Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 19, Issue 1-3, Pages 403-407Publisher
SPRINGER
DOI: 10.1023/A:1008783010298
Keywords
hybrid gels; silica; polytetrahydrofuran; DRIFTS; NMR
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Hybrid inorganic-organic gels have been prepared by the sol-gel process using tetraethoxysilane (TEOS) as precursor, mixed with a low concentration of polytetrahydrofuran (PTHF), under acid catalysis. The hybrid xerogels were characterized by DRIFTS and Solid State H-1, C-13 and Si-29 NMR. The DRIFT spectra indicate that the polymer is responsible for decreasing the number of free silanol groups in comparison to pure silica. Solid-state NMR spectra reveal the types of silicate structures formed and the conditions for establishing chemical bonds between the two phases, which are responsible for the silica network flexibility. We have concluded that it is possible to design a hybrid gel with tailored properties, even at very low polymer concentration, by selecting the appropriate preparation route.
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