Electrical and mechanical properties of graphite/maleic anhydride grafted polypropylene nanocomposites

Add time:08/16/2019    Source:sciencedirect.com

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 10 wt.% of MA-PP having a constant GNP content of 8 wt.% and at 20 wt.% of GNP having a constant MA-PP content of 5 wt.%, whereas a decrease in tensile strength and flexural properties was observed at 20 wt.% 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 106 Ω cm regardless of the direction of the resin flow could be obtained by adding more than 20 wt.% of GNP when the MA-PP content was 5 wt.%. 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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