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Volume 14 (1987)
- Issue 4 Pages 133-
- Issue 3 Pages 95-
- Issue 2 Pages 51-
- Issue 1 Pages 2-
Volume 14, Issue 4
Displaying 1-7 of 7 articles from this issue
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Norio Murase1987 Volume 14 Issue 4 Pages 133-142
Published: October 30, 1987
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSFreezing behavior of cross-linked polymer gels was studied mainly by differential scanning calorimetry. Heat evolution during warming, due to ice crystallization, was sometimes observed below 0°C following precedent cooling to -50°C. It was found, further, that water compartmentalized by the cross-linked network structure remains unfrozen during cooling when the size of the compartments is appropriately small, and that it is the unfrozen compartmentalized water which crystallizes during subsequent warming. The mechanism of anomalous ice crystallization observed during warming was, then, investigated relating to change of the polymer network structure. In this process, it became clear that not only the size of the compartments but also continuity of water between adjacent compartments and flexibility of polymer chains affect freezing behavior of gels. These three factors seem, however, to be interrelated with each other via the density of cross-links of polymers. Therefore, it seems to be necessary to analyse characteristic of compartmentalized water more closely for the clarification of the freezing mechanism of gels. Moreover, the importance of the concept of compartmentalized water in gels, which may form a phase intermediate between continuous and discrete phases, was pointed out in this paper.View full abstractDownload PDF (1196K) -
Shun-ichi Kidokoro1987 Volume 14 Issue 4 Pages 143-153
Published: October 30, 1987
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSSome recent developments of the thermodynamic studies on the multi-state thermal transitions of globular proteins are reviewed. Enphasis has been placed to the statistical mechanical basis and new methods of the scanning calorimetry data analysis for the multi-state system. In the analyses, a thermodynamic state is defined as an ensemble of the microstates of the system, assuming the heat capacity function and two integral constants. Upon these assumptions, the multi-state system can be analyzed by deconvolution method even when the system includes self-dissociation/association process, using the relation between the partition function (or molar fraction function) and the enthalpy function. The obtained thermodynamic parameters are refined by non-linear least squares fitting. By the methods, the thermal transitions of porcine pepsinogen at various pH values are analyzed to be four-state transitions, and the thermal transition of Vibrio parahaemolyticus hemolysin at pH7.0 are estimated to be three-state transition including dimer-monomer equilibrium.View full abstractDownload PDF (1479K) -
Sachio Yasufuku, Takeshi Tanii1987 Volume 14 Issue 4 Pages 154-163
Published: October 30, 1987
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSStatus quo of the application of thermal analysis techniques to the appraisal and quality control of electrical and electronic materials is reviewed. Such thermal analysis techniques as TG, DTA, DSC, TMA, EGA, TSC are dealt with, whereas such electrical and electronic materials as enameled magnet wires, varnishes, epoxide resins, thermoplastic resins including cross-linked polyethylenes, thermosetting resins, mineral base transformer oils, ZnO varistor, rotating machinery insulation systems, printed circuit boards, solder glasses, photoresists, carbon fiber reinforced plastics, electronic ceramics, are investigated by use of the above-mentioned techniques. By taking advantage of these collected data, it is suggested that one can provide a data-base for electrical and electronic materials. Furthermore, it is reasonable to say that when one should develop a new material, one could adopt most suitable thermal analysis technique for its appraisal, referring to the collected data-base. The authors lay particular emphasis on applying extensively these thermal analysis techniques for developing new electronic materials.View full abstractDownload PDF (1182K) -
Masayuki Kamimoto, Tooru Atake1987 Volume 14 Issue 4 Pages 164-170
Published: October 30, 1987
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSDownload PDF (911K) -
A Treatment of DSC Data Based on Ideal Solution TheoryShinichi Kitamura, Yasushi Nakata1987 Volume 14 Issue 4 Pages 171-176
Published: October 30, 1987
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSDownload PDF (781K) -
O. Nara1987 Volume 14 Issue 4 Pages 177-179
Published: October 30, 1987
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSDownload PDF (371K) -
1987 Volume 14 Issue 4 Pages 180
Published: October 30, 1987
Released on J-STAGE: September 07, 2009
JOURNAL FREE ACCESSDownload PDF (112K)
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