LEWIS BASE ADDUCTS OF DECABORANE FOR FORMING NEW PRECERAMIC POLYMERS, USING AS BINDERS, FORMING SHAPED BODIES AND FORMING FIBERS

摘要

New soluble preceramic polymers formed by reacting B10H14-nRn, (where R is a lower alkyl group having from 1 to about 8 carbon atoms, a substituted or unsubstituted cycloalkyl group having from 3 to about 8 carbon atoms, a substituted or unsubstituted lower alkenyl group having from 2 to about 8 carbon atoms, or a substituted or unsubstituted lower aryl group having from 6 to about 10 carbon atoms, and n is a number from zero to about six) with a diamine in an organic solvent are disclosed. Preferably the diamine has the formula R?1R2N-R3-NR4R5¿ where R?1, R2, R4 and R5¿ are H, a lower alkyl group having from 1 to about 8 carbon atoms, a substituted or unsubstituted cycloalkyl group having from 3 to about 8 carbon atoms, a substituted or unsubstituted lower alkenyl group having from 2 to about 8 carbon atoms, a substituted or unsubstituted lower aryl group having from 6 to about 10 carbon atoms, or a di- or triorganosilyl. R3 is a lower alkylene group having from 1 to about 8 carbon atoms, a substituted or unsubstituted cycloalkylene group having from 3 to about 8 carbon atoms, a substituted or unsubstituted lower alkenylene group having from 2 to about 8 carbon atoms, a substituted or unsubstituted lower arylene group having from 6 to about 10 carbon atoms, a subsitituted or unsubstituted group, a heteroatom-containing cycloalkylene group, a heteroatom-containing alkenylene group, or a heteroatom-containing arylene group. A method of using Lewis base adducts of decarborane of the formula B¿10?H12-nRn?.¿2L, where R and n are as defined above and L is any neutral Lewis base, can be used as binders for ceramic powders is also disclosed. And a method of using these Lewis base adducts as precursors in forming shaped ceramic bodies is also described.