A series of perylene-containing polyimides and copolyimides have been synthesized and characterized by DSC, TGA, NMR, UV−vis, and X-ray powder diffraction measurements. Xerographic electrical measurements indicated that perfectly alternating copolyimides had higher photosensitivities than those of homopolyimides and random copolyimide. After annealing, polyimide films showed a red-shift in UV−vis absorption and improved photosensitivity due to an increase in crystallinity, as indicated by wide-angle X-ray diffraction measurements.
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Wang et al. (1998) studied this question.
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