A new phenyl-containing MQ nanogel was obtained by the polycondensation of tetraethoxysilane and methyldiphenylethoxysilane in glacial acetic acid and characterized. Its effectiveness as a molecular thickener for siloxane oils was demonstrated. It was shown that its introduction into a poly(methylphenylsiloxane) liquid leads to an increase in the viscosity while maintaining the thermal and sealing characteristics.

Silica fillers have been a cornerstone in chemical technology due to their versatility, availability, and ease of integration into various formulations. Recent advancements, including chlorine-free synthesis of alkoxysilanes, have paved the way for alternative materials like polymethylsilsesquioxane (PMSSO). This study explores the structural evolution and properties of a hydrophobic PMSSO xerogel, synthesized through hydrolytic polycondensation of methyltriethoxysilane (MTEOS). PMSSO exhibits exceptional hydrophobicity, high specific surface area, and compatibility with polymer matrices, making it a promising filler for applications in rubber products, lubricants, and cosmetics. We developed a straightforward synthesis method for producing PMSSO xerogel that avoids toxic solvents and organochlorosilanes, ensuring safety and sustainability. The reaction conditions, particularly the amount of alkali and neutralization parameters, were found to significantly influence the properties of the final xerogels, such as specific surface area. Optimization of the synthesis parameters allow for obtaining PMSSO xerogels with a specific surface area about 600 m²/g. These findings underscore PMSSO’s potential as a versatile, eco-friendly alternative to conventional silica fillers, offering tailored properties for diverse industrial applications.

A method for synthesizing a nonfunctional poly(methyl)-phenylzirconiumsiloxane oligomer by blocking the functional groups of tetrakis(methylphenylmethoxysiloxy)zirconium with (diphenylmethylsiloxy)dimethylsilanol has been developed. The possibility of using the resulting oligomer in a composition based on a polymethylphenylsiloxane oil has been studied. It is shown that a small addition of poly(methyl)phenylzirconiumsiloxane to the polymethylphenylsiloxane oil not only increases the heat resistance of the oil, but also slightly increases its viscosity.