Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
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Volume 28, Issue 4
Displaying 1-6 of 6 articles from this issue
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  • Deuteration Induced Phase Transitions in Zero-dimensional Hydrogen Bonded Crystals M3H(XO4)2
    Noriko Yamamuro, Takasuke Matsuo
    2001 Volume 28 Issue 4 Pages 164-166
    Published: August 31, 2001
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.28.164
    JOURNAL FREE ACCESS
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    The origin of deuteration induced phase transitions in zero-dimensional hydrogen bonded crystals M3H(XO4)2 is discussed based on the experimental results on the heat capacity and the neutron powder diffraction. The phase transitions in the deuterated compounds are of order-disorder type with respect to the deuteron position on the hydrogen bond. Proton tunnelling plays an essential role in this large isotope effect.
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  • Heat Capacity 1. Introduction
    Tooru Atake
    2001 Volume 28 Issue 4 Pages 167-174
    Published: August 31, 2001
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.28.167
    JOURNAL FREE ACCESS
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    Elementary concepts of heat capacity are reviewed, and the important role of heat capacity in the thermodynamic studies of materials is explained. The definition of heat capacity is given at first, and the peculiar properties of liquid water are pointed out on the basis of classical thermodynamics. At low temperatures, the heat capacity of solids is described by quantum mechanics, and the Einstein and Debye models are introduced in this regard. The heat capacity of solids is described with some examples from new functional materials.
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  • Temperature Control Modes in Thermal Analysis
    Takeo Ozawa
    2001 Volume 28 Issue 4 Pages 175-182
    Published: August 31, 2001
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.28.175
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    Nowadays various temperature control modes are used in thermal analysis; i. e., isothermal run, constant rate heating and cooling, sample-controlled thermal analysis, temperature jump, rate jump, temperature modulation, repeated temperature scanning, simulation for process development and temperature control for sample thermal history. Their advantages and drawbacks are reviewed with some illustrative examples, especially for application to kinetic analysis. The combined use of these modes is recommended to elucidate whole thermal behavior. Effect of heat transfer on the observed results is discussed for temperature modulation, repeated temperature scanning and jumps, and possibility of the imaginary part of the overall reaction rate constant in complex reactions is postulated, which is thought to appear in these modes together with the heat transfer effect.
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  • Thermal Properties of Biodegradable Polymers
    Hyoe Hatakeyama
    2001 Volume 28 Issue 4 Pages 183-191
    Published: August 31, 2001
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.28.183
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    Thermal properties of the prepared saccharide- and lignin-based polyurethanes (PU's), and polycaprolactones (PCL's) were studied by differential scanning calorimetry (DSC), thermogravimetry (TG) and TG-Fourier transform infrared spectroscopy (FTIR). Glass transition temperatures (Tg's), cold-crystallization temperatures (Tcc's) and/or melting temperatures (Tm's) of saccharide- and lignin-based PU's and PCL's were determined by DSC, and phase diagrams were obtained. Tg's of saccharide- and lignin-based PU's increased with increasing saccharide and lignin contents, suggesting that those plant components act as a hard segment in PU's. Tg's of saccharide- and lignin-based PCL's decreased with increasing CL/OH ratio until this ratio reaches a certain value (usually ca. 10), suggesting that PCL chains act as a soft segment. However, when the CL/OH ratio becomes larger than the above certain value which is dependent on the kind of saccharides and lignin, the Tg's of polycaprolactone derivatives increase with increasing CL/OH ratio because of the appearance of a crystalline structure. TG-FTIR analysis of lignin-based PCL's suggested that compounds having C-O-C, C=O and C-H groups are mainly produced by thermal degradation of PCL chains.
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  • [title in Japanese]
    2001 Volume 28 Issue 4 Pages 192
    Published: August 31, 2001
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.28.192
    JOURNAL FREE ACCESS
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  • The Application of Control Rate Thermal Analysis for Ceramic Parts in the Sintering
    Yasuaki Masuda, Hiroaki Satoh
    2001 Volume 28 Issue 4 Pages 193-194
    Published: August 31, 2001
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.28.193
    JOURNAL FREE ACCESS
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