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US 4,971,779 AGranted
Process for the pyrolytic conversion of a polymeric precursor composition to boron nitride
AssigneeUniversity of New Mexico
InventorsRobert T. Paine, Jr., Chaitanya K. Narula
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Abstract
The disclosure is directed to polymeric B-aminoborazene compounds suitable for pyrolytic conversion to boron nitride. The B-aminoborazene compounds are preferably mixed with an organic solvent and a cross-linking agent to form a polymeric gel. The polymeric gel is then pyrolized to form boron nitride. The polymeric gel is useful to coat various forms and materials.
Claims28
A process for the pyrolytic conversion of a polymeric precursor composition to boron nitride comprising the following steps:
- (a) obtaining a B-aminoborazene compound having a general formula selected from the group consisting of (ClB).sub.2 (BNR.sub.2)(NH).sub.3, (ClB).sub.2 [BN(H)R](NH).sub.3 and (ClB).sub.2 [BN(SiR.sub.3).sub.2 ](NH).sub.3 and wherein each R is a member selected from the group consisting of alkyl groups and aryl groups;
- (b) dissolving the B-aminoborazene compound in a solvent in the presence of a cross-linking agent to form a polymeric gel by linear polymerization;
- (c) removing substantially all the solvent from said polymeric gel;
- and
- (d) converting the polymeric gel to boron nitride by pyrolysis.
2 more elements
Dependencies are inferred from the claim text.