Abstract
Binary blends composed of polypropylene (PP) and natural rubber (NR) or carboxylated acrylonitrile butadiene rubber (XNBR) were produced in batch-type melt compounding process. The rubbers used as toughening agents were introduced into PP in up to 20 wt% in their dry and latex forms. Structure-property relationships of the blends were studied. Both NR and XNBR were homogenously dispersed in the PP matrix: XNBR in microscale, NR in the submicronic scale. Fracture toughness and energy, determined on notched Charpy specimens, were improved by rubber toughening, however, at the cost of stiffness and strength, determined in tensile tests. NR toughened blends were superior to blends containing XNBR with respect to impact resistance. The introduction of rubbers in latex form resulted in slightly better mechanical performance compared to addition in dry form.
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