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Hydrolysis-Polycondensation in Binary Phosphorus Alkoxides—TEOS System Studied by GC-MS

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Abstract

It is well known that various phosphorus precursors exhibit different reactivities towards hydrolysis-polycondensation in acidic media. The hydrolysis-condensation in binary P-alkoxides—TEOS system was studied by GC-MS, in relation to the mentioned reactivity. As P-precursors, the following reagents were used: PO(OMe)3, PO(OEt)3, PO(OBu)3, P(OEt)3 and HOP(OMe)2. PO(OMe)3, PO(OEt)3 and PO(OBu)3 do not hydrolyze, but change the TEOS hydrolysis-polycondensation ratio. P(OEt)3 partially hydrolyzes and transforms into a very stable HOP(OEt)2 form, while HOP(OMe)2 reacts very fast with nonparental solvent and undergoes transesterification. Si–O–P bonds have not been observed in early stages of hydrolysis-polycondensation. However, the gelling tendency is strongly influenced by the P-precursor.

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Authors
  1. M. Zaharescu
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  2. A. Vasilescu
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  3. V. Badescu
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  4. M. Radu
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Zaharescu, M., Vasilescu, A., Badescu, V. et al. Hydrolysis-Polycondensation in Binary Phosphorus Alkoxides—TEOS System Studied by GC-MS. Journal of Sol-Gel Science and Technology 8, 59–63 (1997). https://doi.org/10.1023/A:1026438820378

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  • DOI: https://doi.org/10.1023/A:1026438820378

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