功能性聚酰亚胺薄膜的研制

Preparation of Nano-Sized Al_2O_3/Polyimide Hybrid Films

通过原位聚合法,将纳米粒子A l2O3引入聚酰亚胺基体中,制备了具有不同A l2O3含量的A l2O3/PI杂化薄膜。研究结果表明:当A l2O3的质量分数小于10%时,杂化薄膜的拉伸强度和电击穿强度与纯薄膜相当;当A l2O3的质量分数为10%时,杂化薄膜的电老化寿命是纯薄膜的3.4倍,失重5%的温度比纯薄膜提高了42℃;随着A l2O3质量分数的增加,杂化薄膜的线膨胀系数呈下降趋势。

As the Al2O3 is less than 10% ,the mechanical properties and dielectric strength are the same for the pure and hybrid films. The hybrid film with 10wt% of Al2O3 exhibits a significant enhancement in electrical aging time and decomposition temperature at 5% weight loss,which are 3.4 times longer and 42℃ higher than that of pure PI film. It is revealed that the a of the PI hybrid films decreases gradually with increasing of Al2O3 content.