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Spectroscopic Investigations of Borosiloxane Bond Formation in the Sol-Gel Process.

ADA179637

Publication Date	1987
Personal Author	Irwin, A. D.; Holmgren, J. S.; Zerda, T. W.; Jonas, J.
Page Count	16
Abstract	The formation of borosilicate glass by the sol-gel process has been monitored during all stages, from the initial alkoxide solution to the final heat-treated product, using nuclear magnetic resonance and infrared spectroscopy as well as chemical analysis. The reactions of boric acid and trialkyl borates with silicon alkoxides and their hydrolysis mixtures have been studied for various compositions and catalysts. For all samples it was found that there exists only a small number of borosiloxane bonds at the time of gelation, the majority of boron being in the form of boric acid. This boric acid is condensed to borosiloxane bonds only upon heat treatment of the dried gel. For compositions having higher boron contents a small number of bonds are also formed, which do not convert upon heating to 500 C.
Keywords	Boron oxides Glass Silicates Sampling Boron Catalysts Drying Reprints Gels Gelation Infrared spectroscopy Nuclear magnetic resonance Boric acid Chemical analysis Heat treatment Hydrolysis Mixtures Magnetic resonance Alkoxy radicals Bonded joints Borosiloxane Chemical bonds Sol-Gel process Spectroscopic analysis
Source Agency	Air Force Non Paid Reprints
NTIS Subject Category	99D - Basic & Synthetic Chemistry 99A - Analytical Chemistry
Corporate Authors	Illinois Univ. at Urbana-Champaign. Dept. of Chemistry.; Air Force Office of Scientific Research, Bolling AFB, DC.
Supplemental Notes	Pub. in Jnl. of Non-Crystalline Solids, v89 p191-205 1987.
Document Type	Journal Article
NTIS Issue Number	198715

Spectroscopic Investigations of Borosiloxane Bond Formation in the Sol-Gel Process.

Spectroscopic Investigations of Borosiloxane Bond Formation in the Sol-Gel Process.
ADA179637

Publication Date	1987
Personal Author	Irwin, A. D.; Holmgren, J. S.; Zerda, T. W.; Jonas, J.
Page Count	16
Abstract	The formation of borosilicate glass by the sol-gel process has been monitored during all stages, from the initial alkoxide solution to the final heat-treated product, using nuclear magnetic resonance and infrared spectroscopy as well as chemical analysis. The reactions of boric acid and trialkyl borates with silicon alkoxides and their hydrolysis mixtures have been studied for various compositions and catalysts. For all samples it was found that there exists only a small number of borosiloxane bonds at the time of gelation, the majority of boron being in the form of boric acid. This boric acid is condensed to borosiloxane bonds only upon heat treatment of the dried gel. For compositions having higher boron contents a small number of bonds are also formed, which do not convert upon heating to 500 C.
Keywords	Boron oxides Glass Silicates Sampling Boron Catalysts Drying Reprints Gels Gelation Infrared spectroscopy Nuclear magnetic resonance Boric acid Chemical analysis Heat treatment Hydrolysis Mixtures Magnetic resonance Alkoxy radicals Bonded joints Borosiloxane Chemical bonds Sol-Gel process Spectroscopic analysis
Source Agency	Air Force Non Paid Reprints
NTIS Subject Category	99D - Basic & Synthetic Chemistry 99A - Analytical Chemistry
Corporate Authors	Illinois Univ. at Urbana-Champaign. Dept. of Chemistry.; Air Force Office of Scientific Research, Bolling AFB, DC.
Supplemental Notes	Pub. in Jnl. of Non-Crystalline Solids, v89 p191-205 1987.
Document Type	Journal Article
NTIS Issue Number	198715