以TEOS为无机前躯体,采用溶胶-凝胶路线成功制备了水含量不同的3种聚酰亚胺/二氧化硅(PI/SiO2)纳米杂化薄膜。采用傅立叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)、热重分析(TGA)等方法研究了杂化薄膜的结构与热稳定性。研究结果表明:水含量对PI/SiO2杂化薄膜热稳定性影响很大。在水含量不同的3种杂化薄膜中,当水含量为1∶6时,热稳定性最高。在质量损失为5%时,杂化薄膜的热分解温度为592.1℃。与纯PI相比,热稳定性升高。 Three types of polyimide / silica (PI / SiO2) hybrid films with different water contents were successfully prepared by sol-gel route using TEOS as an inorganic precursor. The structure and thermal stability of the hybrid films were investigated by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). The results show that water content greatly affects the thermal stability of PI / SiO2 hybrid films. Among the three kinds of hybrid films with different water contents, the thermal stability was the highest when the water content was 1: 6. When the mass loss is 5%, the thermal decomposition temperature of hybrid film is 592.1 ℃. Compared with pure PI, thermal stability increased.