Silica nanoparticles were prepared from tetraethoxysilane (TEOS) in ethanol solvent by sol-gel method withalkaline catalyst. The IR spectrum of silica nanoparticles shows that they were successfully prepared through strongpeaks characterizing the stretching and bending vibration of Si-O group. Silica nanoparticles were well-formed in the sphereshape with the average particle size about 50-100 nm (as shown in FESEM image). The X-Ray diffraction (XRD)pattern of silica nanoparticles exhibits are amorphous. With the above characteristics, silica nanoparticles are suitable touse as reinforcement for ethylene vinyl acetate (EVA) copolymer. The obtained results of rheological and thermalproperties of EVA/silica nanocomposites proved that the dynamic storage modulus and thermal stability of EVA wereremarkable enhanced by using nanosilica. Specially, the addition of ethylene vinyl acetate copolymer grafted maleicanhydride (EVAgMA) as a compatibilizer into EVA/silica nanocomposites, the above properties of the nanocompositesare significantly increased.
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