Thermodynamic Properties of Binary Liquid Systems of Morpholine and Butylamines at Varying Temperatures

Abstract

This study measured thermophysical parameters such as density (ρ), speed of sound (u), and viscosity (η) for binary liquid systems containing morpholine and butylamines (mono-, di-, and tri-butylamine) at three temperatures (303.15 K, 308.15 K, and 313.15 K) under atmospheric pressure. On the basis of the experimental findings, thermodynamic properties such as excess molar volume (\({V}_{m}^\text{E}\)), excess molar isentropic compressibility (\({k}_{s,m}^\text{E}\)), and deviation in viscosity (\(\Delta \eta\)) were calculated. These were then fitted to a Redlich–Kister (R–K) polynomial. For all binary systems, ∆η is positive, whereas \({V}_{m}^\text{E}\) and \({k}_{s}^\text{E}\) are negative. The findings for the binary liquid systems under research suggest the existence of new H-bonding and packing efficiency interactions between dissimilar components. Moreover, how temperature impacts molecular interactions between molecules using thermodynamic results is discussed.