Studies on 3,3′-diamino-4,4′-azofurazan (DAAF)

摘要

Abstract The specific heat capacity of 3,3′-diamino-4,4′-azofurazan (DAAF) was determined by a differential scanning calorimetry. In the temperature range of 253–373?K, the specific heat capacity (C p) versus T relationship can be fitted into a linear equation: C p (J?g?1?K?1)?=?0.0028T?+?0.26456. The standard molar heat capacity is 215.53?J?mol?1?K?1 at 298.15?K. According to the relationship between the specific heat capacity and thermodynamic functions, enthalpy, entropy, Gibbs free energy increments [H T–H 298.15], [S T–S 298.15] and [G T–G 298.15] of DAAF from 253 to 373?K with temperature interval of 10?K, relative to the standard temperature 298.15?K were calculated. The combustion energy of DAAF was measured by a precise IKA C5000 oxygen-bomb calorimeter to be Δc U?=??(13188.43?±?32.77) J?g?1. The standard molar enthalpy of combustion at 298.15?K was determined to be Δc H