N. Eckardt et al., THE CIS-TRANS ISOMERIZATION OF AZOBENZENE IN THE MOLTEN STATE - A USEFUL TEST REACTION FOR THE KINETIC EVALUATION OF DSC MEASUREMENTS, JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 52(1), 1998, pp. 177-185
Contrary to the situation in the field of temperature, heal and heat f
low rate calibration, so far no generally accepted and easily practica
ble chemical reaction exists with regard to a kinetic evaluation. A po
ssible reaction would be the well-known first-order cis-trans isomeriz
ation of subcooled liquid azobenzene. Surprisingly, the evaluation of
measurements performed with a power compensated calorimeter yields act
ivation parameters, which are dependent on the hearing rate. The desme
aring of the curves does not produce any improvements. However, consta
nt activation parameters are obtained, if a small self-heating of the
sample during the exothermic reaction is taken into account.