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This work assesses the influence of material composition as well as printing parameters on the electromagnetic interference shielding effectiveness (EMI SE) of polymeric composites based on poly(acrylonitrile-co-butadiene-co-styrene) (ABS) filled with carbon nanotubes (CNT) and/or carbon black (CB), manufactured via fused filament fabrication (FFF). In the study three compositions were analyzed, ABS with 5 wt% of CNT, ABS with 5 wt% of CB, and a hybrid composite with also 5 wt% total of additive but a (75:25) fraction of CNT:CB. The materials properties were evaluated on samples printed in three different growing directions, horizontal concentric (HC), perpendicular concentric (PC) and horizontal at ±45° (H45). The electrical conductivity of the printed samples are highly influenced by the CNT presence in the composition, and increased with its incorporation. The electrical conductivity values for ABS with 5 wt% of CB were in the range of 10−12 S. cm-1, while for hybrid composite and ABS with 5 wt% of CNT values between 10-8 and 10-5 S. cm-1 were observed. The EMI SE, for all patterns of printed samples, also increased with the increase of CNT amount and layer thickness, with values of around -16 dB for the composite with only CNT sample, and -14 dB for the hybrid sample. The PC pattern shows high anisotropy among the studied samples, presenting the highest EMI SE value for PC when measured horizontally (PC-H) and the lowest value when measured vertically (PC-V). The results obtained in this study show the real potential of applying FFF for the manufacturing of ABS/carbonaceous composites to be use in EMI shielding applications.

Effect of printing parameters on the electromagnetic shielding efficiency of ABS/carbonaceous-filler composites manufactured via filament fused fabrication / Schmitz, D. P.; Dul, S.; Ramoa, S. D. A. S.; Soares, B. G.; Barra, G. M. O.; Pegoretti, A.. - In: JOURNAL OF MANUFACTURING PROCESSES. - ISSN 1526-6125. - 65(2021), pp. 12-19. [10.1016/j.jmapro.2021.02.051]

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