Injection molding of segregated carbon nanotube/polypropylene composite with enhanced electromagnetic interference shielding and mechanical performance
Injection molding of segregated carbon nanotube/polypropylene composite with enhanced electromagnetic interference shielding and mechanical performance
复制标题
具有增强电磁干扰屏蔽和机械性能的偏析碳纳米管/聚丙烯复合材料的注塑成型
DOI：
10.1016/j.compscitech.2020.108253
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发表时间：
2020
影响因子：
9.1
通讯作者：
Zhong-Ming Li
中科院分区：
文献类型：
--
作者：
Yun-Peng Zhang;Chang-Ge Zhou;Wen-Jin Sun;Ting Wang;Li-Chuan Jia;Ding-Xiang Yan;Zhong-Ming Li
导电高分子复合材料中偏析结构的形成在提高电磁干扰（EMI）屏蔽性能方面显示出巨大的优势。然而，这种偏析复合材料的加工方法受到限制，力学性能严重恶化，阻碍了其实际应用。在此，我们展示了同时改善EMI屏蔽和机械性能的隔离碳纳米管/聚丙烯（CNT/PP）复合材料，通过简单和环保的方法组成的预涂，熔融混合，注塑成型。仅含有3.5重量% CNT的隔离CNT/PP复合材料表现出32 dB的平均EMI屏蔽效能（EMI SE），与通过常规注射成型制备的CNT/PP复合材料的14 dB和通过压缩成型制备的CNT/PP复合材料的25 dB相比，其显示出130%和30%的改善。我们的隔离CNT/PP复合材料也达到了78%的高断裂伸长率（EB），比常规注塑成型的16%和压缩成型的4%高出约4和17倍，具有相当的拉伸强度和杨氏模量。该研究为规模化制备具有良好电磁屏蔽性能和力学性能的隔离复合材料提供了一种可行的方法。
The formation of segregated structure in conductive polymer composites reveals great superiority in gaining improved electromagnetic interference (EMI) shielding performance. Nevertheless, the restricted processing method and seriously deteriorated mechanical properties hamper the practical applications of such segregated composites. Herein, we demonstrate simultaneously improved EMI shielding and mechanical performance in a segregated carbon nanotube/polypropylene (CNT/PP) composite,viaa facile and eco-friendly method composed by pre-coating, melt mixing, and injection molding. The segregated CNT/PP composite containing only 3.5 wt% CNT exhibits an average EMI shielding effectiveness (EMI SE) of 32 dB, which shows 130% and 30% improvements in comparison to 14 dB for the CNT/PP composite prepared by conventionally injection molding and 25 dB for the CNT/PP composite prepared by compression molding. Our segregated CNT/PP composite also attains a high elongation at break (EB) of 78%, about 4 and 17 times higher than 16% for the conventionally injection molded one and 4% for the compression molded one, with comparable tensile strength and Young's modulus. This work provides a feasible approach to guide the scaled preparation of segregated composites with satisfactory EMI shielding and mechanical performance.