Study on electromagnetic interference shielding properties of ABS/CNTs/Fe3O4 composite and its bimodal foam

doi:10.19491/j.issn.1001-9278.2024.08.008

Abstract

Abstract:

In this study， acrylonitrile⁃butadiene⁃styrene （ABS）/carbon nanotubes （CNTs）/ferriferous oxide （Fe₃O₄） composite and its bimodal foams with excellent conductivity and electromagnetic interference shielding （EMI SE） were prepared by melt blending and supercritical carbon dioxide foaming technique， respectively. The effects of the mixture ratio and content of the two fillers on the foaming properties， electrical conductivity， dielectric properties and EMI SE of ABS composites and bimodal foams were studied. The experimental results indicated that the average cell size of ABS bimodal foams decreased with the gradual increase of CNTs and Fe₃O₄ contents， the average large cell size descended from 283.54 μm to 70.79 μm， and the average small cell size declined from 11.89 μm to 7.19 μm. While the cell density of large cells in ABS bimodal foams went from 2.88×10⁴ cell/cm³ to 2.51×10⁶ cell/cm³ and the cell density of small cells increased from 2.18×10⁸ cell/cm³ to 1.12×10⁹ cell/cm³. The electrical conductivity of ABS composites boosted from 0.304 1 S/cm to 1.360 8 S/cm， and the total EMI SE increased from 28.65 dB to 43.05 dB with the gradual increase of CNTs and Fe₃O₄ contents. After foaming， the electrical conductivity of ABS bimodal foams augmented from 0.002 7 S/cm to 0.065 4 S/cm， and the total EMI SE increased from 10.89 dB to 21.08 dB. The maximum specific electromagnetic shielding effectiveness of ABS composite and its bimodal foams was 41.33 dB/（g·cm^-3）.

Key words: acrylonitrile?butadiene?styrene, composite, supercritical carbon dioxide foaming, electrical conductivity, electromagnetic interference shielding

CLC Number:

TQ322

SUN He, HE Xin, LUO Tongyu, JI Xin, LIAO Qiling, ZHANG Yuxia, ZHOU Hongfu. Study on electromagnetic interference shielding properties of ABS/CNTs/Fe₃O₄ composite and its bimodal foam[J]. China Plastics, 2024, 38(8): 46-52.

Figures/Tables 11

样品名称	ABS/%	CNTs/%	Fe₃O₄/%	密度/g·cm^-3
C5F0	95	5	0	1.09
C5F10	85	5	10	1.13
C10F0	90	10	0	1.11
C10F10	80	10	10	1.23
C10F20	70	10	20	1.31

Tab.1. Experimental formula

Fig.1. Foaming mechanism of the ABS bimodal foams

Fig.2. SEM images of various ABS bimodal foams

样品名称	大泡孔尺寸/μm	小泡孔尺寸/μm	大泡孔的N₀/个·cm^-3	小泡孔的N₀/个·cm^-3	$V V E R$
BF⁃C5F0	283.54	11.89	2.88×10⁴	2.18×10⁸	2.86
BF⁃C5F10	204.99	9.15	7.02×10⁴	6.28×10⁸	2.69
BF⁃C10F0	252.65	10.54	3.26×10⁴	4.56×10⁸	2.77
BF⁃C10F10	104.93	8.52	1.28×10⁶	8.56×10⁸	2.61
BF⁃C10F20	70.79	7.19	2.51×10⁶	1.12×10⁹	2.56

样品名称	大泡孔尺寸/μm	小泡孔尺寸/μm	大泡孔的N₀/个·cm^-3	小泡孔的N₀/个·cm^-3	$V V E R$
BF⁃C5F0	283.54	11.89	2.88×10⁴	2.18×10⁸	2.86
BF⁃C5F10	204.99	9.15	7.02×10⁴	6.28×10⁸	2.69
BF⁃C10F0	252.65	10.54	3.26×10⁴	4.56×10⁸	2.77
BF⁃C10F10	104.93	8.52	1.28×10⁶	8.56×10⁸	2.61
BF⁃C10F20	70.79	7.19	2.51×10⁶	1.12×10⁹	2.56

Tab.2. Cell parameters of the ABS bimodal foams

Fig.3. Electrical conductivity of various ABS composites and their bimodal foams

Fig.4. ε'，ε''，μ' and μ'' of various ABS composites

Fig.5. ε'，ε''，μ' and μ'' of various ABS bimodal foams

Fig.6. EMI SE of various ABS composites

Fig.7. EMI SE of various ABS bimodal foams

样品名称	ρ_f/g·cm^-3	ABS复合材料在 8.2 GHz的SE_T/dB	ABS双峰泡沫在 8.2 GHz的SE_T/dB	ABS复合材料的 SSE/dB·（g·cm^-3）^-1	ABS双峰泡沫的 SSE/dB·（g·cm^-3）^-1
C5F0	0.38	22.22	10.89	20.38	28.65
C5F10	0.42	25.87	12.56	22.11	29.90
C10F0	0.40	33.44	15.36	29.59	38.40
C10F10	0.47	38.82	18.68	31.56	39.74
C10F20	0.51	43.05	21.08	32.86	41.33

Tab.3. SSE of the ABS composites and their bimodal foams at 8.2 GHz

Fig.8. Electromagnetic shielding mechanism of the ABS bimodal foams

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Study on electromagnetic interference shielding properties of ABS/CNTs/Fe₃O₄ composite and its bimodal foam

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Figures/Tables 11

References 23

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