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Structure design of multi-layered ABS/CNTs composite foams for EMI shielding application with low reflection and high absorption characteristics.
- Source :
-
Applied Surface Science . Jul2023, Vol. 624, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- [Display omitted] • ABS/CNTs foams were fabricated by a melt blending and scCO 2 foaming technology. • Three typically pores (nano-pores, micro-pores and regular pores) were produced. • Multi-layered foams with various pore structures and same CNTs content were studied. • The positive pore gradient structure foam exhibited the best absorption coefficient. • The sandwich structure had the characteristics of low reflection and high absorption. The low-reflection and high-absorption features for electromagnetic (EM) waves are the key and significant requirements for fabricating efficient EM interference (EMI) shielding polymer-based composite foams. Herein, single-layered acrylonitrile–butadienestyrene (ABS)/carbon nanotubes (CNTs) foams with three representative pore structures (nano-pores, micro-pores and regular pores) were produced via supercritical CO 2 foaming technology. Subsequently, they were stacked together to obtain multi-layered ABS/CNTs foams through structural design for achieving the high absorption and low reflection characteristics described above. Among all the unfoamed and foamed ABS/CNTs specimens, nano-porous ABS/CNTs foams could reach the maximum electrical conductivity of 3.7 S/m. The multi-layered ABS/CNTs foam with positive pore gradient structure exhibited the best EM wave absorption coefficient of 0.90. The sandwich structure formed in ABS/CNTs foam by sandwiching a middle layer of regular porous foam between nano-porous foam and micro-porous foam increased EM wave absorption properties, owing to the generation of constructive interference. This work provides new insight and methodology for the design and fabrication of multi-layered EMI shielding polymer-based composite foams with low reflection and high absorption. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 624
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 163164078
- Full Text :
- https://doi.org/10.1016/j.apsusc.2023.157168