Poly(L-lactic acid)/lithium ferrite composites: Electrical properties
authors Teixeira, SS; Gama, N; Cordeiro, T; Barros-Timmons, A; Dionisio, M; Graca, MPF; Costa, LC
nationality International
journal POLYMER
author keywords Lithium ferrite; Composites; Dielectric properties; Dielectric relaxation; Electromagnetic shielding
keywords CONDUCTING POLYMER COMPOSITES; DIELECTRIC-RELAXATION; LITHIUM FERRITE; STRUCTURAL-PROPERTIES; MAGNETIC-PROPERTIES; MOLECULAR MOTIONS; CRYSTALLIZATION; STEREOCOMPLEX; PERCOLATION; BEHAVIOR
abstract 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.
publisher ELSEVIER SCI LTD
issn 0032-3861
isbn 1873-2291
year published 2021
volume 230
digital object identifier (doi) 10.1016/j.polymer.2021.124100
web of science category 10
subject category Polymer Science
unique article identifier WOS:000694914200001
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