Bashar Azerang, Taher Azdast, Ali Doniavi, Rezgar Hasanzadeh
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引用次数: 0
Abstract
The advancement of polymeric nanocomposite foams for electromagnetic interference (EMI) shielding can be credited to two main factors: the multiple deflections of the incoming electromagnetic waves within the shield and the formation of conductive pathways by the nanofillers. In this research, chemical foaming is employed in injection molding machine to create foams made of acrylonitrile butadiene styrene (ABS) and multi-walled carbon nanotubes (MWCNTs). By incorporating a 1 wt% concentration of MWCNT, applying a pressure time of 2 s, and allowing for a cooling time of 60 s, foamed nanocomposite samples demonstrated a remarkable total EMI shielding effectiveness (SE) of SET = 16.25 dB. This SE value surpassed the EMI SE values of the remaining samples across the X-band frequency range. Upon comparing foamed samples of pure and nanocomposite materials with identical cell density, it was observed that the enhancement of SET for the nanocomposite foamed sample reached 21.2% in contrast to the pure foamed sample operating at 11.52 GHz. The research revealed that incorporating a microcellular structure had a notable impact on the electrical conductivity, relative permittivity, dielectric loss, relative permeability, and magnetic loss in ABS/MWCNT nanocomposites. Furthermore, the nanocomposite foams demonstrated significantly greater EMI SE in comparison to their solid counterparts.
用于电磁干扰(EMI)屏蔽的聚合物纳米复合泡沫的进步主要归功于两个因素:传入电磁波在屏蔽内的多重偏转和纳米填料形成的导电通道。在这项研究中,化学发泡被应用于注塑成型机,以制造由丙烯腈-丁二烯-苯乙烯(ABS)和多壁碳纳米管(MWCNTs)制成的泡沫。通过加入浓度为 1 wt%的多壁碳纳米管,加压时间为 2 秒,冷却时间为 60 秒,发泡纳米复合材料样品显示出显著的总 EMI 屏蔽效果(SE),即 SET = 16.25 dB。在 X 波段频率范围内,该 SE 值超过了其余样品的 EMI SE 值。在比较具有相同单元密度的纯泡沫材料和纳米复合材料泡沫样品时发现,与工作频率为 11.52 GHz 的纯泡沫样品相比,纳米复合材料泡沫样品的 SET 增强了 21.2%。研究表明,微孔结构对 ABS/MWCNT 纳米复合材料的电导率、相对介电率、介电损耗、相对磁导率和磁损耗有显著影响。此外,与固体泡沫相比,纳米复合泡沫的电磁干扰 SE 明显更大。
期刊介绍:
The Journal of Thermoplastic Composite Materials is a fully peer-reviewed international journal that publishes original research and review articles on polymers, nanocomposites, and particulate-, discontinuous-, and continuous-fiber-reinforced materials in the areas of processing, materials science, mechanics, durability, design, non destructive evaluation and manufacturing science. This journal is a member of the Committee on Publication Ethics (COPE).