Effect of Surface Modified Nano-Calcium Carbonate on the Properties of Polyethylene/Nano-CaCO3 Nanocomposites


  • Haydar U. Zaman
  • Ruhul A. Khan



In this study, nanocmposites of high-density polyethylene (HDPE)/linear low-density polyethylene (LLDPE) filled with unmodified nano-calcium carbonate (denoted as UnCC) and surface modified nano-calcium carbonate (indicated as MnCC) were manufactured by melt-mixing method then compression molding. The effect of isopropyl tri-(dioctylpyrophosphato) titanate (JN114) modified of nano-calcium carbonate (nCC) concentration on the mechanical, morphological and flow properties of the nanocomposites were studied. Three compositions of HDPE/LLDPE/nCC nanocomposites were prepared in a corotational twin-screw extruder with nCC content of 5, 10, 15, and 20 wt%. The results of scanning electron microscopy (SEM) showed that the JN114 treatment of nCC enhanced the interfacial adhesion between the filler and the matrix, indicating the improvement in the compatibility between HDPE/LLDPE and nCC. Measurements of mechanical properties showed that the tensile fracture strength (sb) of the modified nCC filled polyethylene composite was significantly higher than that of the unmodified composite, especially in the case of higher filler content. The tensile elastic modulus and impact strength was increased with increasing weight fraction (f) of the fillers. Furthermore, the melt flow rate (MFR) of the nanocomposite materials was measured. It was found that the MFR decreased with the addition of f.