Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 138, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2020.106059
Keywords
Conductive polymer composites; Porous double-percolated structure; Electromagnetic interference shielding; Supercritical carbon dioxide foaming
Funding
- National Natural Science Foundation of China [51773138, 51721091]
- Fundamental Research Funds for the Central Universities, China
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Porous conducive polymer composites (CPCs) are supposed to be the most prospective substitutes for metal-based materials in the field of electromagnetic interference (EMI) shielding but are still confronted with the challenge of poor performance. To solve the dilemma, we firstly design a porous double-percolated structure in co-continuous polystyrene (PS)/polymethyl methacrylate (PMMA)/MWCNT system with a judicious combination of melt blending and supercritical carbon dioxide (scCO(2)) foaming. At thickness of 2 mm and MWCNT content of 1.61 vol%, the porous composite possessed low-density (0.4 g/cm(3)), high electrical conductivity (1.64 S/m) and efficient EMI shielding performance (23.08 dB). Moreover, the percolation threshold decreased from 0.18 to 0.14 vol%, and the specific EMI SE increased from 37.79 to 57.7 dB.cm(3)/g compared to the solid counterparts. This work offers a novel idea for the design of lightweight EMI shielding materials with high performance, exerting tremendous potential in electronics and aerospace fields.
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