Effect of MnCl2 Additive on Optical and Dispersion Parameters of Poly methyl Methacrylate Films

Abstract

PMMA films with various content of MnCl₂ additive (1, 3%) are prepared by casting method. Amorphous films of PMMA-Mn are examined using X-ray diffraction (XRD). UV-Visible spectrophotometer is used to record the transmittance spectra, which decreased with the increasing of MnCl₂. Energy gap value decreased from 3.91 eV for PMMA to 3.39 eV for film with 3% additive of MnCl₂, while the Urbach energy are increased from 555 meV to 741 meV for the same additives. Dispersion parameters are determined using Wemple and DiDomenico model. The E_d, E_o, and So increased with the increasing of MnCl₂ additive, while n (0), λ_o, and M_-1, M_-3 are decreased.

Keywords: PMMA, Dispersion parameters, Composite, Optical properties.