The composites of polypropylene (PP)/ Kevlar pulp (PPTA-pulp) and PP/PPTA-pulp/ maleic anhydride-grafted-polypropylene (MAH-g-PP) were prepared by using twin-screw extruder. The mechanical properties and structure of PP/ PPTA-pulp and PP/PPTA-pulp/MAH-g-PP composites were investigated. Differential scanning calorimeter (DSC) and parallel plate rheometer were used to measure the crystallization behavior and rheological properties

and the fracture of the composites were characterized by using scanning electron microscopy (SEM). The results showed that with increasing content of PPTA-pulp

the tensile strength and flexural modulus of the composites were increased

while the elongation and notch impact were decreased sharply. PPTA-pulp played a role as nucleating agent of polypropylene. Maleic anhydride-grafted-polypropylene (MAH-g-PP)

a compatibilizer

can advance the affinity between PPTA-pulp and PP molecular and improve the interfacial action. It was found that the storage modulus

loss modulus and mechanical performance of PPTA-pulp/ MA-g-PP/PP composites were better than those of PPTA-pulp/PP composites.