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采用双外推法确定了丁香油-β-环糊精(CD)包合物中残存态β-CD最可能的热分解机制.基于Flynn-Wall-Ozawa方法对残存态β-CD热分解反应过程的计算结果发现,活化能(Ea)变化曲线可划分为三个阶段.第一和第三阶段的曲线轮廓近似平行,并且都被推定为按照Avrami-Erofe′evA1.5模型发生热分解反应.但是在曲线的第二阶段,出现了一个Ea值近似相等的平台.为此,采用确定反应级数的方法考察了该阶段的热分解过程.研究表明,反应级数随着温度升高呈现规律性的降低,表明在这个阶段残存态β-CD分解反应的复杂性.最后,比较了游离态β-CD和残存态β-CD在分解过程中红外光谱的变化情况.结果显示,它们在1000cm-1以下的谱图轮廓存在明显差异,这与计算给出的二者具有不同Ea值的结果是一致的.
Double extrapolation method was used to determine the most likely mechanism of pyrolysis of residual β-CD in clove oil-β-cyclodextrin (CD) inclusion complex.According to the Flynn-Wall-Ozawa method, the residual β-CD thermal decomposition The calculation of the process found that the curve of activation energy (Ea) can be divided into three phases, the first and the third phase curves are approximately parallel, and both are presumed to be pyrolyzed according to the Avrami-Erofe’evA1.5 model However, in the second stage of the curve, a plateau with similar Ea values appeared.For this reason, the thermal decomposition process of this stage was investigated by determining the reaction order.The results show that the reaction order appears as the temperature rises The decrease of regularity indicates the complexity of the residual β-CD decomposition reaction at this stage.Finally, the changes of the IR spectra of the free β-CD and the residual β-CD during the decomposition are compared.The results show that they are stable at 1000cm There is a clear difference in the spectral profiles below -1, which is consistent with the calculated Ea values for both.