Effect of Mixing on the Optical Parameters of Polymer Blend (PMMA:PVC:PS) Thin Films

International Conference on Materials Engineering and Science

Sabbar, Ali N.^1 ; Azeez, Bashar H.^1 ; Talib, Karar M.^2

Department of Physics, College of Science, Al-Muthanna University, Iraq^1

College of Dentistry, Al-Muthanna University, Iraq^2

关键词: Absorption and reflection spectrum;    Energy gap values;    Extinction coefficients;    MATLAB program;    Optical energy gap;    Optical parameter;    Pressure and temperature;    Short wavelengths;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/454/1/012129/pdf
DOI  :  10.1088/1757-899X/454/1/012129

来源: IOP

【 摘 要 】

The thin films have been prepared using casting method at normal weather conditions of pressure and temperature. The films treated thermally for three hours at 45 °C. The UV-VIS double beam technique used to determine absorption and reflection spectrum. The thickness of the prepared thin films is measured using a handheld gauge of coating thickness measurement. Excel and MATLAB program used to calculate and simulate parameters and figures. The optical properties of PMMA:PVC:PS mixtures have been investigated. There is a clear change in the optical parameters due to mixing ratio. The result shows the indirect energy gap values reduced from 1.58 to 1.9 electron-volts. Mix a ratio of PMMA, PVC & PS leads to enhance some of the optical parameters like optical energy gap, absorbance, extinction coefficient and optical conductivity. The four kinds of thin films have different properties: The polymer blend (50%PMMA:25%PVC:25%PS) has the smallest values of the energy gap and linear refractive index, and the highest extinction coefficient values. The polymer blend (25%PMMA:25%PVC:50%PS) has a small value of energy gap and the best optical conductivity. The polymer blend (25%PMMA:50%PVC:25%PS) has the highest Urbach energy and absorption for the short wavelength (370 to 620 nm). The polymer blend (50%PVC:50%PS) has a good reflection, linear refractive index and skin depth, but it has the lowest values of extinction coefficient and optical conductivity.