Artigo
Preparation and thermal study of Mg-diclofenac compound in solid state
Fecha
2012-04-01Registro en:
Journal of Thermal Analysis and Calorimetry. Dordrecht: Springer, v. 108, n. 1, p. 213-218, 2012.
1388-6150
10.1007/s10973-011-1416-x
WOS:000302704500029
8498310891810082
7471310113999140
0000-0002-7984-5908
Autor
Ctr Univ Norte Paulista UNORP
Universidade Estadual Paulista (Unesp)
Resumen
The thermal behaviour of Mg-diclofenac compound was evaluated by simultaneous TG-DTA and DSC. The profile of the DSC curves showed that this compound possesses two transition phases: endothermic and exothermic between 170-180 degrees C and 185-195 degrees C, respectively. The endothermic reaction is reversible (enantiotropic). Thus, different experimental conditions, i.e. masses sample, open and crimped lids crucible, static and dynamic atmospheres were utilized for DSC analysis for evaluation of this transition phase. In a static atmosphere the enantiotropic reaction was not observed. The obtained data were utilized to obtain the kinetic parameters, which were calculated by the Capela and Ribeiro method. The results show that the activation energy for the transition phase depends on the different experimental conditions.