Microcellular foamed polyamide 6/carbon nanotube composites withsuperior electromagnetic wave absorption

作     者：Menglong Xu Linfeng Wei Li Ma Jiawei Lu Tao Liu Ling Zhang Ling Zhao Chul B.Park Menglong Xu;Linfeng Wei;Li Ma;Jiawei Lu;Tao Liu;Ling Zhang;Ling Zhao;Chul B.Park

作者机构：State Key Laboratory of Chemical EngineeringSchool of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China Department of Mechanical and Industrial EngineeringUniversity of Toronto5 King’s College RoadTorontoOntario M5S 3G8Canada Shanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第117卷第22期

页      面：215-224页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：This work was funded by the National Key Research and Development Program of China(No.2016YFB0302200) the Key Research and Development Plan of Anhui Province(No.202104g01020003) the Fundamental Research Funds for the Central Universities(No.JKA012011002) the“111 Project”(No.B20031) Also,this research was supported by the China Scholarship Council(No.201906740084)during the work at the University of Toronto.Additional support was provided by Feringa Nobel Prize Scientist Joint Research Center.We would also like to gratefully thank Dr.Biao Zhao for assistance with electromagnetic data analysis in this research.Supplem 

主　　题：Polymer nanocomposites Supercritical CO_(2)foaming Void fraction Dielectric properties Electromagnetic wave absorption 

摘      要：Electromagnetic (EM) wave pollution causing damage to precision equipment and threatening thehealth of living organisms has attracted considerable attention. Herein, promising microcellular foamedpolyamide 6 (PA6)/carbon nanotube (CNT) composites for highly efficient EM wave absorption were successfully fabricated using supercritical CO_(2) foaming. Nanocomposites foams with a void fraction rangingfrom 38.7% to 85.1% were achieved, providing a platform to assess the correlation of the electrical conductivity, the dielectric permittivity and the EM wave absorption properties with porosity. Notably, theFoam-257.5C sample with a void fraction of 38.7% exhibited outstanding EM wave absorption characteristics at a thickness of only 1.59 mm and an ultra-low reflection loss value of -55.3 dB (99.9997% wave absorption). Most importantly, the effective absorption bandwidth (EAB) of the Foam-257.5C sample couldcover the entire Ku band (12.4–18 GHz) by slightly adjusting the thickness from 1.20 to 1.60 mm. Thesuperior EM wave absorption performance of the Foam-257.5C sample was attributed to multiple reflections and scattering at the solid-gas interfaces, favorable impedance matching due to the existence ofa large polymer-air interface area, conductive loss near the interfaces and interfacial polarization. Thus,this study offers an eco-friendly, simple and versatile methodology to develop high-efficiency, flexiblepolymer-based EM wave absorbents.