Thermodynamic and acoustic properties of binary mixtures of ethers. IV. Diisopropyl ether or oxolane with N,N-dimethylaniline or N,N-diethylaniline at 303.15, 313.15 and 323.15Â K

► We report excess properties of molar volumes, isentropic compressibilities, free lengths. ► Four binary mixtures of diisopropylether or oxolane with N,N-dimethylaniline or N,N-diethylaniline are studied. ► Molecular interactions estimated qualitatively from magnitude of deviations in the properties. ► The free volume and P* effects has significant contributions in excess properties. ► The speed of sound in mixtures were estimated with seven models.