Effect of titanium dioxide nanoparticles on mechanical properties of vinyl ester-based nanocomposites

The incorporation of nanoparticles into a polymer can lead to a considerable improvement of mechanical properties. Especially, the toughness and stiffness of the nanocomposite can be enhanced at the same time. Therefore, a homogeneous distribution of fillers within the matrix is required. In this research study, the feasibility of improving polymer composites was investigated using 21nm titanium dioxide nanoparticles in a vinyl ester resin. The nanocomposites were processed by shear mixing and ultrasonication at different filler concentrations (1, 2.5, and 5wt%). Also, a polymeric coupling agent was employed to strengthen the interface between filler and resin by forming strong chemical bonds. Changes in mechanical properties were examined through a variety of tests. Results indicate an enhancement in the vinyl ester composite mechanical properties due to the addition of small fraction of titanium dioxide particles. It was concluded that the highest mechanical properties could be achieved at an optimal titanium dioxide fraction.