Abstract
In this work, three representative cell structures (nano-, micro- and regular cells) were designed and tailored in acrylonitrile-butadiene-styrene (ABS) composite foams by altering carbon nanotubes (CNTs) content and adjusting foaming temperature in the presence of supercritical CO2. Compared with pure ABS, nearly 2 orders of magnitude increment in the storage modulus and complex viscosity of ABS/CNTs composites and about 9 orders of magnitude improvement in their electrical conductivity were obtained. Compared with its unfoamed sample, the electromagnetic interference specific shielding effectiveness (SSE) of ABS/CNTs7 foam prepared at 145 °C was enhanced from 22.75 to 26.60 dB cm3/g. A specific interface area model was established to discuss the electromagnetic absorption of ABS/CNTs foams with different cell structures. The results demonstrated that the larger the cell size, the higher the specific interface area of different ABS foams with same CNTs content, as a result, higher SSE was achieved.
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