Effect of both uncoated and coated calcium carbonate on fracture toughness of HDPE/CaCO₃ nanocomposites

Abstract

Abstract The main goal of this research is to investigate the effect of nano‐CaCO 3 coated with different content of stearic acid on fracture toughness of HDPE/CaCO 3 nanocomposite. For this purpose, HDPE/10 vol % CaCO 3 nanocomposites were made using a twin‐screw mixer–single‐screw extruder. Nanocomposite standard samples were prepared via injection molding method. Three‐point bending tests and microscopic evaluations were performed. The results of fracture toughness test showed that the addition of uncoated nano‐CaCO 3 to HDPE causes to decrease fracture toughness, but it can be increased slightly as stearic acid content added. Also the results showed that the stress whitening zone width depends strongly on both CaCO 3 and stearic acid content. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 3688–3694, 2007