SYNTHESIS OF FIBROUS SHAPE CERAMICS FROM BLENDED PRECURSORS OF ORGANOSILICON POLYMERS CONTAINING POLYMETHYLSILANE

Viscous solutions of polymethylsilane (PMS) and polycarbosilane (PCS) mixed at various ratios were prepared and shaped into fiber farm by th e dry-spinning method using benzene as solvent. The addition of PMS to PCS lowered onset temperature of the precursor fiber oxidation, and s lightly increased the residual mass after pyrolysis. The fibers from t he precursors containing PMS yielded the ceramic fibers after heat tre atment at 1273 K without degradation and fusing, but they changed into crystalline fibers having thin amorphous layer on the surface after t he heat treatment at 1673 K.