Abstract
The thermal and flame retardancy properties of polypropylene/fullerene(PP/C60) nanocomposites were investigated by thermogravimetric analysis (TGA),differential scanning calorimetry (DSC) and cone calorimetry with theC60 loading varied from 0.5 to 2% by weight. Dispersion ofC60 in the PP matrix was characterized by transmission electron microscopy (TEM) andoptical microscopy (OM). TGA and DSC results showed that the presence ofC60 could remarkably enhance the thermal property and cone calorimeter measurements suggested thatC60 could to some extent reduce the flammability of PP, with a significant reduction in peak heatrelease rate and a much longer time to ignition. Furthermore, the larger the loading level ofC60, the better the flame retardancy property ofPP/C60 nanocomposites. The flame retardation mechanism and corresponding model wereproposed with the help of rheological measurements, TEM and x-ray diffraction.C60 reduced the flammability of PP by trapping free radicals in the gas phase and in situforming a gelled-ball crosslink network to improve the flame retardancy of PP in thecondensed phase. Finally, this suggested mechanism was supported by the results ofadvanced rheological extended systems (ARES), gel content, infrared spectrum, OM, andatomic force microscopy (AFM) measurements.
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