Optical properties of epoxy-glass microballoons composite

Abstract The optical properties in the uv-visible region of epoxy glass composite containing 0, 15, 35 and 55% by weight glass microballoons are reported. The obtained optical data are analysed in terms of absorption formula for non-crystalline materials. Assuming that non-direct transitions in the k -space are involved values of optical band gap ( E opt ) were determined. From the Urbach edges, the width of the tail of localized states in the band gap ( E ) were evaluated at room temperature.