Study of the correlation between matrix characteristics and reinforcing role of MWNTs: Investigation of tensile and fractural properties |
Paper ID : 1484-UFGNSM-FULL |
Authors: |
Abstract: |
In the recent years Multi-walled carbon nanotubes (MWNTs) have stimulated great interest in the field of polymer composite materials, owing to their marvelous multi-functional characteristics such as very large aspect ratio and high stiffness. While different types of resins are available in the market, very little studies have been performed on the compatibility of different types of polymers and MWNTs. This study aims to understand the link between the nature of polymer as the base material for nanocomposite and reinforcement role of MWNTs. For this purpose, three common polymers, with high industrial applications, namely vinylester, polyester and epoxy were chosen. The standard specimens were prepared for both neat and reinforced resins using 0.5wt% of MWNTs, and were tested to investigate their tensile and fracture behavior. The results indicated that while for vinylester and polyester resins, there was no improvement in elastic modulus, for epoxy resin the elastic modulus increases by 5.6% with addition of MWNTs. The ultimate strength of all three nanocomposites was less than that of neat resins. The fracture toughness of all three nanocomposites, which were measured utilizing single-edged notch bend (SENB) specimens, showed considerable improvement compared to those of neat resins. The trend of obtained results has been justified thoroughly using micromechanical mechanisms which influence the mechanical behavior of pure polymers and nanocomposites. In addition, several scanning electron microscopy (SEM) pictures were taken from the fracture surfaces to evaluate the surface features, fracture mechanisms and the state of dispersion of filler. |
Keywords: |
Tensile properties, Fracture toughness, Thermosetting polymer, MWNTs |
Status : Paper Accepted (Poster Presentation) |