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首页> 外文期刊>RSC Advances >Electromagnetic wave absorption polyimide fabric prepared by coating with core–shell NiFe2O4@PANI nanoparticles
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Electromagnetic wave absorption polyimide fabric prepared by coating with core–shell NiFe2O4@PANI nanoparticles

机译：核壳型NiFe 2 O 4 @PANI纳米粒子包覆制备的电磁波吸收聚酰亚胺织物

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The nickel ferrite@polyaniline/polyimide (NiFe2O4@PANI/PI) fabric was prepared by coating the PI fabric with core–shell NiFe2O4@PANI nanoparticles to obtain an excellent microwave absorption performance. Firstly, a microwave absorbing agent was fabricated by dispersing the pre-synthesized core–shell NiFe2O4@PANI nanoparticles into epoxy monomer, in which the covalent bonding between epoxy groups and amine groups from PANI made them uniformly disperse. Then the agent was coated on to the PI fabric to a thickness of 0.12 mm. The results of field effect-transmission electron microscopy and scanning electron microscopy demonstrated the core–shell structure of NiFe2O4@PANI and the composite structure of the NiFe2O4@PANI/PI fabric. The resultant fabric possessed a high microwave attenuation property with a minimum reflection loss value of ?19.2 dB (>90% attenuation) at 16.1 GHz and the effective absorption bandwidth was 5.1 GHz. This high performance was attributed to the uniform dispersion of core–shell NiFe2O4@PANI nanoparticles, better impedance matching and intensive synergistic effect between dielectric loss caused by the PANI shell and magnetic loss from the NiFe2O4 core. The favorable flexibility, processability and high tensile properties gave the composite fabric a long service time under pressure or foldable conditions. Furthermore, this process was environmentally friendly as no organic solvent was used in the whole process and the NiFe2O4@PANI/PI fabric could potentially be applied in microwave absorbing fields.
机译：通过涂覆制备镍铁氧体@聚苯胺/聚酰亚胺（NiFe 2 O 4 @ PANI / PI）织物具有NiFe 2 O 4 @PANI纳米核壳的PI织物具有优异的微波吸收性能。首先，通过分散预合成的核-壳型NiFe 2 O 4 @制备微波吸收剂将PANI纳米颗粒转变成环氧单体，其中PANI的环氧基和胺基之间的共价键使它们均匀分散。然后将所述试剂涂覆到PI织物上至0.12mm的厚度。场效应-透射电子显微镜和扫描电子显微镜的结果表明，NiFe 2 O 4 的核壳结构small> @PANI和NiFe 2 O 4 @ PANI / PI织物的复合结构。所得织物具有高的微波衰减性能，在16.1GHz处的最小反射损耗值为〜19.2dB（衰减＞ 90％），有效吸收带宽为5.1GHz。高性能归因于核-壳NiFe 2 O 4 @PANI纳米颗粒的均匀分散，更好PANI壳引起的介电损耗与NiFe 2 O 4 核心。良好的柔韧性，可加工性和高拉伸性能使复合织物在压力或可折叠条件下具有较长的使用寿命。此外，此过程对环境无害，因为整个过程均不使用有机溶剂，而且NiFe 2 O 4 @ PANI / PI织物可能会应用于微波吸收领域。

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