Poly(alkenylpentaborane) ceramic precursors
AssigneeUniversity of Pennsylvania
InventorsLarry G. Sneddon, Mario G. L. Mirabelli
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Abstract
Novel poly(alkenylpentaboranes) such as poly-2-vinylpentaborane are useful as precursors to BN or B.sub.4 C ceramics. The non-crosslinked poly(alkenylpentaboranes), which are soluble in common inert organic solvents, are prepared heat treatment of corresponding alkenylpentaboranes. The non-crosslinked poly(alkenylpentaboranes) are heated under an inert atmosphere to crosslink them, and the crosslinked products are pyrolyzed to yield B.sub.4 C. Alternatively, the non-crosslinked poly(alkenylpentaboranes) are heated in the presence of ammonia to yield a nitrogen-containing polymer which, upon pyrolysis, yields BN.
Claims56
Ceramic precursors comprising condensation products of alkenylpentaboranes.
A process for preparing substantially non-crosslinked ceramic precursors comprising heating an alkenylpentaborane under conditions effective to induce condensation of the alkenylpentaborane but not to induce crosslinking of said ceramic precursors.
A process for preparing B.sub.4 C comprising pyrolyzing alkylpentaborane.
A process for preparing BX where x=N, P or As, comprising pyrolizing an alkenylpentaborane under XH.sub.3.
A process for preparing a film of B.sub.4 C comprising casting a film of a substantially non-crosslinked condensation product of an alkenylpentaborane, treating said film to induce crosslinking of said condensation product, and pyrolyzing said film.
A process for preparing a film of BX where X=N, P or As, comprising casting a film of a substantially non-crosslinked condensation product of an alkenylpentaborane, heating said film under XH.sub.3 to effect reaction of said condensation product with about five molar equivalents of X, and pyrolyzing said film.
A process for preparing a substrate coated with B.sub.4 C comprising coating said substrate with a substantially non-crosslinked condensation product of an alkenylpentaborane, treating said coated substrate to induce crosslinking of said condensation product, and subjecting said coated substrate to pyrolysis.
A process for preparing a substrate coated with BX where X=N, P or As, comprising coating said substrate with a substantially non-crosslinked condensation product of an alkenylpentaborane, heating said coated substrate under XH.sub.3 to effect reaction of said condensation product with about five molar equivalents of X, and subjecting said coated substrate to pyrolysis.
Dependencies are inferred from the claim text.