United States of America As Represented by the Secretary of the Air Force

Other

Ultra Systems Limited

Ultrasystems Defense and Space, Inc.

David H Harris

Kazimiera J Paciorek

Reinhold H Kratzer

Mark E Smythe

James H Nakahara

Wilfried Krone-Schmidt

Patrick F Kimble

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.

Boron nitride preceramic polymers

Silyl containing cyclic borazines are prepared by reacting chloroborazine with disilazanes.

Boron nitride polymeric precursors

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.

This invention concerns itself with a novel class of dihalodiphospha-s-triazines as exemplified by the compound 1,3-bis[phenylchloro-phospha]-5-perfluoro-n-heptyl-2,4,6-triazines as well as their thio and azido substituted derivatives.

Halo-substituted diphospha-s-triazines and their derivatives

This invention concerns itself with a class of novel dihalo-substituted monophospha-s-triazines as exemplified by the compounds 1-dichlorophospha-3,5-bis(perfluoro-n-heptyl)-2,4,6-triazine and 1-dichlorophospha-3,5-bis[C.sub.3 F.sub.7 OCF(CF.sub.3)CF.sub.2 OCF(CF.sub.3)]-2,4,6-triazine, as well as their thio and azido derivatives.

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Sierra Madre, CA, United States of America

David H Harris