Catalytic Synthesis of Inorganic Polymers for High Temperature Applications and as Ceramic Precursors.

摘要

Polysilsesquioxanes, -(RSi(O)1.5)x(-), exhibit many properties that are potentially quite useful for industrial applications. These properties include high temperature stability (approx. 600 deg C in Oxygen); good adhesion and, liquid crystal-like behavior for some derivatives. Moreover, polymethylsilsesquioxane has been used successfully as a precursor for the fabrication of carbon fiber/'black glass' (SiO2/SiC/C) composites and 'black glass' fibers. Current methods of preparation depend on hydrolysis of RSiCl3 or RSi(OR)3. Unfortunately, this approach leads to several products that are difficult to purify because polysilsesquioxanes exhibit a great propensity for forming gels. Keywords: Polymers, Ceramic materials, Copolymers, Catalysis, Synthesis, Polysiloxane, Silicon, Oxygen. (JG)