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Conducting polymer electrolytes based on poly(vinyl alcohol) (PVA) as a host polymer matrix and polyionic liquid (PIL) hydrophilic/hydrophobic were prepared by solution casting technique and characterized by FTIR, scanning electron microscope (SEM), mechanical, conductivity, dielectric spectroscopy and thermogravimetric analysis. It was found that the presence of PIL affected positively both mechanical and electrical properties of the polymer electrolytes. Polymer electrolytes with PIL-dispersion give the best tensile strength compared to those with PIL-solid. From the results of mechanical properties, it is concluded that PIL-dispersion can act as a plasticizer, whereas PIL-solid can act as traditional filler. The addition of PIL-dispersion significantly increased the permittivity ε′ and dielectric loss ε″ and improved the ionic conductivity of the polymer electrolytes compared to PIL-solid. The ionic conductivity …