This work concerns to the study of the mechanical, thermal and rheological behavior of the nanocomposite HMSPP-high melt strength polypropylene (obtained at a dose of 12.5 kGy) and a Brazilian bentonite clay from State of Paraiba (PB), known as "Chocolate" in concentrations of 5 and 10 % by weight in comparison with one American clay, Cloisite 20A. The compatibilizer agent based on maleic anhydride grafted polypropylene, known as PP-g-MA, was added at 3 % weight concentration through the melt intercalation technique using a twin-screw extruder, and afterwards, the specimens were prepared by injection process. The mechanical behavior was evaluated by strength, flexural strength and impact tests. The thermal behavior was evaluated by the differential scanning calorimetry (DSC) and thermogravimetry (TGA). The rheological behavior was evaluated in parallel-plate rheometer. The morphology of the nanocomposites was studied by the technique of scanning electron microscopy (SEM). The organophilic bentonite and the nanocomposites were characterized by X-ray diffraction (XRD) and infrared (FTIR). Results of mechanical tests showed a 9 % increase in the tensile strength and Young's modulus for the nanocomposites HMSPPC, with Cloisite 20A clay. The nanocomposite HMSPPB 10 %, with "chocolate" clay obtained a 50 % increase in the impact strength in the izod impact test.

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