【摘要】 以热分析法（ＴＧ、ＤＴＧ）为手段，对固态物质（聚丙烯（ＰＰ））在不同升温速率（５，１０，１５，２０℃／ｍｉｎ）下的热降解动力学进行了研究。用Ｓｅｓｔａｋ复杂机制进行非线性拟合处理，得到了聚丙烯降解反应在不同升温速率及不同转化率α下的活化能Ｅ、指前因子Ａ等动力学参数，参数的稳定性和重复性皆较好。活化能Ｅ＝１０５．４０±０．５ｋＪ／ｍｏｌ，与文献值相符，与反应机制有关的动力学参数ｍ、ｎ和ｐ分别为６．２１２８、７．６８１９和８．０２３８。还讨论了Ｓｅｓｔａｋ复杂机制在求解动力学参数中的优点更多还原

【Abstract】 The thermal decomposition of solid (polypropylene) was studied by using the thermal gravimetric analysis (TG, DTG), at heating rates of 5, 10, 15, 20 ℃/min at the fluid of N 2. The Sestak′s complex mechanism was used to do curve fitting, the computable results of kinetics of activation energy E and preexponential A have a good stabilities and repeatabilities. The parameters of kinetics have been calculated, the activation energy E =105.40±0.5 kJ/mol, which accords with the literature. The exponential function parameters m, n and P , which reflect the reaction mechanisms, were obtained as 6.2128, 7.6819 and 8.0238, respectively. The superiority of the Sestak′s mechanism to describe the PP′s degradation was also discussed.更多还原