Hemmatollah Sheikhrobati - Department of Polymer Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran
Mohammad Reza Saeb - Department of Resin and Additives, Institute for Color Science and Technology,
A Azizi - Department of Polymer Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran

Natural rubber (NR) nanocomposites are manufactured at three various contents of calcium carbonate(CA) nanofiller. To achieve better fillermatrixinteraction, it was decided to choose abiofiller with porous structure which could has been employed in NR-base nanocomposites comparative with CA nanofillers. First of all, theeggshell nanofiller was chosen and then the its surface area was modified with stearic acid toameliorate the wetability toward NR matrix.Afterwards, the wetability of both sorts of nanofillers has been studied through several tests. The results are representive of this fact that employing eggshell biofiller can ultimately affect both the mechanical and morphological traits of NR nanocomposites as well as CA-basednanocomposites does. Scanning electron microscopy was utilized on the prepared samples as an indication of nanofiller distribution and dispersion within the elastomeric matrix.