Abstract
This article presents a comparative study on the effects of nano α-alumina on thermal degradation and dynamic mechanical properties of polypropylene (PP) nanocomposites. In this respect, two types of composites were prepared, with dispersant and without dispersant. Thermogravimetric analysis of both composites showed a drastic shift in the weight loss curve toward higher temperature, which led to reduction in the PP heat release rate in both composites. Differential scanning calorimetry results showed that the crystallinity of the nanocomposites was increased especially in the presence of dispersant. The storage modulus of the nanocomposites was found to be higher than that of pure PP, because nanofiller increased the stiffness of the nanocomposites. The glass transition temperatures of the nanocomposites were not significantly changed and damping factor of the nanocomposites was decreased.
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