Excess enthalpies of alkanediamines+benzene or + toluene mixtures: Predictions using group contribution models

The excess molar enthalpies of alkanediamine H2N–(CH2)u−–NH2 (u=2,3,4)+benzene or toluene mixtures were measured using a Calvet microcalorimeter at 303.15 K. Group contribution models, Modified UNIFAC (Lyngby and Dortmund versions ) and DISQUAC have been applied. The effects of the proximity of two NH2 groups in these mixtures is analysed.