Pressure Dependence of Transitions and Relaxations in Polytetrafluoroethylene
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概要
- 論文の詳細を見る
The ultrasonic absorption and linear thermal expansion behavior of polytetrafluoroethylene in a hydrostatic high pressure vessel (piston and compound cylinder type) capable of achieving 16,000 kg/cm^2 are measured in the temperature from -30℃ to 200℃ and in the pressure from 1 atm. to 5,000 kg/cm^2. Ultrasonic (5 Mc/s carrier frequency) attenuation maxima at atmospheric pressure are found at about -12℃, 30℃, 50℃, 130℃ and 140℃, and pressure dependence of these maxima is found as about 10, 9, 28, 13, and 25 degrees per 1,000 kg/cm^2, respectively. From these facts and the dispersion map, the third, fourth and fifth peaks indicate important informations of existence of segmental motion in amorphous regions (primary dispersion), crystalline dispersion and grain-boundary dispersion, respectively. By a thermodynamical consideration and the thermal expansion behavior, the second peak is defined as the one due to the 30℃ transition.
- 社団法人応用物理学会の論文
- 1968-08-05
著者
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Takemura Tetuo
Department Of Applied Physics Faculty Of Engineering Kyushu University
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Hirakawa Susumu
Department Of Applied Physics Faculty Of Science Fukuoka University
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Hirakawa Susumu
Department Of Applied Science Faculty Of Engineering Kyushu University
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