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The photoelectric characteristics and paramagnetic properties of newly synthesized polyimides (PI) have been investigated using the electrophotographic method and an ESR signal study. The polyimides based on N,N,N',N'-substituted p-phenylenediamine and dianhydrides, were prepared via polycondensation. The polymers exhibit excellent solubility in common organic solvents, and have high thermal stability. The PI films exhibit photoelectric sensitivity in the UV, and visible spectral regions. The mechanism of photogeneration has been investigated. Paramagnetism of the air stored PI samples has been determined by the air oxidized PI donor fragments (stable radicals). PI ESR spectra in a solid state and solution have been investigated as well as the effect of light excitation on those spectra.

Photoelectron Properties and Paramagnetism of Polyimides Based on N,N,N’,N’-substituted p-Phenilenediamine and Dianhydrides