Silicon carboxide ceramics from spirosiloxanes

A spirosiloxane oligomer formed by the process comprising the steps of:

• (a) mixing a hydrocarbon solvent chosen from the group consisting of the C.sub.5 to C.sub.10 alkanes, an alcohol chosen from the group consisting of the C.sub.1 to C.sub.4 alkyl alcohols, and water;
• (b) adding a dichlorosilane having the substitutions R and R' wherein R is selected from the group consisting of alkyl groups from C.sub.1 to C.sub.20, and R' is hydrogen, and a second silicon compound chosen from the group consisting of silicon tetrachloride and Si(OR").sub.4, wherein R" is C.sub.1 to C.sub.4 alkyl group, to the mixture to form the spirosiloxane oligomers;
• (c) separating the organic phase of the mixture from the aqueous phase;
• and
• (d) neutralizing and drying the organic phase and filtering to recover the spirosiloxane oligomer.

A spirosiloxane oligomer formed by the process comprising the steps of:

• (a) mixing a hydrocarbon solvent chosen from the group consisting of the aromatic hydrocarbons and the C.sub.5 to C.sub.10 alkanes, an alcohol chosen from the group consisting of the C.sub.1 to C.sub.4 alkyl alcohols, and water;
• (b) adding a dichlorosilane having the substitutions R and R' wherein R is selected from the group consisting of alkyl groups from C.sub.1 to C.sub.20, and R' is selected from the group consisting of alkenyl groups from C.sub.2 to C.sub.20, and a second silicon compound chosen from the group consisting of silicon tetrachloride and Si(OR").sub.4, wherein R" is a C.sub.1 to C.sub.4 alkyl group, to the mixture to form the spirosiloxane oligomer;
• (c) separating the organic phase of the mixture from the aqueous phase;
• and
• (d) neutralizing and drying the organic phase and filtering to recover the spirosiloxane oligomer.

A spirosiloxane oligomer formed by the process comprising the steps of:

• (a) mixing a Si(OR").sub.4, wherein R" is a C.sub.1 to C.sub.4 alkyl group, with a cyclosiloxane having the substitutions R and R' wherein R is selected from the group consisting of alkyl groups from C.sub.1 to C.sub.20, and R' is selected from the group consisting of alkenyl groups from C.sub.2 to C.sub.20 ;
• (b) adding a C.sub.5 to C.sub.10 alkane, a C.sub.1 to C.sub.4 alcohol and an acid and stirring the mixture to form the spirosiloxane oligomer;
• (c) neutralizing the mixture;
• (d) separating the organic from the aqueous phase;
• and
• (e) washing and drying the organic phase and filtering to recover the spirosiloxane oligomer.