Identification of the Optical Properties of Low-Density Polyethylene

Abstract

In this work, low density polyethylene (LDPE) films were prepared with different thicknesses from (0.14, 0.15, 0.16, 0.18)x10-2mm.The optical properties such as absorbance, transmittance, and reflectance were studied in order to find out coefficient of absorption, extinction coefficient, and refractive index for all films. The results showed that the absorption increased by increasing the thickness of the films. The absorption coefficients were found to be equal to (2.511, 2.548, 2.410, 2.142) respectively and extinction coefficients were found to be equal to (126.5, 128.37, 121.42, 107.91) rerespectively. Then films have transmittance about (T=70.3-67.5%) in visible region .The refractive index were found to be equal (3.3, 3.5, 3.6, 3.6) respectively and reflectance (R=29.7-32.5%) at wavelength (632.8nm). Also the energy gaps (Eg) were found to be equal to ( Eg=3.969, 4.0, 4.02, 4.03)ev respectively all LDPE samples