Synthesis and characterization of processable polyborate precursors |
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| Authors: | Bruce Wade N Venkatasubramanian P Desai A S Abhiraman E C Ashby L T Gelbaum |
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| Institution: | (1) Polymer Education and Research Center, Georgia Institute of Technology, 30332 Atlanta, Georgia;(2) Present address: Monsanto Fibers Division, 35609-2204 Dacatur, AL;(3) Present address: U. Dayton Research Institute, 45469 Dayton, OH;(4) School of Chemistry & Biochemistry, Georgia Institute of Technology, 30332 Atlanta, Georgia;(5) NMR Laboratory, Research Center for Biotechnology, Georgia Institute of Technology, 30332 Atlanta, Georgia |
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| Abstract: | Polyborates have been formed by disproportionation and polycondensation of trimethoxyboroxine and also of trimethoxyboroxine
and boric acid. The crtiical role of stoichiometry in the formation of polyborates without requiring incorporation of a metal
counter ion is revealed. The emphasis is on integration of this chemistry with fabrication processes. Incorporation of an
appropriate linear organic polymer is shown to yield the required rheological and thermal characteristics in this regard.
These polyborates are inferred to be suitable as precursors for boron nitride in geometrical forms that can be processed as
supported structures. However, they are also determined to be unsuitable as precursors for boron nitride fibers, oriented
or isotropic, primarily due to their low glass transition temperature. |
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| Keywords: | polyborate sol-gel ceramic precursor boron nitride |
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