Authors:
M. Zaharescu Romanian Academy Institute of Physical Chemistry Spl. Independentei 202 Bucharest 77208 Spl. Independentei 202 Bucharest 77208

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A. Jitianu Romanian Academy Institute of Physical Chemistry Spl. Independentei 202 Bucharest 77208 Spl. Independentei 202 Bucharest 77208

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A. Brãileanu Romanian Academy Institute of Physical Chemistry Spl. Independentei 202 Bucharest 77208 Spl. Independentei 202 Bucharest 77208

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V. Bãdescu Romanian Academy Institute of Physical Chemistry Spl. Independentei 202 Bucharest 77208 Spl. Independentei 202 Bucharest 77208

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G. Pokol Budapest Technical University Institute of General and Analytical Chemistry Szt. Gellért tér 4 Budapest 1521 Hungary Szt. Gellért tér 4 Budapest 1521 Hungary

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J. Madarász Budapest Technical University Institute of General and Analytical Chemistry Szt. Gellért tér 4 Budapest 1521 Hungary Szt. Gellért tér 4 Budapest 1521 Hungary

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Cs. Novák Budapest Technical University Institute of General and Analytical Chemistry Szt. Gellért tér 4 Budapest 1521 Hungary Szt. Gellért tér 4 Budapest 1521 Hungary

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Abstract  

The hydrolysis-polycondensation of organically 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.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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