Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5439497 | Composites Part A: Applied Science and Manufacturing | 2017 | 11 Pages |
Abstract
Lightweight and multifunctional PMMA/Fe3O4@MWCNTs composite foams with density of 0.22-0.38 g/cm3 were fabricated by supercritical carbon dioxide (ScCO2) foaming process. Benefitting from the existence of microcellular structure and the Fe3O4@MWCNTs hybrids, the specific Electromagnetic interference shielding effectiveness (EMI SE) of obtained PMMA/Fe3O4@MWCNTs foams was significantly enhanced. The resulting foams with hybrids loading of 7 wt% displayed excellent specific EMI SE of 50 dB/(g/cm3) 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/Fe3O4@MWCNTs foams with superior EMI shielding performance to apply in the electronics and aerospace industries.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Hongming Zhang, Guangcheng Zhang, Jiantong Li, Xun Fan, Zhanxin Jing, Jianwei Li, Xuetao Shi,