Processability, mechanical properties, and electrical conductivities of carbon black-filled ethylene-vinyl acetate copolymers

Abstract

The objective of this study was to investigate the processability, mechanical properties, and electrical properties of carbon black-filled ethylenevinyl acetate (EVA) copolymers with different melt flow indexes (MFIs) and vinyl acetate (VA) contents. The effects of carbon black on maximum temperature, equilibrium torque, equilibrium viscosity, and work energy were characterized in a Haake torque rheometer. These properties were found to increase with an increase in carbon black concentration. MFI was found to be the important factor in determining processing properties of the three different EVA resins. Mechanical properties, including tensile modulus, tensile strength at break, and elongation at break were evaluated and the results showed that tensile modulus was dominated by VA content. MFI was the primary factor influencing tensile strength and elongation at break. Volume and surface resistivity of blends were also studied. EVA with higher MFI and higher crystallinity provided a lower percolation concentration. Bound polymer could be used to explain the differences in viscosity and percolation between EVAs at different molecular weights.

Tensile and impact properties of carbon filled nylon‐6,6 based resins

“…These unusual results for carbon black have been reported elsewhere for carbon black in ethylene vinyl acetate. 36 Figure 6 illustrates the strain at ultimate tensile stress results for composites filled only with varying amounts of the single fillers in nylon-6,6. For the single fillers, the strain at ultimate tensile stress results follow the same trends as the ultimate tensile stress.…”

Dielectric, Thermal, and Mechanical Properties of Acrylonitrile Butadiene Styrene Reinforced with Used Tires

“…At high frequency (1 × 10 7 Hz), these differences decrease to one order of magnitude (1 × 10 −8 S/cm for pure ABS and 1 × 10 −7 S/cm for ABS/GTR‐70%). The increase in conductivity with the concentration of GTR can be attributed to the presence of carbon black in used tires 37,38. Furthermore, these values evidence that variation of conductivity with the frequency is important in this temperature regime 39…”

MWNT/PEG grafted nanocomposites and an analysis of their EMI shielding properties

“…Thus, the formation of conducting networks is slowed and there is a lower quantity of MWCNTs per unit area, i.e., the MWCNTs have a small surface area [24,25].…”