Zhan Yanhu, Lago Emanuele, Santillo Chiara, Del Río Castillo Antonio Esaú, Hao Shuai, Buonocore Giovanna G, Chen Zhenming, Xia Hesheng, Lavorgna Marino, Bonaccorso Francesco
School of Materials Science and Engineering, Liaocheng University, Liaocheng 252000, China.
Graphene Labs, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genoa, Italy and Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova, via Dodecaneso 31, 16146 Genoa, Italy.
Nanoscale. 2020 Apr 14;12(14):7782-7791. doi: 10.1039/c9nr10672c. Epub 2020 Mar 26.
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 at 10.3 GHz and a thermal conductivity equal to 0.25 W m K. 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.
具有各向异性特性的多功能聚合物复合材料正引起人们的兴趣，因为它们满足了对多任务材料不断增长的需求。在这项工作中，通过将层层（LBL）过滤方法与碳纳米管（CNT）和六方氮化硼薄片（hBN）在天然橡胶胶乳颗粒（NR）上的交替组装相结合，制备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热导率和电导率，可通过层配方进行调整。最佳复合材料由四层用8份（每百份橡胶）CNT（约7.4重量%）改性的NR和四层交替的含12份hBN（约10.7重量%）的层组成。该复合材料在10.3 GHz时表现出22.41±0.14 dB·mm的电磁干扰（EMI）屏蔽效能，热导率等于0.25 W·m⁻¹·K。此外，当层状复合材料用作电热加热器时，在2.5 V的输入偏压下，表面在约2分钟内达到约103°C的稳定温度。
