The objective of our research is the development of an environmentally benign process for the fabrication of alumina-based ceramics. We have designed an alternative synthetic pathway to alumina ceramics that does not utilize toxic reagents or volatile organic chemicals (VOCs); the aqueous synthesis of "water-soluble" carboxylate-alumoxane precursors from inexpensive boehmite feed stock. Carboxylate-alumoxanes, [Al(O) x (OH) y (O 2 CR) z ] n , were synthesized by the reaction of boehmite, [Al(O)(OH)] n , with acetic acid (HO 2 CCH 3 ), methoxyacetic acid (HO 2 CCH 2 OCH 3 ), (methoxyethoxy)acetic acid (HO 2 CCH 2 OCH 2 CH 2 OCH 3 ) and [(methoxyethoxy)ethoxy]acetic acid [HO 2 CCH 2 (OCH 2 CH 2 ) 2 OCH 3 ]. Carboxylate-alumoxanes are infinitely stable at ambient conditions in solid and solution. In addition, they show no propensity to segregation or polymerization and are readily processed in aqueous or hydrocarbon medium. Upon thermolysis the carboxylate-alumoxanes are converted to alumina. The physical and spectroscopic properties of the carboxylate-alumoxanes have been determined, including particle size, molecular weight, hardness, refractive index and dielectric constants. The application of the carboxylate-alumoxanes as preceramic binders in traditional tape casting, and infiltration agents has been demonstrated. The potential environmental impact of the new alumoxane methodology as compared to traditional approaches will be discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.