▎ 摘　　要

Based on the industrialized reduced graphene oxide (RGO) product, polyetherimide (PEI)/RGO composite foam was prepared by a water-vapor-induced phase separation process by incorporation of polysiloxane (SI) as a compatibilizer. It was found that PEI/SI molecules were intercalated into the RGO layers through strong interfacial interaction and RGO with increased layer thickness was uniformly distributed in the PEI matrix. The composite foam possessed a homogeneous spherical-like cell structure with narrow cell size distribution and low apparent density. In the range of 0-1 wt% RGO-SI content, the area under the stress-strain curves increased dramatically, indicating the significantly increased toughness of the composite foam, while the tensile strength reached a maximum of 14.5 MPa at 1 wt% RGO-SI as a result of the reinforcing effect of RGO-SI on the foam. The addition of RGO-SI led to a remarkable increase in T-g. Compared with neat PEI foam, the thermal degradation temperature and char yield of the composite foam clearly increased, while in the range of 0.5-3 wt% RGO-SI a high storage modulus was maintained at high temperature, reaching about 300 MPa at 200 degrees C, indicating a remarkable improvement of the thermal mechanical stability of the foam. (c) 2018 Society of Chemical Industry