Fabrication and properties of stack-like functionalized graphene nanoribbons/TPU composite films

The stack-like functionalized graphene nanoribbons (SF-GNRs)/thermoplastic polyurethane (TPU) composite films were obtained by solution coating film method on a coating machine. FTIR, XRD, XPS, TEM and FE-SEM were used to characterize the structure of SF-GNRs. Meanwhile, by means of oxygen transmission rate, volume resistivity test, and the observation of surface morphology, we studied the effect of SF-GNRs with different mass fractions on the barrier and antistatic properties of TPU composite films. The results show that the SF-GNRs with high surface area are evenly dispersed within TPU matrix. As a result, when the mass fraction of SF-GNRs is 1.0%, the oxygen transmission rate of SF-GNRs/TPU composite films reduces by 67.76%, compared with that of the neat TPU film. Barrier property has obvious improvement. In addition, as SF-GNRs mass fraction reaches to 1.0%-1.5%, SF-GNRs/TPU composite films appear electrical percolation behavior which exhibit the excellent room temperature conductivity.