Boron nitride preceramic polymers
OwnerKazimiera J. L. Paciorek, Reinhold H. Kratzer +2inventors
InventorsKazimiera J. L. Paciorek, Reinhold H. Kratzer, David H. Harris, Wilfried Krone-Schmidt
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Abstract
A preceramic substituted borazine polymer of the formula: ##STR1## wherein R is methyl, ethyl, propyl, or butyl, and x is a positive integer. Also disclosed are methods for making the polymer, methods for converting the polymer into coatings, shaped articles, articles including fibers and filaments formed from the polymer, blends of the foregoing polymer and preceramic triamino-N-tris (trialkylsilyl) borazines, and methods for thermally decomposing the foregoing polymers to form shaped articles of boron nitride.
Claims11
The polymer ##STR6## where R is methyl, ethyl, propyl or butyl of the general formula C.sub.n H.sub.2n+1 and where X is a positive integer, in the form of fibers or filaments.
The polymer ##STR7## in the form of a shaped article.
A shaped article formed from one or both of the following polymers ##STR8## wherein R is lower alkyl of the general formula C.sub.n H.sub.2n+1, and X is a positive integer.
Fibers or filaments formed from a mixture of the polymer ##STR9## and one or both of the following polymers ##STR10## wherein R is lower alkyl of the general formula C.sub.n H.sub.2n+1, and X is a positive integer.
Shaped articles formed from a mixture of the polymer ##STR11## and one or both of the polymers ##STR12## wherein R is lower alkyl of the general formula C.sub.n H.sub.2n+1, and X is a positive integer.
The process of preparing the polymer ##STR13## comprising the steps of:
- (a) reacting chloroborazine with a disilazine in a mixture of organic solvents, said mixture having at least one aromatic component and at least one non-polar aliphatic component, in an atmosphere of an inert gas, and at a temperature below 0.degree. C. but above the freezing point of said mixture for a period long enough to form a polymer solution;
- (b) removing precipitate from said polymer solution;
- and
- (c) then isolating the polymer by removing said solvents from said polymer solution.
Dependencies are inferred from the claim text.