Multifunctional polymer composites with anisotropic properties are attracting interest as they fulfil the growing demand of multitasking materials. In this work, anisotropic polymer composites have been fabricated by combining the layer-by-layer (LBL) filtration method with the alternative assembling of carbon nanotubes (CNTs) and hexagonal boron nitride flakes (hBN) on natural rubber latex particles (NR). The layered composites exhibit anisotropic thermal and electrical conductivities, which are tailored through the layer formulations. The best composite consists of four layers of NR modified with 8 phr (parts per Hundred Rubber) CNTs (∼7.4 wt%) and four alternate layers with 12 phr hBN (∼10.7 wt%). The composites exhibit an electromagnetic interference (EMI) shielding effectiveness of 22.41 ± 0.14 dB mm⁻¹ at 10.3 GHz and a thermal conductivity equal to 0.25 W m⁻¹ K⁻¹. Furthermore, when the layered composite is used as an electrical thermal heater the surface reaches a stable temperature of ∼103 °C in approx. 2 min, with an input bias of 2.5 V.

中文翻译：

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各向异性层状碳纳米管/氮化硼/橡胶复合材料及其在电磁屏蔽中的应用

具有各向异性特性的多功能聚合物复合材料满足了多任务材料不断增长的需求，因此引起了人们的关注。在这项工作中，通过将逐层（LBL）过滤方法与碳纳米管（CNT）和六方氮化硼薄片（h BN）在天然橡胶胶乳颗粒（NR）上的替代组装相结合，制造了各向异性聚合物复合材料。层状复合材料表现出各向异性的导热性和导电性，可以通过层配方进行调整。最好的复合材料包括四层由8 phr（每百份橡胶的份数）CNT改性的NR（约7.4 wt％）和四层12 phr h的交替层BN（〜10.7 wt％）。该复合材料在10.3 GHz时具有22.41±0.14 dB mm ^-1的电磁干扰（EMI）屏蔽效果，导热率等于0.25 W m ^-1 K ^-1。此外，当该层状复合材料用作电热加热器时，其表面在约200°C的温度下达到约103°C的稳定温度。2分钟，输入偏置为2.5V。