An innovational method that poly(styrene-co-maleic anhydride)(SMA),a compatibilizer of immiscible nylon6/polystyrene(PA6/PS) blends,was first reacted with carbon black(CB) and then blended with PA6/PS,has been employed to prepare the PA6/PS/(SMA-CB) composites of which CB localized at the interface.In PA6/PS/CB blends,CB was found to preferentially localize in the PA6 phase.However,in the PA6/PS/(SMA-CB) blends,it was found that CB particles can be induced by SMA to localize at the interface.The electrical porperties of PA6/PS/(SMA-CB) composites were investigated.The results showed that the composites exhibited distinct triple percolation behavior,i.e.the percolation is governed by the percolation of CB in SMA phase,the continuity of SMA-CB at the interface and the continuity of PA6/PS interface.The percolation threshold of PA6/PS/(SMA-CB) was only 0.15 wt%,which is much lower than that of PA6/PS/CB.Moreover,the PTC(positive temperature coefficient) intensity of PA6/PS/(SMA-CB) composites was stronger than that of PA6/PS/CB and the negative temperature coefficient(NTC) effect was eliminated.The electrical properties of PA6/PS/(SMA-CB) were explained in terms of its special interface morphology:SMA and CB localize at interphase to form the conductive pathways. An innovational method that poly (styrene-co-maleic anhydride) (SMA), a compatibilizer of immiscible nylon 6 / PS blends, was first reacted with carbon black (CB) and then blended with PA6 / PS, has been was used to prepare the PA6 / PS / (SMA-CB) composites of which CB localized at the interface. In PA6 / PS / CB blends, CB was found to be preferentially localize in the PA6phase.However, in the PA6 / PS / SMA-CB) blends, it was found that CB particles can be induced by SMA to localize at the interface. The electrical porperties of PA6 / PS / (SMA-CB) composites were investigated. The results showed that the composites exhibited distinct triple percolation The iethe percolation is governed by the percolation of CB in SMA phase, the continuity of SMA-CB at the interface and the continuity of PA6 / PS interface. The percolation threshold of PA6 / PS / (SMA-CB) was only 0.15 wt%, which is much lower than that of PA6 / PS / CB. Moreover, the PTC (positive temperature coefficient) intensity of PA6 / PS / (SMA-CB) composites ites was stronger than that of PA6 / PS / CB and the negative temperature coefficient (NTC) effect was eliminated. electrical properties of PA6 / PS / (SMA-CB) were explained in terms of its special interface morphology: SMA and CB localize at interphase to form the conductive pathways