Influence of the Structure of Hydrophobic Porous Silica Materials of SBA-15 Type and Polymethylsiloxane Derivatives on the Value of Water Intrusion Pressure

Abstract

A series of silica mesoporous molecular sieves SBA-15 with a 7.7 0.8 nm pore diameter, the surface of which is hydrophobized with methylsilyl groups, and polymethylsiloxane derivatives with a 1.6 0.8 nm pore diameter were obtained. These sieves are characterized by X-ray phase analysis, adsorption of nitrogen at 77 K and water at 293 K, as well as IR spectroscopy. It is established that there is a significant resistance to water intrusion (absorption) only in the case of substances characterized by the nitrogen adsorption potential value 0 6.4 kJ/mol. The studied systems can be used as "molecular springs" in shock load damping devices due to their functional properties.