Electrophotographic and structural studies on novel photoconductive polyimide films
作者:
Akio Takimoto,
Hirofumi Wakemoto,
Hisahito Ogawa,
期刊:
Journal of Applied Physics
(AIP Available online 1991)
卷期:
Volume 70,
issue 5
页码: 2799-2805
ISSN:0021-8979
年代: 1991
DOI:10.1063/1.349342
出版商: AIP
数据来源: AIP
摘要:
Novel photoconductive polyimides have been developed, whose monomer units are composed of a series of thiophenylene moieties, ‐C6H4S‐, and imide groups. The most photosensitive polyimide shows an excellent photosensitivity of less than 1.0 &mgr;J/cm2in the visible light region, 400–570 nm. These photosensitive polyimide films are prepared by polymerizing the cast prepolymer films and annealing at the melting points of the polyimides. In this process their photosensitivities remarkably increase with the increase of crystallinity. From the structural studies by ultraviolet visible absorption, x‐ray diffraction, infrared absorption, and x‐ray photoelectron spectroscopy measurements, it is proposed that the coplanary conformation takes place in the crystallizing. The overlapped &pgr; orbitals, perpendicular to the polymer chains, lead to the more expanded conjugate system.
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