Preceramic silazane polymer for ceramic materials
View Patent ↗A method of forming a preceramic polymer includes treating a silane precursor having a vinyl moiety of ammonia to produce the preceramic polymer. For example, the silane precursor is trichlorovinylsilane. The preceramic polymer may then be cross-linked at a relatively low temperature by using a cross-linking agent.
1. A method of forming a preceramic silazane polymer, comprising:
mixing tetrahydrofuran as a carrier solvent with a silane precursor that includes trichlorovinylsilane in a ratio of about 10 parts of the tetrahydrofuran to about 1 part of the trichlorovinylsilane;
treating the silane precursor with ammonia; and
adding a cross-linking agent to the silane precursor, wherein the cross-linking agent is dicumyl peroxide, to initiate cross-linking of the trichlorovinylsilane and produce the preceramic silazane polymer.
2. The method as recited in claim 1 , including producing a byproduct that includes ammonium chloride.
3. The method as recited in claim 2 , including filtering to separate ammonium chloride byproduct from the preceramic silazane polymer.
4. The method as recited in claim 1 , including extracting the carrier solvent under a vacuum to separate the carrier solvent from the preceramic silazane polymer.
5. The method as recited in claim 1 , including treating at a temperature of about −10° C. to 10° C.
6. The method as recited in claim 5 , including treating at a temperature of about 0° C.
7. The method as recited in claim 1 , including adding about 1 wt. % of the dicumyl peroxide to the silane precursor.