• Costa, Luís Cadillon
• Graça, Manuel P. F.
• Barros-Timmons, A.
• Teixeira, S. Soreto
• Andrade, Maria Madalena Dionísio
• Cordeiro, Teresa
• Gama, Nuno

Abstract

<p>Composites of lithium ferrite, LiFe₅O₈ (LFO) particles, dispersed in the biopolymer poly (L-lactic acid) (PLLA) were prepared by solvent casting in concentrations from 0 to 19.5 wt%, which were characterized by thermal analysis (TGA/DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy and impedance spectroscopy (IS). As neat PLLA, all obtained composites are semi-crystalline, but the crystallinity decreasing with percentage LFO increase. Moreover, a good dispersion of LFO particles was found, with no interactions with the polymeric matrix. For the lower LFO content (3.5 wt%), dynamical relaxation processes were probed by IS, allowing to disclose subtle differences relative to the neat matrix. Above that concentration, the conductivity dominates and follows the percolation law above a quite low volume concentration of conductive particles (5.45%_v/v). Therefore, depending on the LFO content different applications can be envisaged: energy storage for low concentrations and electromagnetic radiation shielding for concentrations above the percolation threshold.</p>

Topics

• impedance spectroscopy
• dispersion
• scanning electron microscopy
• x-ray diffraction
• composite
• transmission electron microscopy
• thermogravimetry
• solvent casting
• differential scanning calorimetry
• casting
• Lithium
• crystallinity