摘要
通过热重分析(TG)方法研究了Al2O3掺杂聚酰亚胺(PI)的热稳定性。结果表明,Al2O3质量分数为8%的PI的热稳定性要优于Al2O3质量分数为4%的PI。利用Coats_Redfern方法计算分解动力学参数,求得Al2O3质量分数为4%和8%的掺杂PI在氮气及空气氛围下的热分解活化能(E)分别为91.18 kJ/mol、86.83kJ/mol1、05.53 kJ/mol和100.88 kJ/mol。同时计算出相应的碰撞系数(A)值,以及反应级数(n)值,最后估算出其长期使用的上限温度,依次为193.08℃、191.00℃、217.11℃和212.83℃。结果表明,Coats_Redfern方法是预测杂化PI材料长期使用上限温度的可靠方法之一。
The thermal stabilization of PI/Al2O3 hybrid films was studied by TG.The results showthat the thermal stabilization of PI with 8% mass fraction Al2O3 is better than that of PI with 4%mass fraction Al2O3.The kinetic parameters of thermal decomposition（thermal degradation activation energy,collision coefficient and reaction order） of PI with 4% and 8% mass fraction Al2O3 in N2 and air were calculated with the Coats-Redfern method.And the thermal degradation activation energy（E） was 91.18 kJ/mol,86.83 kJ/mol,105.53 kJ/mol and 100.88 kJ/mol,respectively.The corresponding collision coefficient（A） and reaction order（n） were obtained at the same time.At last,the ceiling temperature for long-term use was calculated,i.e.193.08 ℃,191.00 ℃,217.11 ℃and 212.83 ℃.The results indicate that the Coats-Redfern method is a reliable technique for forecasting the ceiling temperature of PI hybrid materials in long-term use.
出处
《绝缘材料》
CAS
北大核心
2009年第6期41-42,46,共3页
Insulating Materials
