermal decomposition in N2. Activation energies obtained by the OZAWA method are 106.8 and 84.7kJ mol-1 for the urea-PEG 4000 complex and urea, respectively. The time required for 10% weight decrease at the isothermal condition of 100°C was 7 hours for the urea-PEG complex while it was only 3 hours for pure urea. The activation energies of the barbiturate complexes found are nearly equal to those of corresponding pure barbiturates. The urea complex decomposes according to the first order mechanism but the decomposition of barbiturate complexes is expressed as the zero order reaction.
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  • Development of the Concepts of Stability and Resonance Energy for Aromatic Compounds
    Jun-ichi Aihara
    1985 Volume 12 Issue 2 Pages 61-72
    Published: April 05, 1985
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.12.61
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    Since Kekulé's discovery of the benzene structure, chemists have been seeking a generally acceptable definition of aromatic stabilization. Their efforts resulted in a variety of ideas and indexes concerning aromatic chemistry. Most of them, however, failed even to attribute aromaticity to cyclic π-electron conjugation. Some indexes have shared the name “resonance energy”. Dewar defined in 1965 what is called Dewar-type resopance energy. It was epoch-making, in that an aromatic compound was characterized reasonably by its positive value. The absence of double-bond reactivity in an aromatic compound was then associated with an extra thermodynamic stability inherent in such a cyclic π-electron system. We devised a graph theory of aromaticity in 1975, and succeeded in explaining many physicochemical aspects of an aromatic compound within a single theoretical framework. This theory enabled us to evaluate Dewar-type resonance energy with no fitting of parameters.
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  • Thermal Behavior of Binary Liquid Crystals Induced by Charge-Transfer Interaction
    Yoshio Matsunaga
    1985 Volume 12 Issue 2 Pages 73-83
    Published: April 05, 1985
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.12.73
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    Owing to their wide range of industrial utility and also as the most reliable method of identification, binary systems of liquid crystals have been a topic of extensive studies. The starting point of this article is the formation of charge-transfer complexes in the liquid crystalline state; therefore, the scope is limited to the enhancement of thermal stability of liquid crystals in such systems. The component compounds are not necessarily mesogenic. Various para-disubstituted benzenes can be employed as one of the components. Finally, emphasis is laid on the liquid crystals produced by mixing of nonmesogenic electron donor and acceptor. The effects of branching of alkyl group on the induction of liquid crystals are also described.
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  • Calorimetry course for beginners IX
    Vaporization and sublimation calorimetry
    Kazuhito Kusano
    1985 Volume 12 Issue 2 Pages 84-94
    Published: April 05, 1985
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.12.84
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  • Thermoanalytical Investigations of Technical Products in the Automobile Industry
    W. Hädrich, H. Pfaffenberger, M. Kamimoto
    1985 Volume 12 Issue 2 Pages 95-100
    Published: April 05, 1985
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.12.95
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    Thermoanalytical techniques are becoming more and more widely used in the car industry. The sample preparation is usually simple and the measuring and evaluation times normally short. Compared with other methods one measurement provides a great deal of information. All these reasons guarantee thermal analysis a large industrial application in the future. Using typical examples of thermal analysis applications in the motor-car industry, the efficiency and versatility of these techniques is discussed.
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  • Paints and Thermal Properties
    T. Tanaka
    1985 Volume 12 Issue 2 Pages 101-102
    Published: April 05, 1985
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.12.101
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  • Japanese and Chinese equivalent terms in thermal analysis
    T. Ozawa
    1985 Volume 12 Issue 2 Pages 103-104
    Published: April 05, 1985
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.12.103
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