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Structure and water durability of tin(II) organosilicophosphate glasses prepared by nonaqueous acid–base reactions

Published online by Cambridge University Press:  01 July 2006

Megumi Mizuno ,
Masahide Takahashi  and
Toshinobu Yoko
Megumi Mizuno
Affiliation:
Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan; and PRESTO (Precursory Research for Embryonic Science and Technology), Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
Masahide Takahashi*
Affiliation:
Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan; and PRESTO (Precursory Research for Embryonic Science and Technology), Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
Toshinobu Yoko
Affiliation:
Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Tin(II) organosilicophosphate glasses were prepared by nonaqueous acid–base reactions using orthophosphoric acid, dimethyldichlorosilane, and tin(II)chloride as the starting materials. The structure of the methylsiloxane-phosphate copolymer (methylsilicophosphate) and tin(II) methylsilicophosphate glasses was mainly investigated by the 31P nuclear magnetic resonance technique. A chain structure composed of the –(P–O–Si–O)m– silicophosphate bonds was found as the main structural unit in the methylsilicophosphate prepared by mixing orthophosphoric acid and dimethyldichlorosilane at room temperature. Tin(II) methylsilicophosphate glasses could be prepared by introducing SnCl2 as a cross-linking agent of silicophosphate chains. By increasing the reaction temperature, it was possible to promote the reaction and then to increase the network dimensions of the resultant tin(II) methylsilicophosphate glasses. It was found that the glasses with a high degree of condensation tend to have a better water durability in a humid atmosphere.

Keywords

AmorphousPolymerizationSol-gel
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 7 , July 2006 , pp. 1798 - 1806
Copyright
Copyright © Materials Research Society 2006

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