UTILIZATION OF SAWDUST FIBRES IN HIGH-DENSITY POLYETHYLENE COMPOSITES: A SUSTAINABLE APPROACH TO PLASTIC WASTE RECYCLING

Abstract The environmental issues related to plastic waste and sawdust disposal have generated interest in developing composites using natural fibers. This study examines how to make sawdust-reinforced high-density polyethylene (HDPE) composites from recycled food plastic takeaway containers and disposable water cups. The sawdust underwent alkaline treatment with sodium hydroxide to improve the bond between the fiber and matrix. Composites were created using a two-roll mill and compression molding with different fiber loadings (0–50 wt%). We evaluated mechanical properties like tensile strength, flexural strength, modulus, and impact resistance according to ASTM standards. The results indicate that a 30 wt% fiber loading achieved the best mechanical performance. The alkaline-treated fibers showed better mechanical properties than untreated fibers because of improved bonding at the interface. This research highlights the potential of sawdust as a reinforcing agent in polymer composites and offers an eco-friendly option for reusing plastic and wood waste.