文献类型：期刊文献

英文题名：Microcellular foamed polyamide 6/carbon nanotube composites with wave

作者：Xu, Menglong[1,2,3];Wei, Linfeng[2];Ma, Li[2];Lu, Jiawei[1];Liu, Tao[1];Zhang, Ling[3];Zhao, Ling[1];Park, Chul B.[2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Univ Toronto, Dept Mech & Ind Engn, 5 Kings Coll Rd, Toronto, ON M5S 3G8, Canada;[3]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：117

起止页码：215

外文期刊名：JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000788129800006)】；

基金：This work was funded by the National Key Research and Devel-opment Program of China (No. 2016YFB0302200) , the Key Research and Development Plan of Anhui Province (No. 202104g01020 0 03) , the Fundamental Research Funds for the Central Universities (No. JKA012011002) and 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. Addi-tional 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 re-search.

语种：英文

外文关键词：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 the health of living organisms has attracted considerable attention. Herein, promising microcellular foamed polyamide 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 ranging from 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, the Foam-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 could cover the entire Ku band (12.4-18 GHz) by slightly adjusting the thickness from 1.20 to 1.60 mm. The superior 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 of a 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, flexible polymer-based EM wave absorbents.