Abstract
UDC 541.64
The article deals with the investigation of the effect of the concentration of fillers – oxides Al2O3 and Fe2O3, on the electrical conductivity of polypropylene (PP). It is shown that a larger quantity of a filler leads to an increase in optical density value of the absorption bands. Based on the comparative analysis of infrared spectra and temperature dependence of the resistivity of the investigated composites it is revealed that the introduction of polypropylene oxides of aluminum and iron (III) does not change the structure of the matrix. It is assumed that the composite containing 1% α-Al2O3 and 3% α-Fe2O3 gets an increased rigidity of the polymer units, leading to an increased resistance in the high temperature range. With higher concentrations of the filler (2% α-Al2O3 and 5% α-Fe2O3) the number of contacts on the boundary filler – polymer is predominant, which leads to a significant increase in electrical conductivity of this composite. An optimal ratio has been determined between the composite filler and matrix, due to which there is a significant increase in electrical conductivity.
Keywords: composite, polypropylene, electrical conductivity, polymer.