Structure, hydrophobicity, and hydrothermostability of MCM-41 organo-inorganic mesoporous silicates silylated with dimethoxydimethylsilane and dichloromethylphenylsilane

摘要

Changes in the structure, hydrophobicity, and hydrothermal stability of organo-inorganic composite materials based on MCM-41 as a result of silylation with dimethoxydimethylsilane (DMODMS) and dichloromethylphenylsilane (DCMPS) were considered. Based on the data on the competitive adsorption of water and toluene it was shown, using the Weitkamp procedure, that the grafting of organosilyl groups affects the sorption properties of mesoporous materials. Hydrothermal treatment led to considerable changes in the structure and properties of the materials. The thermal stability of MCM-41 composites and changes in their hydrophilicity due to the grafting of DMODMS and DCMPS and hydrothermal treatment were studied by thermogravimetry.