A comparison study on thermal decomposition behavior of polylactide with different kinetic models
A comparison study on thermal decomposition behavior of polylactide with different kinetic models
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DOI：
10.1007/s10973-014-4311-4
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发表时间：
2015-03-01
影响因子：
4.4
通讯作者：
Teng, Li-jun
中科院分区：
文献类型：
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作者：
Huang, Zhen;Ye, Qiao-qiao;Teng, Li-jun
通过热重分析（TG）和差热分析（DTA）研究了聚乳酸在氮气气氛下的热行为。实验数据是在2.5 ~ 30 Kmin（-1）的升温速率下，从室温到750 K的温度范围内收集的。从所得的TG和DTA曲线获得热特征。结果表明，热分解主要发生在550-660 K之间。动力学分析的质量损失与温度的数据已经进行了四个不同的温度积分模型，包括分布活化能模型（DAEM），Flynn-Wall-Ozawa，Coats-Redfern，和唐模型。通过DAEM模型，得到了活化能分布函数以及活化能与指前因子的关系。在不同的转化率水平下，得到的活化能范围为91.34 ~ 107.44 kJ mol（-1），使用其他三种模型也得到了类似的结果。利用这些动力学参数，在假定一级反应机理的情况下，用上述四种模型对热重曲线进行了模拟，得到了满意的模拟结果。
A thermal study of poly(l-lactide) under nitrogen atmosphere has been carried out through thermogravimetric (TG) analysis and differential thermal analysis (DTA) measurements. The experimental data were collected with the heating rates of 2.5 to 30 K min(-1) and from ambient temperature up to 750 K. The thermal features were obtained from resultant TG and DTA curves. The results show that the thermal decomposition was mainly in the temperature range of 550-660 K. Kinetic analyses of the mass loss versus temperature data have been performed with four different temperature integral models, including the distributed activation energy model (DAEM), Flynn-Wall-Ozawa, Coats-Redfern, and Tang models. Through the DAEM model, the activation energy distribution function and the relationship between activation energy and pre-exponential factor have been obtained. The activation energy thus obtained at different conversion levels ranges from 91.34 to 107.44 kJ mol(-1), and similar results have been produced using the other three models. With these kinetic parameters, the TG curves have been simulated with the above four models by assuming the first-order reaction mechanism, resulting in satisfactory simulation results.