Abstract
In order to elucidate the effect of a solvent on ultrasonic relaxation, ultrasonic absorption and dispersion were measured in solutions of 1,1,2-trichlorethane and acetone. 1,1,2-trichlorethane shows ultrasonic relaxation due to rotational isomerism, and acetone is a polar solvent. The ultrasonic pulse method was applied to measure ultrasonic absorption and velocity. The concentration of solutions was changed from 0 to 100 mole% at 20°C. The measurements were performed at 20, 30, and 40°C for 90, 50, and 10 mole% solutions. In all cases, the characteristic values of the ultrasonic absorption and dispersion were calculated assuming a single relaxation time, and the effects of concentration and temperature were discussed. The experimental results were compared with the theoretical equations of ultrasonic absorption and dispersion in rotational isomerism, and the energy difference between the rotational isomers, the height of potential barrier of internal rotation and the velocity of isomerization reaction were derived.
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