Lightweight, multifunctional microcellular PMMA/Fe3O4@MWCNTs nanocomposite foams with efficient electromagnetic interference shielding. (September 2017)

• Record Type: Journal Article
• Authors: Zhang, Hongming; Zhang, Guangcheng; Li, Jiantong; Fan, Xun; Jing, Zhanxin; Li, Jianwei; Shi, Xuetao
• Is Part Of: Composites. Volume 100(2017)
• Page Start: 128
• Page End: 138
• Publication Date: 2017-09
• Subjects: A. Polymer-matrix composites (PMCs) -- B. Electrical properties -- B. Microstructure -- E. Foaming; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2017.05.009
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: Lightweight and multifunctional PMMA/Fe3 O4 @MWCNTs composite foams with density of 0.22–0.38 g/cm 3 were fabricated by supercritical carbon dioxide (ScCO2 ) foaming process. Benefitting from the existence of microcellular structure and the Fe3 O4 @MWCNTs hybrids, the specific Electromagnetic interference shielding effectiveness (EMI SE) of obtained PMMA/Fe3 O4 @MWCNTs foams was significantly enhanced. The resulting foams with hybrids loading of 7 wt% displayed excellent specific EMI SE of 50 dB/(g/cm 3 ) over the X-band. Furthermore, the EMI shielding mechanisms of the porous materials were discussed and it suggested that the dominant contribution to EMI SE was absorption. Meanwhile, the high-strength composite foams also exhibited superparamagnetic behavior and low thermal conductivity of 0.080–0.142 W/(m k). In this work, we provide a feasible way to produce lightweight and multifunctional PMMA/Fe3 O4 @MWCNTs foams with superior EMI shielding performance to apply in the electronics and aerospace industries.