Constructing segregated structure in conductive polymer composite (CPC) is effective to achieve high electromagnetic interference shielding effectiveness (EMI SE) at low filler loading. Nevertheless, the present segregated CPCs were only fabricated via the compression molding technique, which limits their practical application. In this work, the injection molding technique was utilized for the first time to develop a carbon nanotube (CNT)/isotactic polypropylene (iPP)/atactic polypropylene (aPP) composite with typical segregated structure. The injection molded segregated CNT/PP composite exhibits an excellent EMI SE of 43.1 dB, which is 67% higher than the CNT/PP composite with randomly distributed CNTs, at the same CNT loading of 5.0 wt %. Such EMI SE is also comparable to the value for segregated CNT/PP composites prepared by compression molding. Our work provides a promising strategy to develop segregated CPCs via an efficient injection molding technique, in comparison to the compression molding technique.

中文翻译：

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注塑成型隔离碳纳米管/聚丙烯复合材料，可有效屏蔽电磁干扰

在低填充量的情况下，在导电聚合物复合材料（CPC）中构造隔离结构可有效实现高电磁干扰屏蔽效果（EMI SE）。然而，目前的隔离式CPC只能通过压缩成型技术来制造，这限制了它们的实际应用。在这项工作中，首次采用注射成型技术来开发具有典型隔离结构的碳纳米管（CNT）/全同立构聚丙烯（iPP）/全同立构聚丙烯（aPP）复合材料。注射成型的分离的CNT / PP复合材料表现出43.1 dB的出色EMI SE，在相同的CNT含量为5.0 wt％的情况下，它比具有随机分布的CNT的CNT / PP复合材料高67％。这样的EMI SE也可与通过压缩成型制备的分离的CNT / PP复合材料的值相媲美。