Abstract
The toughness of polypropylene (PP)/ethylene–propylene–diene monomer rubber (EPDM) blends containing various EPDM contents as a function of the tensile speed was studied. The toughness of the blends was determined from the tensile fracture energy of the side-edge notched samples. A sharp brittle–tough transition was observed in the fracture energy versus interparticle distance (ID) curves when the crosshead speed <102.4mm/min. It was observed that the brittle–ductile transition of PP/EPDM blend occurred either by reducing ID or by decreasing the tensile speed. The correlation between the critical interparticle distance and tensile deformation rate was compared with that between the critical interparticle distance and temperature for PP/EPDM blends.
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