Compressibility of binary mixtures of associating liquids

This paper presents the application of ultrasonic methods to investigate the structure of liquid mixtures of polyhydroxyalcohols (glycerol-butanediol¬-1.3 and glycerol-2-methylpentanediol-2.4).
Measurements were carried. out on the propagation of ultrasonic waves at a frequency f = 2.5 MHz over the temperature range 283-303 K and on density over the temperature range 273-303 K for the alcohols and mixtures.
Excess compressibilities were calculated for the systems of inteiest. It was shown that the compressibility of mixtures of associating liquids was deter¬mined not only by specific intermolecular interactions, but also a major role is played by steric factors (the degree of filling the space).