Chen Jing, Zhang Yang, Li Haorong, Feng Wenkai, Gao Xiping, Yao Dahu, Wu Hong, Wang Hui, You Tianyan, Lu Chang, Pang Xinchang
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China.
The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China.
ACS Appl Mater Interfaces. 2024 May 15;16(19):25148-25159. doi: 10.1021/acsami.4c04426. Epub 2024 May 2.
Green electromagnetic interference (EMI) shielding materials not only require high shielding effectiveness (SE) and low reflection but also need to be recyclable after damage; however, it is challenging to strike a balance in practice. Here, a polyacrylamide (PAM) composite composed of numerous chemically cross-linked PAM@carbon nanotube (cPAM@CNT) core-shell particles featuring rich wrinkled microstructures was prepared using an adsorption-drying-shrinking strategy. The wrinkled microstructures enable the incident electromagnetic waves (EMWs) to undergo attenuation within the composites, achieving an average EMI SE of 67.5 dB in the X band. Due to the hygroscopicity of hydrophobically associated PAM (hPAM, an adhesive for cPAM@CNTs core-shell particles), the average EMI SE of the composites further increased to 83.2 dB after exposure to 91% relative humidity for 24 h, with only a 2.7 dB low reflection. Additionally, the composites also demonstrated excellent Joule heating, photothermal performance, and recyclability, which exhibit substantial promise for advanced EMI shielding applications.
绿色电磁干扰（EMI）屏蔽材料不仅需要高屏蔽效能（SE）和低反射率，而且在损坏后还需要可回收利用；然而，在实际中要达到平衡具有挑战性。在此，采用吸附-干燥-收缩策略制备了一种由大量具有丰富褶皱微观结构的化学交联聚丙烯酰胺（PAM）@碳纳米管（cPAM@CNT）核壳颗粒组成的聚丙烯酰胺（PAM）复合材料。这些褶皱微观结构使入射电磁波（EMW）在复合材料内部发生衰减，在X波段实现了67.5 dB的平均EMI SE。由于疏水缔合聚丙烯酰胺（hPAM，cPAM@CNT核壳颗粒的粘合剂）的吸湿性，复合材料在91%相对湿度下暴露24小时后，平均EMI SE进一步提高到83.2 dB，反射率仅为2.7 dB。此外，该复合材料还表现出优异的焦耳热、光热性能和可回收性，在先进的EMI屏蔽应用中具有巨大潜力。
