Abstract. Melt spinnable silicone resin with a low carbon content was spun to fiber form with an averaged diameter of 16.8 µm. When the resin fiber was cured by SiCl 4 vapor and pyrolyzed at 1273K in inert atmosphere, Si-O-C fiber with smooth surface was obtained. The measured tensile strength was relatively low. The fiber, however, showed oxidation resistance during high temperature exposure under an air flow. When the fiber was cured by TiCl 4 with an increased vapor pressure at 313K, 40% mass gain was observed after the curing. SiO 2 -TiO 2 fiber was obtained by pyrolysis in an air flow, while SiOC-TiO 2 fiber was obtained by pyrolysis in an inert atmosphere. Structure of TiO 2 and the resulting fiber surface morphology strongly depended on the temperature and the atmosphere during the pyrolysis.

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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.