Effect of reaction conditions on surface properties of TEOS–TBOT–PDMS hybrid materials

摘要: Hybrid materials based on tetraethoxysilane (TEOS), tetrabutyl orthotitanate (TBOT), and hydroxyl terminated polydimethyl siloxane (PDMS) have been prepared characterized. The effects of HCl concentration PDMS molecular weight (MW) analysed. physical chemical characteristics discussed the results obtained from characterization by Raman spectroscopy, nitrogen adsorption, mercury intrusion porosimetry inverse gas chromatography (IGC). Specific surface areas (SSA) pore volumes increase with are independent Mw. SSA values as high 300 m2 g−1 for hybrid HCl:(TEOS + TBOT) 0.3 Mw 550 g mol−1. These present higher lower sizes. However, 0.5, only macroporous low 2–4 m2 g−1, sizes close to 10 μm. In general presence Ti porosities give a little decrease in such values. Surface energies consistent those organic–inorganic materials. Dispersive Si–Ti and, all them, they both This result can be assigned (or CH3 groups) material well disordered anatase-like structures. On other hand, acid base properties dependent It has observed that parameters influenced disorder degree amorphous titanium oxide them. As increase.