Multifractal analysis of tensile toughness and filler dispersion for polypropylene-CaCO3 composites

► Dispersion of CaCO3 microparticles into PP was studied by multifractal theory. ► Fracture surfaces morphology were described by multifractal theory. ► Multifractal spectra parameters were related to mechanical behavior of composites. ► Composites with MAPP displayed reduced Δα values related to a brittle fracture.