CELLULAR SILICON-OXY-CARBIDE GLASS FROM FOAMED SILICONE RESINS

摘要

RD-19,110 CELLULAR SILICON-OXY-CARBIDE GLASS FROM FOAMED SILICONE RESINS Cellular glass structures are made by foaming select silicone resins. A foaming agent is reacted together with the silicone resin to form a foam that carries the resin as a continuous separate phase distributed throughout the foam. The foaming agent is removed by decomposition, and the remaining silicone resin is crosslinked to retain the foamed structure. The silicone resin is then heated in a nonoxidizing atmosphere at a temperature that will pyrolize the resin. During pyrolysis, the resin densifies to form a unique glass composition comprised of silicon, oxygen and carbon, where carbon is chemically bonded to silicon, but there are essentially no chemical bonds between carbon and oxygen.