Dynamic studies of the interaction between diols and water by ultrasonic methods. Part 2.—Pentane-1,5-diol and hexane-1,6-diol solutions

Abstract

Ultrasonic absorption in the frequency range 15–220 MHz and ultrasonic velocities at 2.5 MHz have been measured in aqueous solutions of pentane-1,5-diol and hexane-1,6-diol at 20 °C. A relaxational excess absorption has been found in solutions of hexane-1,6-diol in the concentration range 1.5–6.0 mol dm^–3, while no or little excess absorption has been observed in solutions of pentane-1,5-diol. The concentration dependences of the relaxation frequency and the maximum excess absorption per wavelength have been analysed by the chemical reaction model associated with the interaction between solute and solvent, and the rate and thermodynamic constants have been evaluated.