摘要
Polyimide-silica (PI-SiO 2 ) hybrids with a nanostructure was obtained using the nonaqueous sol-gel process by polycondensation of phenyltriethoxysilane in a polyamic acid solution. Self-catalyzed hydrolysis of phenyl-substituted akoxysilane and modification on the polyimide structure are applied and result in highly compatible PI-SiO 2 hybrids. Transparent PI-SiO 2 with a high silica content of about 45% was thus obtained. The prepared PI-SiO 2 films were characterized by infrared spectrometry, 29 Si-NMR, thermogravimetric analysis, differential scanning calorimetry, and scanning electron microscopy. These characterizations showed the silica influence on the properties of the hybrid. The thermal expansion coefficient of the PI-SiO 2 and the temperature correlation were also established for probing the potential for application.