Synthesis of SiO2-TiO2 fibers with photocatalytic activity by TiCl4 vapor curing on melt-spun silicone resin fiber

Abstract

Melt spun silicone resin fiber with a diameter of 14 µm was exposed to TiCl 4 vapor with flowing nitrogen at room temperature or 40°C. During the exposure, TiCl 4 was incorporated in the resin network with formation of cross-links. After standing in ambience for 24 h and pyrolysis in an air flow, SiO 2 TiO 2 fibers were obtained in a yield of 7580%. Ti/Si content can be controlled by adjusting the curing time and temperature. TiO 2 existed as nano particles or aggregated large particles, which were strongly attached on the fiber body. Analysis of 2-propanol degradation by the fiber under UV light suggested the existence of photocatalytic activity.