Modeling Deformation Properties of Composite Polypropylene Threads Filled with Carbon Nanofibers

Mathematical models describing the dependence of the elongation at break of composite film threads produced from a polypropylene matrix filled with carbon nanofiber particles on the filler concentration were constructed using experimental data. The adequacy of the proposed models was proven. The obtained approximating functions were shown to have significantly different shapes for unoriented polypropylene-carbon-nanofiber composite threads and those subjected to orientational drawing. Explanations were given for these differences based on the positioning of the carbon nanofibers in the polymer matrix of the composite threads.