聚酰亚胺/ Al2O3掺杂薄膜热老化寿命计算方法研究

利用热失重仪(TG)测定了Al2O3掺杂聚酰亚胺的热稳定性,采用Kissinger法和Coats-Redfern法计算动力学参数,预测杂化薄膜长期使用的上限温度.实验结果表明:在空气气氛中的反应级数大于氮气气氛中的反应级数,且趋于二级反应.利用Kissinger法求出的E值低于Coats-Redfern法求出的E值,选取Coats-Redfern法求取相应的碰撞系数(A)值后,预测杂化PI膜长期使用的上限温度在300℃左右,与文献报道基本相符.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。

Calculation Method for the Thermal Aging of Polyimide / Al2O3 Hybrid Films

The thermal stabilization of PI / Al2O3 hybrid films was studied with TG.Meanwhile,the kinetics parameters(activation energy of thermal decomposition,collision coefficient and action progression) were calculated,and the upper limit temperature was predicted according to the relevant data.The experiment results showed that the order of reaction in air atmosphere was bigger than that in nitrogen atmosphere,and tended to second-order reaction.The value of E calculated by the method of Kissinger was lower than that in the method of Coats-Red fern.The collide coefficient(A) was calculated in the method of Coats-Red fern selected by contrast,and the upper limit temperatures of hybrid PI material was nearly 300 ℃ similar to those reported in previous literatures.The results have shown that Coats-Red fern method is one of the reliable methods to predict the long-term life upper limit temperature of hybrid PI materials.