In
the current study, molecular forces in the binary fluids of
dimethylbenzylamine and normal alkanols (1-propanol, 1-butanol, 1-pentanol,
and 1-hexanol) were studied at 298.15–318.15 K regarding experimental
values of density and speed of sound. Negative values of excess molar
volume, V
m
E, and isentropic compressibility deviation,
Δκs, were obtained for all binary mixtures.
Findings indicate that an increase in alcohol chain length reduces
its interaction with dimethylbenzylamine molecules. The ERAS (Extended
Real Associated Solutions) model and the PFP (Prigogine–Flory–Patterson)
theory were applied to correlate the excess molar volumes, and the
outcomes of the two models indicate that for all binary mixtures,
the agreement between two sets of data is acceptable. Experimental
density and speed of sound for the above binary mixtures have not
been reported in the scientific literature yet.