| 초록 |
Recently numerous studies about high energy density materials have been conducted to improve dielectric performances of pulsed power capacitors. In order to obtain high energy density, dielectric materials require high dielectric constant and high dielectric breakdown strength simultaneously. To satisfy these properties, 2-d ceramic nanosheets/polymer composites are emerging as suitable materials. In this study nanocomposites was composed of ferroelectric polymer poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and exfoliated 2-d nanosheet of mica. In the nanocomposites, mica which is exfoliated by intercalation of PVDF-HFP used to induce and maintain the polar phases of PVDF-HFP by forming hydrogen bonding between -OH groups of mica and -CF2 groups of PVDF-HFP molecules. Through X-ray diffraction spectroscopy (XRD), fourier-transform infrared spectroscopy (FT-IR) polar phases of PVDF-HFP were observed and enhanced dielectric properties of nanocomposites like permittivity, leakage current, P-E hysteresis loops, breakdown strength and energy density were measured. |
