OPTICAL AND ELECTRICAL-PROPERTIES OF A NEW POLYMER

Thin film of lo-1,4-vinylene-2,3-dicarboxylicacidamide-s-methyl hydraz inecarbodithioate) (II) (Scheme 1) of 5 mu m thickness was prepared. T he dielectric properties of the prepared sample were studied as a func tion of frequency and temperature, and the results were analyzed by th e Cole-Cole method. The optical permittivity and the de-conductivity h ave been deduced, and the activation energy has been calculated and fo und to be 0.023 eV. Also, a detailed study of optical absorption is pr esented. The optical absorption spectra were measured in the wavelengt h range from 200-600 nm. The calculated absorption coefficient, absorp tion index, and determined values of energy gaps (E-opt(d), E-opt(i) a nd Delta E) are presented. The results indicate that both mechanisms o f direct and indirect transitions exist. (C) 1997 John Wiley & Sons, I nc.