کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5178008 | 1502486 | 2017 | 9 صفحه PDF | دانلود رایگان |
- SrFe12O19/epoxy resin nanocomposites were successfully manufactured and studied varying the filler concentration.
- The incorporation of the nanoparticles enhances significantly both the mechanical and the dielectric properties.
- Recorded relaxations: interfacial polarization, glass to rubber transition, and re-arrangement of polar side groups.
- Relaxation dynamics indicate two different “interaction-regimes”, varying the filler content.
- Energy density increases substantially reaching up to more than 30 times the energy stored in the neat matrix.
- A method for the determination of the interface's real part of dielectric permittivity is demonstrated and tested.
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 (10â1-107 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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Journal: Polymer - Volume 120, 30 June 2017, Pages 73-81