N-doped reduced graphene oxide/waterborne polyurethane composites prepared by in situ chemical reduction of graphene oxide

In this study, N-doped reduced graphene oxide/waterborne polyurethane (NRGO/WPU) composites were prepared by in situ chemical reduction of graphene oxide in an aqueous solution system. The morphology, structure, electrical conductivity, electromagnetic shielding, as well as thermal stability.of the NRGO/WPU composites were characterized. The results show that simultaneous chemical reduction and N-doped functionalization of graphene oxide were achieved using diethylenetriamine as a reducing agent and N-doping agent. The introduction of NRGO could endow the WPU with quality electromagnetic interference shielding effectiveness (EMI SE). The composites with 12 wt% NRGO content exhibited the EMI SE of 28.3 dB at 9 GHz. Attributable to the uniform distribution of NRGO in the WPU matrix and its formed network structure, the NRGO/WPU composites had a better electrical conductivity compared with virgin WPU. TG and DTG indicated that the NRGO/WPU composites had a better thermal stability than virgin WPU. (C) 2016 Published by Elsevier Ltd.