Electric Conductivity of Electrolytic Copper Powder Filled Poly(Lactide-co-Glycolide) Composites
AuthorsPavlović, Miroslav M.
Pantović, Radoje V.
Nikolić, Nebojša D.
Article (Published version)
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This manuscript presents the results of investigating the properties of composite materials having poly(lactide-co-glycolide) (PLGA) matrix filled with electrolytically produced copper powder whose particles have a highly developed branched structure. The volume fraction of the copper powder used as a filler for the preparation of the composite was varied from 0.4 to 7.2 vol. %. The samples were prepared at 140 °C by hot molding injection. The effect of the morphology of electrolytically obtained copper powder on the appearance of the percolation threshold and on the conductivity of the composites was studied. Characterization included impedance spectroscopy (IS) measurement of electric conductivity and scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and Fourier-transform Infrared Spectroscopy (FTIR) morphological analysis. Electric conductive pathways were formed throughout the entire volume of the composites, where their formation was purely stochastic... in all the dimensions. The percolation threshold was 2.72 vol.%, which is significantly lower than the one stated in the literature for similar composites, since these kind of composites are investigated for the first time. This property can be attributed to the use of a filler of different, diverse morphologies.
Keywords:electrical conductivity / biodegradable composite material / Poly(lactide-co-glycolide) / electrolytic copper powder / FTIR / hardness
Source:International Journal of Electrochemical Science, 2019, 9825-9837