Synthesis and properties of photoconductive and photorefractive organic polymeric materials

Abstract

Xerographic photoconductivity of 3,5-dinitrobenzoates of poly[1-(pmethoxyphenyl)penta-1,3-diyn-5-ol], poly [1 -(2-methoxyphenyl)penta- 1,3- di yn -5 - ol] and poly[1-(p N,N-dimethylaminophenyl)penta-1,3-diyn-5-ol] [DN-1,2-PMDO, DN-1,4-PMDO and DN-1,4-PDDO] is dependent on the electron donating side chains. From the transient photoconductivity signal on a sub-nanosecond time scale, a plausible mechanism for the charge carrier generation and charge transporting properties of these polymers is proposed. Condensation of photoconducting dialdehydes and nonlinear optical diamine derivatives gave new polyazomethines, Cbzl-Azo, Tpa-Azo and Dpa-Azo which have a good solubility in organic solvents. The polymer having carbazole, arylamine moieties and azo type nonlinear optical chromophore in the polymer backbone showed high photoconductivity and nonlinear optical property. The photorefractive composites fabricated by blending NLO chromophores such as {4-[2-(4-nitrophenyl)-vinyl]-phenyl}-diphenylamine (NVPDA), 3-(4-{bis-[4-(2-ethylhexyloxy)-phenyl]-amino}-phenyl)-2-isocyano-acrylonitrile (PAIA) and bis-[4-(2-ethyl-hexyloxy)-phenyl]-{4-[2-(4-nitrophenyl)-vinyl]-phenyl}-amine (PNPA) with photoconducting crosslinkable matrix, bis-(4-ethynylphenyl)-(4-octyloxyphenyl)-amine (BEOPEA), showed high photorefractive property and many problems faced in typical organic photorefractive systems such as time-consuming chemical synthesis, difficulty in rational design, intrinsic instability and phase separation could be avoided.