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Th e aim of this work was to investigate the influence of the chemical nature of the filler surface on the properties of hybrid organo-in organic nanocomposites based on epoxy oligomer ED-20 in the presence of nanoscale functional filler of inorganic originaerosil, with different surface nature. Th e influence of the chemical nature of the surface of highly dispersed aerosil on the thermal properties of nanocomposites based on epoxy oligomer ED-20 has been studied. Th e peculiarities of the process of thermo-oxidative destruction have been studied. It is shown that the introduction of highly dispersed aerosil in the amount of 0.5% in the epoxy matrix does not lead to changes in the thermal properties of composites, and the nanofiller in the amount of 5% improves thermal stability of composites. Th e kinetics of the curing process of epoxy nanocomposites was studied by IR-spectroscopy. Th e influence of the presence of functional groups on the nanofiller surface on rate and the degree of conversion of epoxy groups was determined. Th e presence of hydroxyl groups on the surface of A-300 contributes to the rate of conversion of epoxy groups to a greater extent, compared with aerosil with a modified surface, which contains on the surface methyl groups capable of blocking reactive groups. It is established that the rate of conversion of epoxy groups in the presence of aerosil decreases in the range of ED-20 > ED20 + A-300 > ED-20 + AM-300. Th e sorption properties of epoxy nanocomposites have been studied. It is established that the sorption process proceeds at a higher rate when the matrix is filled with unmodified aerosil. Th e mechanism of influence of the chemical nature of the filler surface and content on formation and properties of epoxy nanocomposites is discussed. [ABSTRACT FROM AUTHOR]