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- 2018
苊的结晶动力学研究
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Abstract:
以纯度分别为99.48% 和97.83% 的苊为样品1和样品2, 运用差示扫描量热法(DSC)研究了苊的非等温结晶动力学的行为, 并采用Avrami法、Ozawa法以及Kissinger法对数据进行动力学分析．在Avrami模型分析中, ln[?ln(1? Xc)]与lnt线性度良好, 且结晶速率常数Kc随着降温速率β的增大而呈下降趋势, 这说明降温速率变快后结晶不完善, 晶核形成不完全．在Ozawa模型分析中, m及KT对温度有一定的依赖性, 且在一定范围内ln[?ln(1? Xc)]与lnβ的线性度较好, 随温度的降低, m值逐渐上升, 这说明在低温情况下结晶速率提高, 有利于结晶．研究表明, 此2种模型均能较好地描述苊的结晶动力学过程．Kissinger方程求得苊的非等温结晶活化能为-121.6 kJ/mol.
Acenaphthenes with purity of 99.48% and 97.83% were named as sample 1 and sample 2, respectively. Non-isothermal crystallization kinetics behavior of acenaphthene was studied by differential scanning calorimetry(DSC). In addition，Avrami，Ozawa and Kissinger methods were used to analyze the data of DSC. In the analysis of Avrami model，it is found that the linearity of ln[-ln(1－Xc)]with lnt is good and the crystallization rate constant Kc decreases with the increase of cooling rate β，which shows that the crystallization is not perfect and the nucleation is incomplete at a faster cooling rate. In the Ozawa model analysis，it’s found that m and KT are dependent on temperature，and the linearity of ln[-ln(1－Xc)]with lnβ is good within a certain range. As the temperature decreases，m gradually increases. It indicates that the crystallization rate increases at a low temperature，which is beneficial to crystallization. The results show that these two models discussed above can describe the crystallization kinetics of non-isothermal and isothermal processes well. The activation energy obtained by Kissinger equation for non-isothermal crystallization of acenaphthene is -121.6 kJ/mol
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