The orientation and inhomogeneous distribution of carbon nanofibers and distinctive internal structure in polymer composites induced by 3D-printing enabling electromagnetic shielding regulation

作者：Wu, Tianyu; Huan, Xianhua; Zhang, Hongmingjian; Wu, Lingyun; Sui, Gang^*; Yang, Xiaoping

来源：Journal of Colloid and Interface Science, 2023, 638: 392-402.

DOI：10.1016/j.jcis.2023.02.014

• 3D printing
• Conductive polymer composite
• Electromagnetic interference shielding
• Carbon nanofiber
• Polycaprolactone

Carbon nanofiber (CNF)/polycaprolactone (PCL) composites were three-dimention (3D) printed into elec-tromagnetic interference (EMI) shielding parts. 3D-printing process led to an inhomogeneous CNFs dis-tribution in printed composites. The special high-resistance "internal surfaces" introduced between printed threads reduced the conductivity of printed parts and resulted in characteristic secondary perco-lation phenomena. Meanwhile, the accelerated melt flow in nozzle oriented CNFs in composites along the printing direction, increasing the percolation threshold compared to the random arrangement. As two stage of percolation networks formed, the 3D-printed CNF/PCL parts exhibited excellent EMI shielding performance, with EMI shielding effectiveness value up to 58.7 dB. By controlling the packing density of the printed part, a large number of apertures and heterogeneous interfaces were easily introduced into the interior of parts. It promoted multiple reflection and absorption of electromagnetic waves inside the parts, and enabled adjustment of weight and shielding effectiveness. Therefore, the 3D printing enabled the flexible formation of complex porous structures. From basic materials to designed components, the 3D printing technology can facilitate the transformation of shielding materials into high performance components that are finely designed both internally and externally, making it a promising technology in the field of manufacturing lightweight, high performance EMI shielding materials.

• 单位
  北京化工大学