Preparation and properties of Ti(OC4H9)4-GPTMS-MMA derived titania-silica sol-gel optical coatings

Abstract

Sol-gel processing of acid-catalyzed tetrabutoxytitanate, 3- glycidyl propyl trimethoxisilane and monomeric methyl methacrylate to produce titania-silica sol-gel optical coatings and matrix materials has been systematically studied. The coatings were deposited by dip-coating technique on glass substrates from a polymeric solutions, pseudo-ternary phase diagram were used to outline the regions of stability of the Ti(OC4H9)4-C2H5OH-H2O-HAC and Ti(OC4H9)4-GPTMS-C2H5OH-H2O-HAC system respectively. It was found that the stability of the system depend on the compositions, especially the molar ratio of [H2O]/[Ti(OC4H9)4]. The use of GPTMS allows a thicker coatings than is possible with the sol- gel films prepared from non-organically modified alkoxides.