Thermoacoustical analysis of solutions of poly(ethylene glycol) 200 through H-bond complex formation

Densities (ρ) and ultrasonic velocities (u) of binary mixtures of poly(ethylene glycol) 200, PEG, with ethanolamine, m-cresol and aniline have been measured at various concentrations at 293.15, 303.15 and 313.15 K and have been fitted by third order polynomial equations at each temperature. The calculated values of isentropic compressibility (ks), free volume (Vf), internal pressure (πi), relaxation time (τ) and surface tension (σ) at different mole fractions of PEG have been used to explain the hydrogen bonding and intermolecular interactions present in the mixture. Using these data, excess molar volume (VE), excess intermolecular free length (image), excess acoustic impedance (ZE) and excess pseudo-Grüneisen parameter (ГE) have been calculated and the results have been fitted to Redlich–Kister polynomial equation. All the results support each other and help in understanding the interactions in the mixture. Various models and mixing rules have been applied to evaluate the ultrasonic velocity data and have been compared with the experimental results.