Molar heat capacity and thermodynamic properties of 1,2-cyclohexane dicarboxylic anhydride [C8H10O3]

The molar heat capacity C p,m of 1,2-cyclohexane dicarboxylic anhydride was measured in the temperature range from T =80 to 390 K with a small sample automated adiabatic calorimeter. The melting point T m , the molar enthalpy Δ fus H m and the entropy Δ fus S m of fusion for the compound were determined to be 303.80 K, 14.71 kJ mol −1 and 48.43 J K −1 mol −1 , respectively. The thermodynamic functions [ H T - H 273.15 ] and [ S T - S 273.15 ] were derived in the temperature range from T =80 to 385 K with temperature interval of 5 K. The thermal stability of the compound was investigated by differential scanning calorimeter (DSC) and thermogravimetry (TG), when the process of the mass-loss was due to the evaporation, instead of its thermal decomposition.