Melt spinning process of polymethylsilsesquioxane (PMSQ) at 403-453 K was investigated as a SiAOAC fiber precursor in terms of averages and distributions of spun fiber diameters. Because of fusible character of PMSQ at low temperature, the spun fibers were exposed to vapors of various metal chlorides (SiCl 4 , Si(CH 3 )Cl 3 , TiCl 4 , and BCl 3 ) to promote the fiber curing. Cured fibers were investigated by FTIR and TG analyses.In a case of the fiber synthesized with SiCl 4 curing, tensile tests on the pyrolyzed fibers were performed. Exposure of the synthesized fiber at high temperature with a flame of an oxygen-gas burner was examined.

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Polymethylsilsesquioxane (PMSQ) fiber was exposed to metal chloride vapors in a controlled atmosphere or electron beam irradiation in air to promote the curing process. The cured fibers were pyrolyzed at 1273K to compare the efficiency of individual curing method. The cured fibers were investigated by FT-IR, an optical microscope and TG analysis. In the case of successful curing, averaged diameter and tensile strength were analyzed on the obtained Si-O-C fibers.

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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