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Electronic structure of poly(p‐phenylene sulfide)
Author(s) -
Tanabe Yoshikazu,
Shimizu Hiroshi
Publication year - 1991
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760311006
Subject(s) - materials science , photoconductivity , conductivity , photocurrent , absorption spectroscopy , doping , bipolaron , phenylene , sulfide , analytical chemistry (journal) , charge carrier , absorption (acoustics) , polaron , optoelectronics , chemistry , electron , optics , physics , polymer , chromatography , quantum mechanics , metallurgy , composite material
The electronic structure of poly(p‐phenylene sulfide) (PPS) was studied through steady state photocurrent spectra and temperature dependence of dark conductivity for undoped film, by changes in the in situ optical absorption and ESR spectra under photoirradiation, and optical absorption spectra for doped film. The charge carriers in the undoped state are electronic since the photoconductivity is large and the kink point in the temperature dependence of dark conductivity is higher than the glass transition temperature. A sharp peak near the absorption edge in the photocurrent spectrum of undoped PPS is caused by the diffusion of photocarriers in a sheet with high surface recombination under conditions of low applied field. The in situ optical absorption and ESR spectra of SO 3 ‐doped PPS were similar to those of di‐p‐tolyl sulfide (a monomer unit of PPS) and the formation of sulfur‐centered radical cations was suggested rather than bipolaron states. The stable conduction of SO 3 ‐doped PPS after exposure to atmosphere was analyzed by the classical Lorentz model and the existence of nearly free carriers within subchains was suggested. Their conductivity and mobility were estimated to be 2 S/cm and 3.6 cm 2 /Vs, respectively. Inter‐chain conduction appears to be very low.