Thermal properties of acetamide in the temperature range from 298 K to 400 K

Abstract

The thermal properties of acetamide were investigated by the DTA and DSC methods. It was shown that the stable and unstable modifications of acetamide can be formed from the subcooled melts. The melting enthalpy of the stable hexagonal compound is 264 ± 2 kJ kg −1 and is therefore approximately 50 kJ kg −1 above that of the unstable modification. From the determined thermal capacities a storage density of 310 kJ kg −1 for the temperature range 343.5 to 363.5 is obtained which favours its use as a latent heat storage material. In spite of the high storage density value the application of acetamide for static latent heat storage is not very promising owing to its unfavourable crystallization behaviour.