Preparation and characterization of high dielectric calcium titanate -poly(methylmethacrylate) composite films

ABSTRACTIn this study, calcium titanate (CaTiO3; CTO)/poly (methylmethacrylate) (PMMA) composite films were synthesized by methylmethacrylate through ultrasonic dispersion via in-situ polymerization. X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis study were carried out to characterize the samples. The dielectric and electrical properties of the composite films were studied in detail through impedance analyzer. The results showed that the dielectric constant of the composite increased with an increase in the weight percentages of CTO contents at entire frequency range under investigation. The value of dielectric constant of the resultant composite was nearly ≈51 at 100 Hz, while the value of dielectric loss was quite low (<1), which may be attributed to space charge polarization mechanism. In addition, the maximum electrical conductivity (1.0116 × 10−6 S/cm−1) was achieved for 30 wt.% of CTO-PMMA composites which may be due to the ele...