Relaxation of Polystyrene near the Glass Transition Temperature Studied by Acoustic Measurements(Condensed matter: structure and mechanical and thermal properties)
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概要
- 論文の詳細を見る
Two kinds of acoustic experiments have been carried out for polystyrene. An ultrasonic experiment was performed to determine the velocity and attenuation of sound from room temperature up to and slightly above the glass transition temperature T_g. Megahertz-frequency longitudinal and transverse sound waves and the pulse echo method were used in the experiment. An anomaly of the sound wave velocity is observed near T_g; the sound attenuation increases very rapidly. A Brillouin scattering experiment in the right-angle geometry was performed in the same temperature range. The longitudinal acoustic mode of the scattered line was mainly observed. The Brillouin line shift shows an anomaly near T_g; the width of the scattered line and the inverse of the line intensity increase very rapidly near and above T_g. These rapid increases were considered to be due to a thermal-activation-type relaxation, and the experimental results were explained by considering the mechanism of viscosity relaxation based on the Maxwell model.
- 社団法人日本物理学会の論文
- 2007-02-15
著者
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Kobayashi H.
National Cardiovascular center
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Takagi Y.
Department Of Internal Medicine School Of Medicine Keio University
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Hiki Y.
Faculty Of Science Tokyo Institute Of Technology Emeritus
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Hosokawa T.
Department Of Applied Physics And Chemistry The University Of Electro-communications
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HOSHIKAWA K.
Department of Applied Physics and Chemistry, The University of Electro-Communications
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Hiki Y.
Faculty Of Science Tokyo Institute Of Technology
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Hoshikawa K.
Department Of Applied Physics And Chemistry The University Of Electro-communications
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