Polypropylene grafted multi-wall carbon nanotubes (PP-g-MWNT) were prepared through radical reactions in the PP/MWNT suspension irradiated with ultraviolet (UV) for 24 h in the presence of initiator. The existence of PP-g-MWNT structure was confirmed and characterized by means of transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR), Wide angle X-ray diffraction (WAXD), Thermo gravimetric analysis (TGA). The results showed that PP chains wrapped onto the MWNT of shorter length. The absorptions and diffractions of PP characteristics were found on the FTIR spectrum and WAXD profiles of the PP-g-MWNT, which were indicative of the occurrence of graft reaction. WAXD results also suggested that the grafted PP has different crystal structure from that of the PP control. TGA results showed that the degree of grafting PP onto MWNT was about 10.4wt%. No significant changes were found in the D line and G line of the Raman spectra of the PP-g-MWNT, suggesting that MWNT structure remained unchanged after the grafting reactions.
