Synthesis and Characterization of Poly(methylsilane) as Ceramic Precursor

1Introduction Polysilanes are novel polymers with Si-Si catenation chain. They can be used as precursors for SiC ceramic, have important applications in anti-oxidation of C/C composites[1]. Poly(methylsilane)(PMS), which is anideal precursor to stoichiometric SiC, is synthesized by the sodium polycondensation reaction of monomer CH3SiHCl2. During the reaction, there is an initiation period. In this period there is no obvious exothermic reaction after dropping of monomer, then suddenly eruptive reaction arise and temperature goes up quickly. After the eruption, the polymerization can proceed smoothly. This phenomenon is harmful to scale-up. To solve this problem, we did relevant research, but the additive, crown ether, is expensive[2]. This paper describes the influence of naphthalene(NAPH) and p-dibromobenzene(DBB) on the reaction. Good effect is attained for these additives.