Electrical and mechanical properties of graphite/maleic anhydride grafted polypropylene nanocomposites
2013
Roh, Jeong U | Ma, Sung Won | Lee, Woo Il | Thomas Hahn, H. | Lee, Dong Woo
The aim of this study was to investigate the effects of adding maleic anhydride grafted polypropylene (MA-PP) and graphite nanoplatelets (GNPs) into polypropylene. The tensile strength and flexural properties of the GNP/PP composite were enhanced with an increase in the MA-PP content and the GNP content. The maximum increase of mechanical properties was shown at 10wt.% of MA-PP having a constant GNP content of 8wt.% and at 20wt.% of GNP having a constant MA-PP content of 5wt.%, whereas a decrease in tensile strength and flexural properties was observed at 20wt.% of MA-PP. The impact strength was decreased by increasing the MA-PP content and the GNP content. The electrical resistivity of the GNP/PP composite exhibited an anisotropic characteristic due to the direction of the injection molding flow. Electrical resistivity of less than 10⁶Ωcm regardless of the direction of the resin flow could be obtained by adding more than 20wt.% of GNP when the MA-PP content was 5wt.%. The differential scanning calorimetry results suggest that an increase of the GNP content makes it act as a nucleating agent and thus causes an increase in the crystallinity of the PP.
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