Abstract Here, a facile approach to constructing efficiently segregated conductive networks in the poly(lactic acid)/silver (PLA/Ag) nanocomposites were developed by coating Ag particles on PLA microfibers and then compression molding. The electrical conductivity and electromagnetic interference shielding effectiveness (EMI SE) of the nanocomposites were obviously enhanced by these efficiently conductive networks because of the well Ag coating layers on PLA microfibers. Furthermore, the electrical conductivity and the EMI SE of the nanocomposites increased with increasing the coating amount of Ag particles, which can be easily tuned by controlling the coating time. It was found that the chain-structured PLA/Ag nanocomposites with coating time of 7 min with 5.89 vol% Ag particles possessed the remarkable electrical conductivity of 254 S/m and outstanding EMI SE of 50 dB at 8.2–12.4 Hz when the testing samples with the thickness of 1.5 mm, which far surpassed the targeted value of 20 dB for commercial applications. The excellent EMI shielding properties of the nanocomposites were ascribed to the unique segregated chain-structures, which provide enormous interfaces to reflect, scatter and adsorb the electromagnetic waves many times. The PLA/Ag nanocomposites with segregated networks were also found to be an absorption dominated EMI shielding mechanism.

中文翻译：

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通过在微纤维上镀银以屏蔽电磁干扰，在聚乳酸/银纳米复合材料中构建有效隔离的导电网络的简便方法

摘要在这里，通过在 PLA 微纤维上涂覆 Ag 颗粒，然后压缩成型，开发了一种在聚乳酸/银 (PLA/Ag) 纳米复合材料中构建有效隔离导电网络的简便方法。由于 PLA 微纤维上有良好的 Ag 涂层，这些高效导电网络明显增强了纳米复合材料的导电性和电磁干扰屏蔽效率 (EMI SE)。此外，纳米复合材料的电导率和 EMI SE 随着 Ag 颗粒涂覆量的增加而增加，这可以通过控制涂覆时间轻松调节。结果表明，链状结构的 PLA/Ag 纳米复合材料的涂覆时间为 7 分钟，5 分钟。89 vol% Ag 颗粒在厚度为 1.5 mm 的测试样品时具有 254 S/m 的显着电导率和 50 dB 在 8.2-12.4 Hz 下的出色 EMI SE，远远超过商业应用的目标值 20 dB . 纳米复合材料优异的 EMI 屏蔽性能归因于独特的分离链结构，它提供了巨大的界面来多次反射、散射和吸收电磁波。还发现具有隔离网络的 PLA/Ag 纳米复合材料是一种以吸收为主的 EMI 屏蔽机制。纳米复合材料优异的 EMI 屏蔽性能归因于独特的分离链结构，它提供了巨大的界面来多次反射、散射和吸收电磁波。还发现具有隔离网络的 PLA/Ag 纳米复合材料是一种以吸收为主的 EMI 屏蔽机制。纳米复合材料优异的 EMI 屏蔽性能归因于独特的分离链结构，它提供了巨大的界面来多次反射、散射和吸收电磁波。还发现具有隔离网络的 PLA/Ag 纳米复合材料是一种以吸收为主的 EMI 屏蔽机制。