Study the optical characteristics of polystyrene polymer before and after doping with methyl orange

In this study, effect of incorporation different percentages of methyl orange (MO) (0%,10% and 20%) with polystyrene (PS)substance were investigated. The optical characteristics of the prepared specimens were studied in term of absorbance spectrum for wave lengths of (300-1100 nm) before and after doping process, using UV-Visible Spectrophotometer device. The study results included calculations of the following properties: absorbance and extinction coefficient, refractive index, real and imaginary parts of dielectric constant and optical gap energy coefficients of allowed and forbidden indirect transition. Further, results show that each of absorbance property, refraction property, absorbance coefficient, extinction property, and real and imaginary insulation constant increasing proportionally with increasing of (MO) concentration. While the values of Transmittance and optical gap energy of allowed and forbidden indirect transition properties have an inverse relationship, where the values of these properties were decreased with increasing of (MO) concentration.