Ultrasonic behaviour of the system water + propylene glycol

Abstract

The effect of propylene glycol on the temperature of adiabatic compressibility minimum (t.a.c.m.) and sound velocity maximum (t.s.v.m.) in water have been studied. The structural contribution to the shift in t.a.c.m. and t.s.v.m., [ΔT_βstr.]_exp. and [ΔT_{u str.}]_exp., have been found to be negative: these values increase linearly with mole fraction X₂ of propylene glycol. The results have been explained as due to the disintegration of the hydrogen-bonded clusters of water into monomers by propylene glycol.