Direct Observation of Crystal Transformation Process of Poly (vinylidene fluoride) under High Pressure by PSPC X-Ray System
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概要
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A PSPC (position sensitive proportional counter) X-ray system was employed to directly observe the crystal transformation processes of poly (vinylidene fluoride) at high pressures and high temperatures. X-ray diffraction measurements performed with a heating rate of 5℃/min have revealed that Form I structure is formed after the melting of Form II structure at high pressures above 3, 500 kg/cm^2. This result provides a solid proof for the origins of multiple endothermic peaks observed in the DTA melting trace at high pressures. Changes in X-ray diffraction patterns during annealing process at a temperature below the melting temperature of Form II structure under 4, 000 kg/cm^2 were followed and it has been shown that Form II structure performs a crystal transformation into Form I structure with an activation energy of about 30 kcal/mol.
- 社団法人応用物理学会の論文
- 1978-03-05
著者
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Matsushige Kazumi
Department Of Applied Science Faculty Of Engineering Kyusyu University
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Matsushige Kazumi
Department Of Applied Science Faculty Of Engineering Kyushu University
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Nagata Kiyofumi
Department Of Applied Physics Faculty Of Science Fukuoka University
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Nagata Kiyofumi
Department Of Applied Science Faculty Of Engineering Kyusyu University
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Takemura Tetuo
Department Of Applied Science Faculty Of Engineering Kyusyu University
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Takemura Tetuo
Department Of Applied Physics Faculty Of Engineering Kyushu University
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