Acoustic Relaxations in Toluene and Alcohols in the Frequency Range of 10 to 300 kHz Measured by the Resonance Reverberation Method

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Abstract
The acoustic absorption in toluene at frequencies 10 to 300 kHz is measured by the improved resonance reverberation method. The relaxation is found around 100 kHz (20°C). The relaxation strength increases and the relaxation frequency shifts toward high with increasing temperature. The relaxation is assigned to the coupling of translational motion of molecules with intramolecular vibration of C-H stretching in the methyl group. A good agreement between experiment and theory is obtained in the relaxation strength over covered temperatures. The absorption coefficient of acoustic waves in n-BuOH, i-BuOH and t-BuOH is measured by the same technique as in toluene. The relaxation is observed around 30 kHz (n-BuOH), 20 kHz (i-BuOH), and below 10 kHz (t-BuOH) at 30°C. The activation energy is 8.7 and 9.4 kcal/mole for n-BuOH and i-BuOH, respectively. The relaxation strength decreases with increasing temperature. The relaxation is interpreted in terms of the reaction between associated complexes, cyclic polymer and cyclic dimers.

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