Simultaneous improvement on the electromagnetic interference (EMI) shielding and flame retardancy of polymer composites is dependent on the controllable distribution of functional fillers. Herein, a facile method to control distribution of multi-walled carbon nanotubes (MWCNTs) and flame retardants in poly (butylene succinate)/thermoplastic polyurethane blends by constructing segregated structure was reported. High-efficiently conductive networks could be easily constructed in segregated structure, resulting in a low percolation threshold of 0.22 wt%. High EMI shielding effectiveness of ~45 dB could be achieved in segregated samples with 2.5 wt% MWCNTs which far exceeds commercial requirement. Furthermore, the segregated samples also exhibited excellent flame retardancy and the UL-94 rating reached V-0 with prompt self-extinguishment and disappeared melt-dripping. More importantly, this unique network could provide synergistic enhancement for the flame retardancy which increases with the increasing of MWCNTs loading. Accordingly, this work provided a promising route to fabricate various high-performance EMI shielding polymer composites with excellent flame retardancy.

聚合物复合材料的电磁干扰（EMI）屏蔽和阻燃性的同时提高取决于功能性填料的可控分布。在本文中，已经报道了通过构建隔离结构来控制聚（丁二酸丁二酸酯）/热塑性聚氨酯共混物中多壁碳纳米管（MWCNT）和阻燃剂分布的简便方法。高效的导电网络很容易以隔离结构构建，从而导致0.22 wt％的低渗透阈值。在含有2.5 wt％MWCNT的隔离样品中，可以达到〜45 dB的高EMI屏蔽效果，远远超过了商业要求。此外，分离的样品还显示出优异的阻燃性，UL-94等级达到V-0，并迅速自熄并消失了熔滴。更重要的是，这种独特的网络可以为阻燃性提供协同增强作用，随着MWCNTs负荷的增加，阻燃性也随之增强。因此，这项工作为制造具有优异阻燃性的各种高性能EMI屏蔽聚合物复合材料提供了一条有希望的途径。