Abstract
The drying process of titanium alkoxide-derived precipitates has been studied by means of FT-IR spectroscopy and DSC analysis. From the FT-IR spectrum, it has been possible to observe that unhydrolyzed alkoxide molecules continue the hydrolysis process by using water molecules retained inside the structure of the precipitate or formed by condensation of the Ti–OH groups. However, the quantification of the water content inside the precipitate was carried out by DSC analysis. This technique also allowed to determine two kinds of water molecules: free or interstitial water and coordinatively bound water. These two kinds of water gave two endothermic peaks at ca. 160–180° and 305°C, respectively. The transformation of the amorphous precipitate to a crystalline one is detected by an exothermic peak at ca. 314°C. The elimination of the coordinatively bound water is associated with this crystalline transformation.
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