Segregated structure was one of the effective approaches to improve electromagnetic interference (EMI) shielding performance of conductive polymer composites. Herein, highly conductive interfaces were constructed by coating silver nanoparticles on the surface of poly (lactic acid) (PLLA) particles in the conventional segregated (CS) PLLA/poly(ε-caprolactone)/multi-walled carbon nanotubes (PLLA/PCLNT) composites to form the interface-metallized segregated (IMS) composites. Expectedly, the EMI SE of IMS composites were superior to that of the CS composites with the same MWCNTs loadings. Specifically, the IMS composites with only 0.44 vol% silver achieved an excellent EMI SE of 43.3 dB which was 35% higher than the CS composites (32.1 dB). Furthermore, the EMI SE value of the IMS composites decreased drastically after destroying the segregated structure. Therefore, the EMI SE of the IMS composites was related to both segregated structure and highly conductive interfaces, which could enhance multiple scattering, interfacial polarization and electron hopping at the interfaces.

隔离结构是提高导电聚合物复合材料电磁干扰（EMI）屏蔽性能的有效方法之一。在此，通过在传统的隔离（CS）PLLA /聚（ε-己内酯）/多壁碳纳米管（PLLA / PCLNT）中的聚乳酸（PLLA）颗粒表面上涂覆银纳米颗粒来构建高导电界面形成界面金属化隔离（IMS）复合材料。可以预期，在相同的MWCNTs负载下，IMS复合材料的EMI SE优于CS复合材料的EMI SE。具体而言，仅含0.44％（体积）银的IMS复合材料具有43.3 dB的出色EMI SE，比CS复合材料（32.1 dB）高35％。此外，破坏隔离结构后，IMS复合材料的EMI SE值急剧下降。因此，IMS复合材料的EMI SE与隔离结构和高导电界面有关，这可以增强界面处的多重散射，界面极化和电子跳跃。