Effect of EVA-g-MAH on the Properties and Morphologies of Conductive Carbon Black/PA66 Composites
Tough conductive carbon black/nylon66(CCB/PA66)antistatic composites modified by maleic anhydride-grafted ethylene-vinyl acetate copolymer(EVA-g-MAH)were prepared by twin-screw extrusion and injection molding.The mechanical,melt flow,and antistatic properties of the composites were tested,and the fracture surface morphologies and crystallization behavior of the composites were observed and studied by scanning electron microscopy(SEM)and differential scanning calorimetry(DSC),respectively.The results showed that EVA-g-MAH has good compatibility with PA66.The antistatic properties of PA66 increased with the addition of CCB,however the toughness and processing ability of the composites decreased significantly.The addition of 10% EVA-g-MAH in the 8% CCB/PA66 blend resulted in a 75.4% and 45.1% increase in impact strength and elongation at break,respectively,while maintaining relatively higher tensile strength(50.5 MPa).When the mass fraction of EVA-g-MAH was 20%,the volume resistivity and surface resistance and of 8% CCB/PA66 decreased by 2 to 3 orders of magnitude to 4.3×107 Ω∙cm and 6.5×106 Ω,respectively,due to the selective location of CCB particles in 8% CCB/EVA-g-MAH/PA66.10% EVA-g-MAH enhanced the crystal formation of PA66 in the 8% CCB/EVA-g-MAH/PA6 composites,however 20% EVA-g-MAH inhibited the crystal formation of PA66.
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