Abstract: The mechanical properties of polypropylene/waste tire power composites were studied. The compatibility between the components was improved by shucking off sulfur and free radical reaction. It was found that the tensile strength and elongation at break were decreased with increasing tire power. When the tire content was 70 wt%, the tensile strength decreased from 37 MPa to 7 MPa, the elongation at break from 108 % to 35 %. Impact strength increased first and then decreased as content of tire power increased. When the content was 20 %, impact strength was 14 kJ/m2. When modified tire power was employed, these mechanical properties were improved. When the tire powder content was 30 wt%, the impact strength and elongation at break were 18.5 kJ/m2 and 320 %, respectively.

Key words: reused tire power, polypropylene, composite