TY - JOUR
T1 - Study on foamability and electromagnetic interference shielding effectiveness of supercritical CO 2 foaming epoxy/rubber/MWCNTs composite
AU - Fan, Xun
AU - Zhang, Guangcheng
AU - Li, Jiantong
AU - Shang, Zhengyang
AU - Zhang, Hongming
AU - Gao, Qiang
AU - Qin, Jianbin
AU - Shi, Xuetao
N1 - Publisher Copyright:
© 2019
PY - 2019/6
Y1 - 2019/6
N2 - 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 (SCCO 2 ). 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 ∼400nm and cell density of ∼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.
AB - 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 (SCCO 2 ). 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 ∼400nm and cell density of ∼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.
KW - Bimodal cellular morphology
KW - Electromagnetic interference shielding
KW - Epoxy composite foam
KW - Supercritical CO
UR - https://www.scopus.com/pages/publications/85062998377
U2 - 10.1016/j.compositesa.2019.03.008
DO - 10.1016/j.compositesa.2019.03.008
M3 - 文章
AN - SCOPUS:85062998377
SN - 1359-835X
VL - 121
SP - 64
EP - 73
JO - Composites Part A: Applied Science and Manufacturing
JF - Composites Part A: Applied Science and Manufacturing
ER -