Modeling the Effects of Filler Network and Interfacial Shear Strength on the Mechanical Properties of Carbon Nanotube-Reinforced Nanocomposites

This modeling paper describes the roles of filler network and imperfect interfacial adhesion between polymer matrix and nanoparticles in the tensile modulus and yield strength of polymer/carbon nanotube (CNT) nanocomposites (PCNT). The percolation threshold (phi p) is assumed by the aspect ratio of the CNT; also, both the critical length of the nanotubes. Crucial for effective stress transfer from matrix to filler (L-c). and the interfacial shear strength (tau) reflect the incomplete interfacial adhesion. Two known micromechanics models are used to examine the influences of these parameters on the tensile modulus and yield strength of PCNT. The lowest ranges of phi p and L-c produce the highest levels of mechanical properties, while tau cannot affect the mechanical performance. The main reasons for these occurrences are explained in order to clarify the roles of the filler network and interfacial adhesion in the modulus and strength of PCNT.