氟醚橡胶热分解规律及动力学研究
Characteristics and kinetics of thermal degradation of fluoroether rubber
作者：何利万(四川大学高分子研究所高分子材料工程国家重点实验室)；皮红(四川大学高分子研究所高分子材料工程国家重点实验室)；丁祖群(成都飞机工业集团有限公司)；侯平安(成都飞机工业集团有限公司)
Author：HE Li-Wan(Polymer Research Institute, State Key Laboratory of Polymer Materials Engineering, Sichuan University)；PI Hong(Polymer Research Institute, State Key Laboratory of Polymer Materials Engineering, Sichuan University)；DING Zhu-Qun(Chengdu Aircraft Industry Corporation)；HOU Ping-An(Chengdu Aircraft Industry Corporation)
收稿日期：2014-06-26 年卷（期）页码：2015,52(1):134-138
期刊名称：四川大学学报: 自然科学版
Journal Name：Journal of Sichuan University (Natural Science Edition)
关键字：氟醚橡胶; 热失重分析; 热分解; 动力学
Key words：Fluoroether Rubber; TGA; Thermal Degradation; Kinetics
基金项目：
中文摘要
用热失重分析方法(TGA), 研究了氟醚橡胶在氮气中的热分解规律, 并探讨了不同升温条件和不同失重阶段氟醚橡胶的热分解动力学.研究结果表明: 在氮气中, 氟醚橡胶的热分解过程可分为两个阶段; 不同升温速率下其热分解反应机理相同; 升温速率越大, 氟醚橡胶的分解温度越高.应用等转化率法(Friedman微分法), 在不假设反应机理函数的情况下, 分析了氟醚橡胶热分解在不同转化率时的活化能, 其平均值为241.4 kJ/mol; 同时用Coats Redfern法分析得出氟醚橡胶在不同升温速率时的热分解动力学参数基本相同.结合两种分析方法提出: 氟醚橡胶在氮气中的热分解活化能E为244.3 kJ/mol, 最理想的热分解反应机理函数为幂函数法则, 其积分形式为g(α)=α3/2.
英文摘要
The thermal decomposition characteristics and kinetics of fluoroether rubber were studied by thermogravimetric technique under pure nitrogen atmosphere. The results suggest that all samples with heating rate from 5K/min to 20K/min show a similar characteristic in their TGA curves, two steps take place in their decomposition processes. And as the heating rate increasing, the degradation temperature of the sample moves to be higher. The method of equal conversion rate (Friedman method) was used to determinate the apparent activity energy at different conversion rates, it is found that the average value of the activity energy is 241.4 kJ/mol. Coats Redfern method was used to discuss the probable degradation mechanism at different heating rate, it indicates that the thermal degradation mechanism of fluoroether rubber at different heating rates is the same. Combining the two methods, it can be concluded that the most reasonable thermal degradation mechanism of fluoroether rubber is Mampel power law: g (α) =α3/2, and the apparent activity energy is 244.3 kJ/mol.
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