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Organo-montmorillonite(OMMT)was introduced into SEBS-g-MA toughened poly(phenylene oxide)/polyamide-6(PPO/PA6)blends simply by melt extrusion.The addition of OMMT could decrease the size of dispersed PPO domains in PA6 matrix and melt viscosity of the toughened PPO/PA6 nanocomposites.For nanocomposites with exfoliated OMMT,OMMT induced more toughening particles with the optimized size,thus elastomer-OMMT synergistic toughening was achieved in the PPO/PA6 nanocomposites.Consequently,PPO/PA6 nanocomposites with high tensile strength,excellent impact performance,improved HDT and good processibility were obtained.