Ultrasonic relaxation study in methylcyclohexane and methyl acetate by plano-concave resonator method
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概要
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Ultrasonic absorption measurements in methylcyclohexane and methyl acetate have been carried out over the frequency range 0. 1-10 MHz at temperature of 5-60℃ using a plano-concave resonator method which is useful for ultrasonic relaxation study around 1 MHz. The results shown a typical spectrum of a single relaxation process, from which the relaxation frequency and strength were determined. The temperature dependence of these parameters give the activation enthalpy(⊿H^*)and enthalpy difference(⊿H)between axial and equatorial isomers of methylcyclohexane, and those between cis and trans isomers of methyl acetate. They are:⊿H^*=10. 0 kcal/mol, ⊿H=1. 8 kcal/mol, and ⊿H^*=6. 6 kcal/mol, ⊿H=3. 4 kcal/mol, respectively.
- 社団法人日本音響学会の論文
著者
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TAKAGI Kenshiro
Institute of Industrial Science, University of Tokyo
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Bae Jong-rim
Institute Of Industrial Science University Of Tokyo
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Choi Pak-kon
Institute Of Industrial Science University Of Tokyo
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Takagi Kenshiro
Institute Of Industrial Science The University Of Tokyo
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