Effect of Temperature on the Mechanical Properties of the Highly Filled Composites Based on Polypropylene and Ground Rubber Scrap

Abstract

The mechanical properties of the dispersion-filled composites based on polypropylene (PP) and ground rubber scrap are studied in the temperature range from 40 to 120 °C. The content of the rubber particles is varied from 40 to 80 wt %. The peculiarities of the realization of a brittle-to-ductile or ductile-to-ductile transition in the composites are determined. The change in the deformation behavior occurs through the intermediate tension of the composite with the formation of several delocalized necks in the range of the filler concentrations. The negative effect of large particles during macrouniform tension of rubber plastics is shown for the first time. Their presence in the composite composition facilitates its fracture while the matrix polymer is underloaded (the effect of a single defect).