8/3/2023 0 Comments Arburg copy log 5.0![]() ![]() Typically, more than 20 wt% of conductive filler is required for generating good conductivity. Ĭarbon-based fillers such as graphite, carbon fibers, carbon nanotubes, and especially carbon black are the most common conductive fillers. Nearly all neat polymers are not inherently ESD safe and must be modified by electrically conductive fillers. Otherwise, those electronic components could be easily damaged by sparks resulting from electrostatic discharge (ESD). For example, electrically conductive or static dissipative polymer composites are needed for handling and packaging electronic components. Composites allow tailoring material properties of interest, which is needed due to various product requirements in the polymer industry. Finally, it was found that an injection pressure reduction of 25.8% could be achieved with MIM for molding a complex box-shaped part in a consistent and reliable fashion.Įngineering polymer composites have been actively researched and developed for many applications. Increasing the supercritical fluid (SCF) dosage and weight reduction of foamed samples resulted in swirl marks on the part surface, making the tiger-stripes less noticeable. A melt flow and transition model was proposed to explain the unique, irregular “tiger-stripes” exhibited on the surface of solid test bars. Standard tensile tests showed that, while the ultimate strength and elongation at break were lower for the foamed test bars at 4.0–11.4% weight reduction, their specific Young’s modulus was comparable to that of their solid counterparts. ![]() The fine and uniform cellular structure suggests that the PC composite is a suitable material for foaming applications. A scanning electron microscope (SEM) was used to examine the microstructure at the fractured surface of the tensile test bar samples. Conventional solid injection molding (CIM) and microcellular injection molding (MIM) of a highly filled polycarbonate (PC) composite with glass fibers and carbon black were performed for molding ASTM tensile test bars and a box-shape part with variable wall thickness. ![]()
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