The role of transesterification in the multistep "prehydrolysis" sol/gel synthesis of aluminum-rich aluminosilicate gels

G. A. Pozarnsky; A. V. McCormick

doi:10.1557/JMR.1996.0115

The role of transesterification in the multistep "prehydrolysis" sol/gel synthesis of aluminum-rich aluminosilicate gels

G. A. Pozarnsky, A. V. McCormick

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

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Abstract

Using a prehydrolysis technique, transparent gels with very high aluminum content can be achieved with the use of isopropanol. Here ¹³C, ²⁷Al, ²⁹Si and ¹⁷O NMR at various stages of preparation show that when the aluminum added exceeds the number that silanols can fully protect, the excess aluminum alkoxide groups readily undergo transesterification with isopropanol. The aluminum isopropoxide (Al-OPrⁱ) groups thus formed are shown to be sufficiently stable that attack by water is impeded, thus allowing the remaining silicon alkoxide groups to hydrolyze and condense to form a homogeneous gel.

Original language	English (US)
Pages (from-to)	922-927
Number of pages	6
Journal	Journal of Materials Research
Volume	11
Issue number	4
DOIs	https://doi.org/10.1557/JMR.1996.0115
State	Published - Apr 1996

Bibliographical note

Funding Information:
This work was supported by the Office of Naval Research and by a fellowship to GAP from the University of Minnesota Center for Interfacial Engineering, an NSF Engineering Research Center. The authors are also grateful for helpful discussions with Prof. Christopher Macosko, Dr. Jorge Sanchez (U. of Minnesota), and Dr. Joseph Bailey (3M), and Kangtaek Lee (U. of Minnesota).

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abstract = "Using a prehydrolysis technique, transparent gels with very high aluminum content can be achieved with the use of isopropanol. Here 13C, 27Al, 29Si and 17O NMR at various stages of preparation show that when the aluminum added exceeds the number that silanols can fully protect, the excess aluminum alkoxide groups readily undergo transesterification with isopropanol. The aluminum isopropoxide (Al-OPri) groups thus formed are shown to be sufficiently stable that attack by water is impeded, thus allowing the remaining silicon alkoxide groups to hydrolyze and condense to form a homogeneous gel.",

author = "Pozarnsky, {G. A.} and McCormick, {A. V.}",

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AU - McCormick, A. V.

N1 - Funding Information: This work was supported by the Office of Naval Research and by a fellowship to GAP from the University of Minnesota Center for Interfacial Engineering, an NSF Engineering Research Center. The authors are also grateful for helpful discussions with Prof. Christopher Macosko, Dr. Jorge Sanchez (U. of Minnesota), and Dr. Joseph Bailey (3M), and Kangtaek Lee (U. of Minnesota).

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N2 - Using a prehydrolysis technique, transparent gels with very high aluminum content can be achieved with the use of isopropanol. Here 13C, 27Al, 29Si and 17O NMR at various stages of preparation show that when the aluminum added exceeds the number that silanols can fully protect, the excess aluminum alkoxide groups readily undergo transesterification with isopropanol. The aluminum isopropoxide (Al-OPri) groups thus formed are shown to be sufficiently stable that attack by water is impeded, thus allowing the remaining silicon alkoxide groups to hydrolyze and condense to form a homogeneous gel.

AB - Using a prehydrolysis technique, transparent gels with very high aluminum content can be achieved with the use of isopropanol. Here 13C, 27Al, 29Si and 17O NMR at various stages of preparation show that when the aluminum added exceeds the number that silanols can fully protect, the excess aluminum alkoxide groups readily undergo transesterification with isopropanol. The aluminum isopropoxide (Al-OPri) groups thus formed are shown to be sufficiently stable that attack by water is impeded, thus allowing the remaining silicon alkoxide groups to hydrolyze and condense to form a homogeneous gel.

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The role of transesterification in the multistep "prehydrolysis" sol/gel synthesis of aluminum-rich aluminosilicate gels

Abstract

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