Excess Physicochemical Properties and Intermolecular Interactions of 1-Propanol + 1,2-Diaminopropane + Methyl Acetate Ternary Mixtures at Temperatures 298.15–318.15 K

In the present study, physicochemical properties such as density (ρ), refractive index (n^D), viscosity (η), and speed of sound (c) were experimentally determined for ternary liquid mixtures containing 1P (1-propanol) (x₁) + 1,2-DAP (1,2-diaminopropane) (x₂) + MAc (methyl acetate) (1-x₁-x₂) at 0.1 MPa pressure and within the temperature range of 298.15– 318.15 K. Experimental data were used to determine the excess molar volume $V_m^E$, deviation in viscosity Δη, deviation in refractive index Δn^D, excess isentropic compressibility $k_s^E$, deviation in the speed of sound Δc, excess available volume $V_a^E$, excess intermolecular free length ${L_f}^E$, and excess free volume $V_f^E$. These evaluated properties were fitted to the Singh equation. The excess molar volume data were correlated using the Cibulka and Nagata equations. The speed of sound values were interpreted using JFLT (Jacobson’s Free Length Theory) and CFT (Collision Factor Theory). Besides the experimental part, the structural effects between like and unlike molecules, variation in temperature, and composition have been interpreted in terms of intermolecular interactions in the studied liquid mixtures.