Thermodynamics of mixtures containing amines. XVI. of 1-butanol, 1-octanol or 1-decanol + benzylamine systems at (298.15, 308.15, 318.15 and 333.15) K

Abstract Molar isobaric heat capacities, C pm , and molar excess isobaric heat capacities, C pm E , are reported for 1-butanol, 1-octanol or 1-decanol + benzylamine systems at (293.15, 308.15, 318.15, 333.15) K. C pm E values were measured with a Setaram Micro DSC II microcalorimeter using a scanning method. The investigated mixtures are characterized by large and positive C pm E ( x 1 = 0.5 ) values at 298.15 K, which remarks that self-association and/or solvation effects are predominant in such solutions. The C pm E curves are skewed towards higher mole fractions of the alcohol, which suggests that alcohol-amine interactions are more probable in that region. In addition, for a given 1-alkanol, C pm E ( x 1 = 0.5 ) decreases when temperature increases, due to alcohol dissociation is larger at elevated temperatures. The lower self-association of longer 1-alkanols and lower solvation effects may explain that the C pm E ( x 1 = 0.5 ) change with temperature is sharper for the solutions with the mentioned alcohols. The observed decrease of C pm E ( x 1 = 0.5 ) with the increasing of the chain length of the alcohol at enough high temperatures may be explained in similar terms.