作者:Marcelo Kobelnik、Douglas Lopes Cassimiro、Clóvis Augusto Ribeiro、Diógenes dos Santos Dias、Marisa Spirandeli Crespi
DOI:10.1007/s10973-010-0787-8
日期:2010.12
The Ca–diclofenac compound was prepared. Thermogravimetry (TG), derivative thermogravimetry (DTG), differential scanning calorimetry (DSC), X-ray diffraction powder patterns, and microscopy analysis were used to characterize this compound. Details concerning the stages of dehydration, transition phase, and thermal decomposition as well as data of the kinetic parameters of these stages have been described here. The kinetic study of these stages was evaluated from several heating rates with a sample mass of 2 and 5 mg in open crucibles under nitrogen atmosphere. The obtained data were evaluated with the isoconversional kinetic method, where the value of activation energy (E a/kJ mol−1) was evaluated in function of the conversion degree (α). The results show that this compound is hygroscopic. The obtained data lead to a dependence on the sample mass, which results in two kinetic behavior patterns.
制备了钙双氯芬酸化合物。研究人员使用热重法(TG)、导数热重法(DTG)、差示扫描量热法(DSC)、X 射线衍射粉末图谱和显微镜分析法对该化合物进行了表征。本文介绍了脱水、过渡阶段和热分解阶段的详细情况以及这些阶段的动力学参数数据。这些阶段的动力学研究是在氮气环境下的开放式坩埚中,以 2 和 5 毫克样品质量的几种加热速率进行评估的。所获得的数据采用等转化动力学方法进行评估,其中活化能值(E a/kJ mol-1)与转化率(α)呈函数关系。结果表明,这种化合物具有吸湿性。所获得的数据与样品质量有关,从而产生了两种动力学行为模式。