Boron nitride preceramic polymers
AssigneeUltrasystems, Inc.
InventorsKazimiera J. L. Paciorek, Reinhold H. Kratzer, David H. Harris, Mark E. Smythe, Patrick F. Kimble
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Abstract
B-triamino-N-tris(trialkylsilyl)borazines, their condensation products, and the transformation of these into preceramic polymers amenable to fiber drawing and ultimately boron nitride fiber formation.
Claims8
B-triamino-N-tris(trialkylsilyl)borazines ##STR3## wherein R is methyl, ethyl, or butyl of the general formula C.sub.n H.sub.2n+1.
B-triamino-N-tris(trimethylsilyl)borazine ##STR4##
Condensed B-triamino-N-tris(trialkylsilyl)borazines, singly and doubly bridged and mixtures thereof ##STR5## where R is methyl, ethyl, or butyl of the general formula C.sub.n H.sub.2n+1 and where x is a positive integer.
Condensed B-triamino-N-tris(trimethylsilyl)borazines, singly and doubly bridged and mixtures thereof ##STR6## where x=1, 2, 3, 4, 5, 6, 7, 8.
A method for condensing B-triamino-N-tris(trialkylsilyl)borazines and their dimers, trimers, tetramers, and octamers having the formula ##STR7## where R is methyl, ethyl, or butyl of the general formula C.sub.n H.sub.2n+1 and where x is a positive integer from 1 to 8, into preceramic polymers by gradual heat treatment from about 50.degree. C. to 300.degree. C. over a period of time varying from about 8 hr to 250 hr in an inert atmosphere.
The method of claim 8 wherein the compounds are condensed B-triamino-N-tris(trimethylsilyl)borazines, singly and doubly bridged and mixtures thereof.
Dependencies are inferred from the claim text.