Journal
MATERIALS LETTERS
Volume 230, Issue -, Pages 157-160Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.07.094
Keywords
Porous materials; Microstructure; Electrical properties; EMI shielding
Funding
- National Postdoctoral Program for Innovation Talents [BX201700079]
- China Postdoctoral Science Foundation [2017M620371]
- Foundation for Distinguished Young Talents in Higher Education of Guangdong Province [2017KQNCX001]
- Key Laboratory for Ultrafine Materails of Ministry of Education [2017CX001]
- Education Office of Henan Province Department Key Research Program of Colleges Universities [13A130790]
- Foundation for Youth Teachers in Colleges & Universities of Henan Province [2015GGJS-109]
- Natural Science Foundation of Zhejiang Province [LY17E030006, LY18E030009]
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Conductive polymer composite (CPC) foams have been considered as a promising electromagnetic interference (EMI) shielding materials because of the advantages of the lightweight, low-cost and easy preparation process. However, most of the currently reported CPC foams were prepared by batch foaming process. Insight of large-scale and low-cost production of CPC foams, we presented a feasible extrusion foaming strategy of polystyrene (PS) composites with micro-graphite (mGr) or multi-wall carbon nanotube (MWCNT) using supercritical carbon dioxide (Sc-CO2) as the physical blowing agent for EMI shielding application. The composite foams showed elongated cell morphology; meanwhile, the compressive strength and electrical conductivity were significantly increased. These composite foams presented a remarkable high performance of EMI shielding efficiency, corresponding average EMI SE of 22 dB and specific EMI SE of 92 dB/(g/cm(3)). In comparison between mGr and MWCNT, PS/mGr composite foams showed better EMI SE than that of PS/MWCNT composite foams at the same filler content due to the lower foam density of PS/mGr composite foams. Considering the feasible, large-scale and low-cost production process, these CPC foams are expected to apply in high performance EMI shielding areas. (C) 2018 Elsevier B.V. All rights reserved.
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