High-Performance Epoxy Nanocomposites Reinforced with Three-Dimensional Carbon Nanotube Sponge for Electromagnetic Interference Shielding
High-Performance Epoxy Nanocomposites Reinforced with Three-Dimensional Carbon Nanotube Sponge for Electromagnetic Interference Shielding
复制标题
三维碳纳米管海绵增强的高性能环氧纳米复合材料用于电磁干扰屏蔽。
DOI：
10.1002/adfm.201503782
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发表时间：
2016-01-20
影响因子：
19
通讯作者：
Yu, Zhong-Zhen
中科院分区：
文献类型：
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作者：
Chen, Yu;Zhang, Hao-Bin;Yu, Zhong-Zhen
以三维碳纳米管(CNT)海绵为三维增强导电骨架，采用浸渍法制备了轻质高性能电磁干扰(EMI)屏蔽环氧纳米复合材料。预制的、高度多孔的和导电的骨架充当了电子传输的高速公路，可以抵抗高外部负载以保护环氧纳米复合材料。结果表明，当碳纳米管海绵含量为0.66wt%时，其X波段的电导率为148wt m(-1)，电磁屏蔽效能约为33d B，高于常规碳纳米管含量为20wt%的环氧纳米复合材料。更重要的是，与传统的碳纳米管相比，碳纳米管海绵在增强和增韧环氧复合材料方面具有双重优势。只有0.66wt%的碳纳米管海绵与纯净的环氧树脂相比，弯曲强度和拉伸强度分别提高了102%和%。此外，纳米复合材料的拉伸韧性提高了250%，断裂伸长率提高了97%。这些结果表明，碳纳米管海绵是一种理想的机械强度和高性能电磁屏蔽纳米复合材料的功能部件。
Light-weight and high-performance electromagnetic interference (EMI)shielding epoxy nanocomposites are prepared by an infiltration method using a 3D carbon nanotube (CNT) sponge as the 3D reinforcement and conducting framework. The preformed, highly porous, and electrically conducting framework acts as a highway for electron transport and can resist a high external loading to protect the epoxy nanocomposite. Consequently, a remarkable conductivity of 148 S m(-1) and an outstanding EMI shielding effectiveness of around 33 dB in the X-band are achieved for the epoxy nanocomposite with 0.66 wt% of CNT sponge, which is higher than that achieved for epoxy nanocomposites with 20 wt% of conventional CNTs. More importantly, the CNT sponge provides a dual advantage over conventional CNTs in its prominent reinforcement and toughening of the epoxy composite. Only 0.66 wt% of CNT sponge significantly increases the flexural and tensile strengths by 102% and 64%, respectively, as compared to those of neat epoxy. Moreover, the nanocomposite shows a 250% increase in tensile toughness and a 97% increase in elongation at break. These results indicate that CNT sponge is an ideal functional component for mechanically strong and high-performance EMI-shielding nanocomposites.