Poly(L-lactic acid)/lithium ferrite composites: Electrical properties

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

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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.

Original languageEnglish
Article number124100
Publication statusPublished - 16 Sept 2021


  • Composites
  • Dielectric properties
  • Dielectric relaxation
  • Electromagnetic shielding
  • Lithium ferrite


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