Pre-tilt angles as a function of polyimide composition for copolyimides

Abstract

Six series of copolyimides have been synthesized. The pre-tilt angle has been measured as a function of the composition of these copolyimides. A linear relationship was found between the pre-tilt angle and the composition when both the simple polyimides are amorphous. When one or more of the simple polyimides is semi-crystalline there is normally a strong deviation from linearity. The copolyimides will then usually give pre-tilt angles lower than expected from an average of these for the two simple polyimides.