Abstract
Molar isobaric heat capacities, Cpm, and molar excess isobaric heat capacities, CpmE, are reported for 1-butanol, 1-octanol or 1-decanol+benzylamine systems at (293.15, 308.15, 318.15, 333.15)K. CpmE values were measured with a Setaram Micro DSC II microcalorimeter using a scanning method. The investigated mixtures are characterized by large and positive CpmE(x1=0.5) values at 298.15K, which remarks that self-association and/or solvation effects are predominant in such solutions. The CpmE 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, CpmE(x1=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 CpmE(x1=0.5) change with temperature is sharper for the solutions with the mentioned alcohols. The observed decrease of CpmE(x1=0.5) with the increasing of the chain length of the alcohol at enough high temperatures may be explained in similar terms.
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