High Permittivity Poly(methyl methacrylate)/SrTiMnO3 Composites

Abstract

High permittivity Poly (Methyl Methacrylate) (PMMA) and Sr TiMnO (STMO) composites were fabricated via melt 2 6 mixing followed by hot pressing technique. These were characterized using X-ray diffraction (XRD), Scanning electron microscopy (SEM), thermo gravimetric (TGA), Density, Hardness, electrical properties like Volume resistivity, Permittivity and AC conductivity. SEM revealed that the crystallites are well distributed and the porosity is almost negligible. Both density and hardness were improved as the STMO content increased in the PMMA matrix. Addition of STMO in PMMA reduces the resistivity of the composite due to the increase in the conductivity of the composite as revealed by the AC conductivity. Permittivity values as high as 23 @ 100 Hz has been achieved (PMMA+STMO-50%), demonstrating that this PMMA+STMO composite can be exploited for the fabrication of high energy storage capacitor application.