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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Electromagnetic Field Absorbing Polypropylene Nanocomposites with Tuned Permittivity and Permeability by Nanoiron and Carbon Nanotubes
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Electromagnetic Field Absorbing Polypropylene Nanocomposites with Tuned Permittivity and Permeability by Nanoiron and Carbon Nanotubes

机译：纳米铁和碳纳米管的介电常数和磁导率可调的电磁吸收聚丙烯纳米复合材料

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摘要

Highly efficient electromagnetic field absorption at gigahertz (GHz) was reported in the novel magnetic polymer nanocomposites (MPNCs) with in-situ synthesized Fe@Fe2O3 core@shell nanoparticles (NPs) or their decorated multiwall carbon nanotubes (MWNTs) dispersed in the polypropylene (PP) matrix through a one-pot bottom-up method. PP grafted maleic anhydride (PP-g-MA) with different molecular weights served as surfactant to stabilize the in-situ-formed NPs and simultaneously as compatibilizer to enhance the bonding at the PP—filler interfaces. Because of the strong magnetization of the PP MPNCs filled with 20.0 wt % Fe@Fe2O3 NPs stabilized by PP-g-MA (M_n = 800), a minimum reflection loss (RL) of —31.5 dB was observed at 18,0 GHz, and the frequency bandwidth with RL lower than —10.0 dB was 3.1 GHz (from 16.9 to 20.0 GHz) in the MPNC sample with a thickness of 5.5 mm. However, due to the lack of magnetic loss, only a weak RL of 4.3 dB was found at frequency of 16.8 GHz for the PP/PP-g-MA (M_n = 800)/1.0 wt % MWNTs nanocomposites sample with a thickness of 5.5 mm. When the PP MPNCs filled with Fe@Fe2O3 NPs decorated MWNTs (sample thickness of 5.0 mm) in the presence of low molecular weight PP-g-MA (M_n - 800), the RL of —24.5 dB at 20.0 GHz was observed. Through simply changing M_n of PP-g-MA from 800 to 8000, more oxidized iron resulted in a decreased permeability and smaller RL in the high frequency range. The in-situ-formed nanofillers significantly reduced the flammability of PP for potential wide applications.
机译：在新型磁性聚合物纳米复合材料（MPNC）中报告了千兆赫（GHz）的高效电磁场吸收，该复合材料原位合成Fe @ Fe2O3核@壳纳米粒子（NP）或修饰的装饰性多壁碳纳米管（MWNT）分散在聚丙烯中（ PP）矩阵通过一锅法自底向上进行。具有不同分子量的PP接枝的马来酸酐（PP-g-MA）用作表面活性剂，以稳定原位形成的NP，同时还用作增容剂，以增强PP-填料界面的键合。由于填充有通过PP-g-MA（M_n = 800）稳定了20.0 wt％Fe @ Fe2O3 NP的PP MPNC的强磁化强度，在18,0 GHz处观察到的最小反射损耗（RL）为-31.5 dB，在厚度为5.5 mm的MPNC样品中，RL低于—10.0 dB的频率带宽为3.1 GHz（从16.9至20.0 GHz）。但是，由于缺少磁损耗，对于厚度为5.5的PP / PP-g-MA（M_n = 800）/1.0 wt％MWNTs纳米复合材料样品，在16.8 GHz的频率下仅发现4.3 dB的弱RL毫米当在低分子量PP-g-MA（M_n-800）存在的情况下，用Fe @ Fe2O3 NP填充的PP MPNC装饰MWNT（样品厚度为5.0 mm）时，在20.0 GHz处观察到RL为–24.5 dB。通过简单地将PP-g-MA的M_n从800更改为8000，更多的氧化铁导致了高频范围内磁导率的降低和RL的减小。原位形成的纳米填料显着降低了PP的可燃性，可用于潜在的广泛应用。

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