Electrical Conductivity of Lignocellulose Composites Loaded with Electrodeposited Copper Powders. Part III. Influence of Particle Morphology on Appearance of Electrical Conductive Layers

摘要

The electrical conductivity of the system based on lignocellulose (LC) biopolymer matrix filled withelectrodeposited copper powder has been studied. Galvanostatically produced copper powder, havinghighly porous, highly dendritic particles with high values of specific area was used as filler. Volumefraction of the electrodeposited copper powder was varied from 2.0-29.8 vol%. Analysis of the mostsignificant properties of prepared composites and its components included measurements of electricalconductivity, impedance spectroscopy (IS) behavior, structural and morphological analysis. Thecomposite preparation conditions allowed the formation of a random distribution of metallic particlesin the polymer matrix volume. It was shown that percolation threshold depends on both particle shapeand type of spatial distribution. IS measurements have shown that particle morphology havingpronounced grain boundaries has great effect on appearance of electric conductive layers, i.e.昺ovementof percolation threshold towards lower filler volume fractions. IS response of thecomposites showed existence of electrical conductive layers, each having different resistivity whichincreases towards interior of the composite.