Isothermal and non-isothermal pyrolysis kinetics of Kapton® polyimide
Isothermal and non-isothermal pyrolysis kinetics of Kapton® polyimide
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DOI：
10.1016/j.polymdegradstab.2005.04.021
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发表时间：
2006-01-01
影响因子：
5.9
通讯作者：
Su, JC
中科院分区：
文献类型：
--
作者：
Lua, AC;Su, JC
采用等温和非等温热重数据拟合技术，研究了Kapton（R）聚酰亚胺100 HN在氮气气氛下的热分解动力学。反应机理拟合，分析模型拟合和isoconversional方法，这些数据的相关性进行了检查的动力学参数和动力学预测。固态反应的机制非常适合的等温数据，但结果在高度不确定的值的动力学参数时，适用于非等温数据。等转化率法表明，表观活化能取决于转化程度，但不提供反应级数和指前因子的信息。利用非等温数据对Coats-Redfern、MacCallum-Tanner和货车Krevelen提出的三种单一升温速率分析模型进行了分析。提出了一种多加热速率模型，并在动力学预测的基础上将其有效性与单加热速率模型进行了比较。(c)2005 Elsevier Ltd.保留所有权利。
The kinetics involved in the thermal decomposition of Kapton((R)) polyimide 100HN under nitrogen atmosphere were studied by applying various fitting techniques to the isothermal and non-isothermal gravimetric data. The correlation of the reaction mechanism fitting, the analytical model fitting and the isoconversional method to these data was examined in relation to the kinetic parameters and the kinetic predictions. The mechanisms for solid-state reactions fit the isothermal data very well but result in highly uncertain values for the kinetic parameters when applied to the non-isothermal data. Isoconversional methods show that the apparent activation energy depends on the extent of conversion but do not provide information for the reaction order and the pre-exponential factor. Three single heating-rate analytical models by Coats-Redfern, MacCallum-Tanner and van Krevelen were analysed using the non-isothermal data. A multi-heating rate model is proposed and its validity is compared to the single-heating rate models on the basis of kinetic predictions. (c) 2005 Elsevier Ltd. All rights reserved.