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目前,用热分析技术研究固体热分解反应动力学成了一个十分活跃的研究领域.但是,不同的研究者所公布的动力学参数往往有很大的差别,其原因固然是多方面的,最主要的是没有一种可靠的方法判别正确的分解反应机理.过去对反应机理的判别较多地是采用热重分析的相关系数一步判别法,由于热重分析的相关系数大都比较接近,因此仅靠这种单一的方法,很难作出准确判断.如果将等温热重分析的相关系数判别法、非等温与等温热重分析的动力学参数判别法和反应速率常数的对比判别法三者结合起来,则可以大大地提高判断的准确度.本文以一水合草酸钙为例,表明这种相关判别法的适用性.
At present, it is a very active research field to study the thermal decomposition reaction kinetics by thermal analysis technology, however, the kinetic parameters published by different researchers often have very different reasons, of course, the reasons are many, most The main reason is that there is no reliable method to judge the correct decomposition reaction mechanism.During the past, the discrimination of reaction mechanism is mostly the one-step discriminant method using the correlation coefficient of thermogravimetric analysis. Since the correlation coefficients of thermogravimetric analysis are mostly close, By this single method, it is difficult to make an accurate judgment.If the isothermal thermogravimetric analysis of the correlation coefficient discriminant method, non-isothermal and isothermal thermogravimetric analysis of kinetic parameters and reaction rate constants of the contrast determination of three Combined, can greatly improve the accuracy of the judgment.In this paper, calcium oxalate monohydrate as an example, indicating the relevance of this discriminant method.