Study Structural and Optical properties of PVA films at different thickness

Abstract

Polyvinyl alcohol (PVA) films with different thicknesses were prepared
by casting method. The thickness of the prepared films were (35, 55, 75 and
100) μm. The optical transmission (T%) was measured in the wavelength rang
of (200 – 1100)nm, The effect of thickness increasing on optical properties
such as transmittance, refractive index, extinction coefficient in addition of the
Real and Imaginary part of dielectric constant was studied. This study reveals
that all these parameters affected by the increasing of the thickness, and also
found that the optical energy gap has been increased with the increasing of the
thickness.