This study explores the impact of incorporating a blend of alumina and talc, ranging from 1 to 7%, into high-density polyethylene (HDPE) to modify its structural, rheological, and mechanical properties. Comparative evaluations with HDPE/Alumina and HDPE/Talc composites were conducted. The dual-filler combination was achieved through dry grinding, followed by melt processing with a Brabender plastograph. FTIR spectroscopy analysis of HDPE/ (alumina + talc) composites revealed interactions between aluminum and oxygen, with a peak at 700 cm-1 indicating alumina integration into the HDPE matrix, influencing composite properties. Impact strength decreased with talc inclusion but significantly improved with alumina. Notably, a 5% blend of HDPE/(alumina-talc) fillers exhibited the highest impact resistance. Tensile stress showed peaks at 1% talc content and a 3% filler mixture, emphasizing synergistic effects and talc’s superiority over alumina. Synergism in elongation at break was observed for HDPE/ (alumina + talc) composites. Additionally, HDPE/Alumina composites displayed the highest modulus of elasticity, while HDPE/(Alumina + Talc) composites had the highest melt flow index. Surface treatments promoted uniform filler dispersion within the HDPE matrix, enhancing mechanical properties. Overall, composites with binary fillers harnessed synergistic effects, combining advantages from both components.
