Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 121, Issue -, Pages 64-73Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2019.03.008
Keywords
Epoxy composite foam; Supercritical CO2; Bimodal cellular morphology; Electromagnetic interference shielding
Funding
- National Natural Science Foundation of China [51773170]
- Seed Foundation of Innovation and Creation for Graduate Student in Northwestern Polytechnical University, China [Z2017200]
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The functional multi-walled carbon nanotubes (fMWCNTs) and liquid carboxy-terminated butadiene-acrylonitrile copolymer (CTBN) were incorporated into epoxy (EP) resin to fabricate thermosetting composites, which were foamed using supercritical carbon dioxide (SCCO2). The foamability, electrical conductivity and electromagnetic interference (EMI) shielding effectiveness (SE) of foams were discussed. Owing to the heterogeneous nucleation caused by carbon nanotube, the average cell size of similar to 400nm and cell density of similar to 10(12) cells/cm(-3) were obtained, resulting in the excellent foamability of EP-CTBN-fMWCNTs systems. The biaxial stretching during cell growing facilitates fMWCNTs to align, forming 2D conductive networks, and resulting in the improvement of electrical property. The composite foam with fMWCNTs content of 5.0 wt% possesses EMI SE of 22.90 dB and specific EMI SE of 37.54 dB/(g cm(3)), which attributes to its high electrical conductivity of 0.43 S/m and cellular morphologies that made electromagnetic microwaves multi-reflect from one cell to another and then be attenuated by conductive filler.
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