Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
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Volume 31, Issue 5
Displaying 1-3 of 3 articles from this issue
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  • Thermodynamic Investigations and Characterization of Some Alloys in Ternary Pb-Au-Bi System
    Dragana Zivkovic, Biserka Trumic, Zivan Zivkovic
    2004 Volume 31 Issue 5 Pages 227-233
    Published: November 30, 2004
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.31.227
    JOURNAL FREE ACCESS
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    The results of thermodynamic investigations and characterization of some alloys in ternary Pb-Au-Bi system are presented in this paper. Partial and integral molar quantities were determined in the temperature range of 873∼973K, based on the comparative thermodynamic analysis done experimentally using Oelsen calorimetry and analytically using Redlich-Kister-Muggianu model. Characterization of chosen lead-based ternary alloys were done using DTA, XRD and SEM analysis.
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  • Ordered Structures in Mesoscopic Scale of Amphiphilic Block Copolymers
    Hirohisa Yoshida
    2004 Volume 31 Issue 5 Pages 234-240
    Published: November 30, 2004
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.31.234
    JOURNAL FREE ACCESS
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    The nano-scale ordered structure and phase transitions of amphiphilic di-block copolymers consisted of hydrophilic poly (ethylene oxide) and hydrophobic poly (methacrylate) derivatives having azobenzene (AZO) moieties as ester groups, p(EO)mpMA(AZ)n, were reviewed. Hexagonal-packed PEO cylinder structure, caused by micro phase separation of amphiphilic di-block copolymers were selectively formed in wide copolymer content and temperature ranges for p(EO)mpMA(AZ)n. The order of hexagonal cylinder depended strongly on the annealing temperature, however, slightly on copolymer content. The series of p(EO)mpMA(AZ)n showed four endothermic transitions on heating. From the simultaneous DSC-XRD measurements, four phase transitions were assigned, in the order of the low to high temperatures, as the melting of PEO, the melting of AZO moieties, the transition from smectic C to smectic A and the isotropic transitions, respectively. AZO moieties acted as megenic groups. The formation of hexagonal cylinder structure was expected as the results of entropy loss casued by liquid crystalline formation. The director orientation of the liquid crystalline state would be the key in producing the single crystalline nano-scale ordered hexagonal cylinder structure.
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  • DSC and TMA of High Polymers
    Minoru Todoki
    2004 Volume 31 Issue 5 Pages 241-248
    Published: November 30, 2004
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.31.241
    JOURNAL FREE ACCESS
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    Fundamentals of apparatuses and analyses of DSC and TMA were described for polymeric materials.
    In apparatuses, measuring principles were explained firstly and secondly the two confusing problems of DSC, i. e., why two types of DSC, heat-flux DSC and power-compensation DSC, do still exist, and why their charts adopt opposite direction for Y-axis were elucidated from their historical and measuring aspects.
    In analyses, enthalpy and volume-temperature relationships of low molecular weight substance were reviewed and apparently unusual behaviors of polymers were pointed out. Finally nanosize behavior of polymer crystals was emphasized as the most important topic among them and their zero-entropy-production melting was exemplified for nylon 6 fibers, comparing with their conventional melting.
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