The paper considers the elastic properties of epoxy composites reinforced by 6 types of silica nanoparticles with different average diameter at the same weight concentration of 1.1%. The addition of silicon nanopowders increases the modulus of elasticity. For powders of the same origin, with an increase of the modulus of elasticity, a decrease in the characteristic diameter of the filler particles at a constant concentration is observed. It is shown that the characteristic average particle size is not the only factor determining the growth of the elastic modulus, since the growth of the modulus is significantly different for powders of different producers.
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