Thermal stability of SiO2-based inorganic-organic hybrid materials

M. Zaharescu, A. Jitianu, A. Brãileanu, V. Bãdescu, G. Pokol, J. Madarász, Cs Novák

Research output: Contribution to journalConference article

17 Citations (Scopus)

Abstract

The hydrolysis-polycondensation of organicallly modified Si-alkoxides leads to the obtaining of inorganic-organic hybrid materials in which the organic moieties remain as permanent groups bonded to the inorganic network. The molecular species previously determinated by GC-MS during the gelation process have been significantly different according to the type of the alkoxide used. In the present work, thermal stability of SiO2-based inorganic-organic hybrid materials starting with TEOS (tetraethoxysilan), MTEOS (triethoxymethylsilan), VTEOS (triethoxyvinylsilan) and MTMOS (trimethoxymethylsilan) was studied. The molecular structure of the gels obtained determines differences in their thermal behaviour. Gels obtained starting with MTEOS show the highest thermal stability, while gels obtained using VTEOS the lowest, among the substituted alkoxides. A particular behaviour presents the gel obtained with MTMOS that decomposes in four steps. This could be explained by the presence in the gel of some prevalent types of molecular species with different thermal stability.

Original languageEnglish
Pages (from-to)191-198
Number of pages8
JournalJournal of Thermal Analysis and Calorimetry
Volume56
Issue number1
Publication statusPublished - Jan 1 1999
EventProceedings of the 1998 7th European Symposium on Thermal Analysis and Calorimetry - Balatonfured, Hung
Duration: Aug 30 1998Sep 4 1998

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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