Studies of ExcessThermodynamic Properties of BinaryMixtures of Dibutylamine with 2‑Methyl-1-Propanol, 2‑Propanol,and 1‑Butanol at Different Temperatures

To comprehend the molecular interactions between amines and alcohols, the present section reports our measurements of densities (<i>ρ</i>), speeds of sound (<i>u</i>), and viscosities (<i>η</i>) of dibutylamine (DBA) with 2-methyl-1-propanol, 2-propanol, and 1-butanol over the entire composition range at different temperatures and atmospheric pressure. Redlich–Kister polynomial equation has been used for the correlation of excess properties with composition. The negative value obtained for excess molar volume (<i>V_m^E</i>) and excess molar isentropic compressibility (<i>K_S,m^E</i>) shows the presence of strong molecular interactions. The calculated apparent molar volume <i>V</i>_φ,1 and apparent molar compressibility <i>K</i>_φ,1 predicts the volume contraction of the solution with the addition of alcohol to DBA. The results of <i>V_m^E</i> have also been confirmed with the help of Prigogine-Flory-Patterson theory. The viscosity data have also been correlated by using various semiempirical relations of viscosity.