The Temperature Dependence of the Ultrasonic Relaxation Process Due to Interaction between Water and Allyl Cellosolve

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Abstract
Ultrasonic absorption and velocity measurements have been performed in aqueous solutions of Allyl Cellosolve (ethylene glycol monoallyl ether) as functions of the concentration and the temperature. Only a single relaxational absorption has been observed in the frequency range from 15 to 220 MHz and, it has been attributed to the perturbation of the equilibrium expressed as AB\ightleftharpoonsA+B, where A and B are the solute and the solvent molecule respectively. The rate constants at various temperatures have been determined from the concentration dependence of the relaxation frequency, and the thermodynamic parameters associated with the reaction have been calculated. The enthalpy change has also been estimated from the concentration dependence of the maximum excess absorption per wavelength. From these results, it has been concluded that Allyl Cellosolve molecules act as water structure promoters and that the interaction between the solute and the solvent is due to hydrogen bonding. Furthermore, the rate and the thermodynamic properties obtained are compared with those for aqueous solutions of other ethers.

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