Functionalized graphene sheet/polyurethane nanocomposites: Effect of particle size on the physical properties

The percolation threshold in the nanocomposite of functionalized graphene sheet (FGS) and thermoplastic polyurethane (TPU) reduced effectively by increasing the particle size of FGS. That is the FGS with average size of 8.3 μm has the percolation threshold at 0.4 wt% in the nanocomposite of TPU, whereas it was more than 1.4 wt% when the FGS size was 2.4 μm. The effect of FGS size on mechanical and other properties were also examined.