In this work, the (PEO-PVA-Sb 2 O 3 ) nanocomposites were prepared from (PEO-PVA) blend with different concentrations of the Sb 2 O 3 nanoparticles by using the casting method to used it for different modern applications such as: antibacterial, humidity sensors, solar cells, diodes, thermal energy storage and release ...etc. The structural, optical and dielectric properties of (PEO-PVA-Sb 2 O 3 ) nanocomposites have been studied. The results of optical properties for nanocomposites showed that

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... he absorbance has high values at UV region. Also, its increase while the transmittance and energy band gap reduce of (PEO-PVA) blend with the increase in Sb 2 O 3 nanoparticles concentrations. The absorption coefficient, extinction coefficient, refraction index, dielectric constant and optical conductivity are increased with the increase in Sb 2 O 3 nanoparticles concentrations. The dielectric properties of nanocomposites showed that the dielectric constant, dielectric loss and A.C electrical conductivity of (PEO-PVA) blend increase with the increase in Sb 2 O 3 nanoparticles concentrations. Also, the dielectric constant and dielectric loss of (PEO-PVA-Sb 2 O 3 ) nanocomposites decrease while the A.C electrical conductivity increases with the increase in frequency. finally, the (PEO-PVA-Sb 2 O 3 ) nanocomposites tested for antibacterial applications. The results showed that the the (PEO-PVA-Sb 2 O 3 ) nanocomposites have good activity for antibacterial.