Abstract
A series of polyimide copolymers based on pyromellitic dianhydride, oxydianiline (ODA) and terta(4-aminophenyl)porphyrin were synthesized. The ‘precursors’, copolyamic acids and the copolyimides, were characterised by UV–visible spectra, IR spectra and thermogravimetry. The mole ratios of tetraphenylporphyrin (TPP) to diphenylether in the polymers calculated from the UV–visible spectra indicate that TPP and ODA were incorporated into the polymer backbones as expected. To investigate the photoconductivity of the copolyimides (CPIs), three and four-layered photoreceptors containing the CPI films as charge-generating layers were fabricated. It was found that the photosensitivity of the CPIs increased with the incorporation of TPP into the polymer chains. These results were compared with those of tetraphenyl-porphyrin doped pyromellitic/oxydianiline (PMDA/ODA) polyimide and explained on the basis of the formation of charge-transfer complexes.
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