用熔融共混的方法分别制备了两相复合材料MWNT(多壁碳纳米管)/LDPE、MWNT/PS和多相复合材料MWNT/LDPE/PS,以上3种复合材料的导电渗滤阈值分别为8%(wt,下同)、6%和4%。SEM观察发现,MWNT选择性的分布于MWNT/LDPE/PS复合材料的LDPE相中。当LDPE/PS的质量比为50/50时,聚合物基体形成双连续结构,由于双重渗滤的作用,复合材料的渗滤阈值降低到4%。 MWNT / LDPE / MWNT / LDPE / PS / MWNT / LDPE / PS composites were prepared by melt blending. The conductive percolation thresholds of the three composites were 8% (wt, the same below), 6% and 4%. SEM observation showed that the MWNTs were selectively distributed in the LDPE phase of MWNT / LDPE / PS composites. When the weight ratio of LDPE / PS is 50/50, the polymer matrix forms a bicontinuous structure, and the percolation threshold of the composite is reduced to 4% due to the double diafiltration.