Pyrolyzed Soybean Hulls as a Potential Conductive Filler in High-Density Polyethylene / Carbon–Black Composites

Abstract

Electrically conductive polymer composites have a variety of applications in electronics and packaging. Current research focuses on environmentally friendly alternatives to carbon-based fillers, such as Carbon Black (CB), and other inorganic fillers. Biochar, i.e., pyrolyzed biomass, has emerged with great potential due to its high carbon content and thermal stability. This study investigates the feasibility of PSBH as a conductive filler in HDPE/CB composites to determine its effectiveness in enhancing electrical properties. HDPE/PSBH composites were prepared through melt mixing, and their electrical conductivity was analyzed using a four-point probe method. The influence of filler composition, dispersion, and processing parameters on conductivity was evaluated. Results indicate that while PSBH alone has limited conductivity, its combination with CB improves composite performance, offering a potential pathway toward partially bio-based conductive materials. The findings contribute to the development of sustainable polymer composites by integrating agricultural waste-derived carbon materials.