Optical and electrical properties of a new polymer

Abstract

Thin film of poly (5-isopropylidenecyclo-1,4-vinylene-2,3-dicarboxylicacidamide-s-methyl hydrazinecarbodithioate) (II) (Scheme 1) of 5 ?m thickness was prepared. The dielectric properties of the prepared sample were studied as a function of frequency and temperature, and the results were analyzed by the Cole�Cole method. The optical permittivity and the dc-conductivity have been deduced, and the activation energy has been calculated and found to be 0.023 eV. Also, a detailed study of optical absorption is presented. The optical absorption spectra were measured in the wavelength range from 200�600 nm. The calculated absorption coefficient, absorption index, and determined values of energy gaps ($E^d_{\hbox{opt}}, E^i_{\hbox{opt}}$ and ?E) are presented. The results indicate that both mechanisms of direct and indirect transitions exist.