Accession Number:

ADA250351

Title:

From Minerals to Materials: A Facile Synthetic Route to Preceramic Polymers for Aluminum Oxide

Descriptive Note:

Technical rept.,

Corporate Author:

HARVARD UNIV CAMBRIDGE MA DEPT OF CHEMISTRY

Report Date:

1992-05-12

Pagination or Media Count:

9.0

Abstract:

Reaction of boehmite, AlOOHn, with an excess of carboxylic acid HO2CR results in the formation of the carboxy substituted alumoxanes, AlO xOHyO2CRzn where 2x y z 3 and R alkyl substituents. The alumoxanes have been fully characterized by SEM, elemental analysis, IR and multinuclear NMR spectroscopy. The physical properties of the alumoxanes are highly dependent on the identity of R, and range from insoluble crystalline powders, e.g. R CH3, to powders which readily form solutions or gels in hydrocarbon solvents, e. g. R C5H11. All of the alumoxanes decompose under mild thermolysis to yield gamma-alumina.

Subject Categories:

  • Inorganic Chemistry
  • Polymer Chemistry
  • Geology, Geochemistry and Mineralogy
  • Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE