Development, characterization, energy storage and interface dielectric properties in SrFe12O19 / epoxy nanocomposites

Publication date: 30 June 2017
Source:Polymer, Volume 120
Author(s): A. Sanida, S.G. Stavropoulos, Th. Speliotis, G.C. Psarras
A set of specimens consisting of an epoxy resin and ceramic SrFe12O19 nanoparticles were prepared varying the filler concentration. Specimens' morphology was examined by means of Scanning Electron Microscopy and x-Ray Diffraction spectra. Mechanical and thermal characterizations were conducted via Dynamic Mechanical Analysis and Differential Scanning Calorimetry respectively, in the temperature range 30–120 °C. Storage modulus increases substantially with filler concentration. The dielectric response of the nanocomposites was studied via Broadband Dielectric Spectroscopy in a wide frequency (10⁻¹-10⁷ Hz) and temperature (30–150 °C) range. Three relaxation processes were recorded in the spectra of all systems, attributed to both the filler and the polymer matrix. The energy storage efficiency of the prepared nanocomposites was examined in terms of the energy density as a function of temperature, frequency and filler concentration. Finally, a novel method for the determination of the real part of dielectric permittivity of the nanocomposites' interface is developed and tested.

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