Thermal degradation kinetics of poly-alpha-methylstyrene
-
摘要: 利用热分析技术(TG/DTG)对聚--甲基苯乙烯(PAMS)在氮气气氛下以不同升温速率为条件进行热降解动力学研究。研究结果表明：PAMS的热降解步骤为一步反应，在升温速率为10 ℃/min时，主要失重温度区间为302～343 ℃，热失重速率最大时温度为325 ℃。在同一温度下，随着升温速率的不断提高，主要降解温度向高温区移动。采用了Kissinger，Flynn-Wall-Ozawa及Coats-Redfern方法研究其动力学参数，确定了PAMS的降解活化能在160～220 kJ/mol之间、反应级数为一级。Abstract: Thermogravimetric analysis was performed to obtain thermal degradation kinetics of poly-alpha-methylstyrene(PAMS) at different heating rates in nitrogen. Several conclusions can be obtained from the experimental. Firstly, the degradation of PAMS is a one step reaction. Secondly, when the heating rate is 10 ℃/min , the main degradation temperature ranges from 302.79 ℃ to 343.10 ℃, and maximum thermal weight loss rate temperature is 325.85 ℃. The main degradation temperature ranges tend to higher temperature with increasing of heating rate. The kinetic parameters of thermal decomposition of PAMS were calculated using Kissinger method, Flynn-Wall-Ozawa method, and Coats-Redfern method.
-
点击查看大图
计量
- 文章访问数: 1758
- HTML全文浏览量: 271
- PDF下载量: 319
- 被引次数: 0
下载:
