Abstract Fabricating electromagnetic interference (EMI) shielding materials with excellent flame retarding properties is significant to attenuate undesirable electromagnetic waves caused by electronic devices and simultaneously improve the flame safety of the electronic components. Herein, a novel EMI shielding composite with multilayered structure was fabricated at a low particle loading via layer-multiplying coextrusion technology. Especially, within the multilayered composites, poly (butylene succinate) (PBS) filled with carbon nanotubes (CNTs) was used to construct conducting layer while thermoplastic polyurethane (TPU) filled with intumescent flame retardants (IFRs) and CNTs was used to construct synergistic flame-retarding layer. The content of CNTs and IFRs in the whole system were below 4 wt% and 20 wt%, respectively. Morphological observation demonstrated the alternating multilayered structure and the selective distribution of IFRs and CNTs. Besides, by tailoring the layer numbers, the composites showed tunable EMI shielding and flame retarding performances. With regard to EMI shielding performance, the absorption-dominated average EMI shielding effectiveness (SE) values of both 8- and 16-layer specimens exceeded 30 dB in the range of 8.2–12.4 GHz. Furthermore, superior flame retardancy with prompt self-extinguishment and anti-dripping was achieved in these specimens owning to the production of continuous and foaming carbonaceous structure among layers. Especially the 8-layer specimen, the UL-94 rating was categorized in V-0. Consequently, this work provided a promising and facile route to fabricate polymeric composites simultaneously possessing excellent EMI shielding and flame-retarding properties to fulfill the stringent requirements in practical application.

中文翻译：

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在聚丁二酸丁二醇酯和热塑性聚氨酯多层复合材料中构建电磁干扰屏蔽和阻燃协同网络的策略

摘要 制备具有优异阻燃性能的电磁干扰（EMI）屏蔽材料对于衰减电子设备产生的不良电磁波，同时提高电子元件的阻燃安全性具有重要意义。在此，通过层积共挤技术在低颗粒负载下制造了一种具有多层结构的新型 EMI 屏蔽复合材料。特别是在多层复合材料中，填充有碳纳米管（CNT）的聚丁二酸丁二醇酯（PBS）用于构建导电层，而填充有膨胀型阻燃剂（IFR）和碳纳米管的热塑性聚氨酯（TPU）用于构建协同阻燃- 延迟层。整个体系中CNTs和IFRs的含量分别低于4wt%和20wt%。形态观察证明了 IFR 和 CNT 的交替多层结构和选择性分布。此外，通过调整层数，复合材料显示出可调的 EMI 屏蔽和阻燃性能。关于 EMI 屏蔽性能，8 层和 16 层样品的吸收主导的平均 EMI 屏蔽效率 (SE) 值在 8.2-12.4 GHz 范围内均超过 30 dB。此外，由于层间连续和发泡碳质结构的产生，在这些样品中实现了具有迅速自熄性和抗滴落性的优异阻燃性。特别是 8 层试样，UL-94 等级被归类为 V-0。最后，