Superior dielectric and electrical characteristics of poly(methylmethacrylate) (PMMA)-BiFeO3-Polystyrene-2% divinyl benzene (PDB) composites

Abstract

An extraordinarily high dielectric constant and low dielectric loss PMMA-BFO-PDB composite material was developed by mixing poly(methylmethacrylate) (PMMA) as the polymer matrix, bismuth ferrite (BFO), and polystyrene 2% divinyl benzene (PDB) as fillers using the solution casting process. The surface morphology analysis demonstrations the PDB particle uniformly dispersed in the PMMA matrix. The frequency dependent dielectric and electrical characteristics of the PMMA-BFO-PDB composite films on various weight percentages of PDB contents and wide range of frequency at room temperature were investigated. It is observed that the maximum dielectric constant of the PMMA-BFO-PDB composites was achieved around ≈ 108 and similarly dielectric loss factor of just about ≈ 1 for 20 wt% of PDB contents at 102 Hz. In addition, the PMMA-BFO-PDB composite achieved a dielectric constant of 108 at 102 Hz, which is 21 times higher than that of the pure PMMA matrix. PMMA-BFO-PDB composite films may be used as a high performance dielectric in future energy storage devices, such as high storage capacitors. © 2023 Elsevier GmbH