Abstract-The goal of this work is to modify surface of calcium carbonate nanoparticles with silica (CaCO 3 @SiO 2 ) via sol-gel process, and to investigate the influence of CaCO 3 @SiO 2 on mechanical properties and fracture behavior of poly(lactic acid) nanocomposite. Modified CaCO 3 @SiO 2 nanoparticles were prepared with different Si:Ca ratios. It is found that the Si/Ca wt% was increased with respect to the Si:Ca mole ratio used in the reaction. Incorporating CaCO 3 @SiO 2 of 5 wt% increased elastic modulus, %elongation at break and notched impact strength of PLA nanocomposites. These properties of hydrophilic-modified CaCO 3 -poly(lactic acid) nanocomposite was increased with respect to the increasing of SiO 2 content on the surface of CaCO 3 nanoparticles. This implies that better compatibility between PLA matrix and nano-fillers was achieved after modification surface of CaCO 3 with SiO 2 layers.Index Terms-Nanocomposite, poly(lactic acid), calcium carbonate nanoparticle, silica, sol-gel process.
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