| Project/Area Number |
08640649
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | Osaka University |
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Principal Investigator |
KANEKO Fumitoshi Graduate School of Science, Osaka University, Lecturer, 大学院・理学研究科, 講師 (70214468)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1996: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | triglyceride / tripalmitin / crystal growth / pores formation / polymorphism / 多孔質 / 顕微赤外分光 |
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| Research Abstract |
Crystallization process of tripalmitin has been studied by means of X-ray diffraction and scattering, IR microscope, Raman scattering and microscope observation. Its crystallization behavior dependes markedly on crystallization temperature Tc as follows ; Tc<40ﾟC : alpha, 45<Tc<50ﾟC : beta', and Tc<50ﾟC : beta. The beta phase, which is the stable phase and has T//type subcell, shows an anomalous crystallization in the temperature region of 51-55ﾟC.Although a single crystal of b gradually grows as plate crystal initially, the growth rate increases abruptly and the crystal grows as a massive crystal.
By specific volume measurement using dilatometry, it is clarified that a rapid decrease in density takes place after a rapid density increase due to crystallization when a massive crystal appears. The density decrease comes from the occurrence of defects in the crystal. The X-ray diffraction and scattering experiment showed that there was no essential differences between the usual beta crystal and the massive beta crystal and that many mm-size pores had been generated in the specimen.
This study has revealed also that the beta phase can be classified into two phases ; b1 obtained by solution and melt crystallization and beta2 obtained by the alpha*beta solid-state transition. Polarized IR spectra showed that the two beta phases differ in the conformation of the glycerol backbone.
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