▎ 摘　　要

The sulfonation of reduced graphene oxide (SRGO) by the aryl diazonium salt of sulfanilic acid was focused to examine the enhancement effect on the mechanical properties of poly styrene-acrylonitrile (SAN). The SAN was prepared by surfactant-free emulsion copolymerization using a cationic initiator. By mixing sulfonated RGO ( SRGO) into the SAN polymer matrix, positively-charged SAN particles were attracted to the negatively-charged surfaces of SRGO sheets via electrostatic interactions. The storagemodulus of SAN-SRGO increased to 46% at 4 wt% SRGO loading. This improvement is attributed to strong interactions between sulfonated groups on the surface SRGO and the nitrile groups of SAN. (C) 2014 Society of Plastics Engineers