Effect of printing parameters on the electromagnetic shielding efficiency of ABS/carbonaceous-filler composites manufactured via filament fused fabrication

Schmitz, Débora Pereira; Dul, Sithiprumnea; Ramôa, Sílvia D.A.S.; Soares, Bluma G.; Barra, Guilherme Mariz de Oliveira; Pegoretti, Alessandro

doi:10.1016/j.jmapro.2021.02.051

Cited by 24 publications

(13 citation statements)

References 17 publications

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“…Some related works using other polymer matrices have also found that the SE A component may not be directly proportional to the content of nanofillers added. 18,32,34,64…”

Section: Resultsmentioning

confidence: 99%

“…Some related works using other polymer matrices have also found that the SE A component may not be directly proportional to the content of nanofillers added. 18,32,34,64 The attenuation results of hybrids indicated that GRM with the lower number of layers and lateral size (GRM2) might be more efficient once these fillers were better dispersed into the polymer matrix and presented a higher surficial area to interact with the MWCNT. The attenuation behavior for the GRM with an elevated number of layers and higher lateral size (GRM 1 -Nanographite) was related to the MWCNT content because of the less surficial area and a lower dispersion in the PC/ABS.…”

Section: Electromagnetic Interference Shieldingmentioning

confidence: 99%

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Role of adding carbon nanotubes in the electric and electromagnetic shielding behaviors of three different types of graphene in hybrid nanocomposites

Anjos

Moura

Antonelli

et al. 2022

Journal of Thermoplastic Composite Materials

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Graphene-related materials (GRM) are promising materials to improve mechanical, electrical, and optical polymer properties. Adding multi-wall carbon nanotubes (MWCNT) on GRM nanocomposites promotes synergistic effects on its electrical properties and electromagnetic interference shielding effectiveness (EMI SE). This study focused on evaluating the addition of MWCNT on three different polycarbonate (PC)/acrylonitrile butadiene styrene (ABS)/GRM nanocomposites. These hybrid nanocomposites were prepared by melt mixing using extrusion and injection-mold processes. The morphologies of the nanocomposites were evaluated by field emission gun scanning electron microscopy (FEG-SEM), and their proprieties were characterized by X-ray diffraction (XRD), oscillatory rheological, dielectric spectroscopy, and EMI SE analyses. The electrical behavior of all hybrid nanocomposites was anisotropic due to the injection-molded preparation process. The lateral size, thickness, and production method of the GRM were indicated to be critical factors for the electrical and EMI SE behaviors of these composites. The nanocomposites with GRM2, which had the smallest lateral size and thickness (graphene nanoplatelets), promoted total attenuation levels around 20 dB with 1.5 wt% of MWCNT, matching the EMI SE required for some commercial applications.

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“…Some related works using other polymer matrices have also found that the SE A component may not be directly proportional to the content of nanofillers added. 18,32,34,64…”

Section: Resultsmentioning

confidence: 99%

Section: Electromagnetic Interference Shieldingmentioning

confidence: 99%

Role of adding carbon nanotubes in the electric and electromagnetic shielding behaviors of three different types of graphene in hybrid nanocomposites

Anjos

Moura

Antonelli

et al. 2022

Journal of Thermoplastic Composite Materials

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“…ECPCs offer also the advantages of light weight, ease of processing, corrosion resistance, and low cost 2–6,8,13,17,19 . ECPCs containing intrinsically conducting polymers, carbonaceous fillers, such as carbon nanotubes, carbon black, graphene, and carbon fibers, have been widely studied as EMI shielding materials 1,6,8,9,18,20 …”

Section: Introductionmentioning

confidence: 99%

“…However, a manufacturing technique for large‐scale production with freedom in design for parts with complex geometries is still a challenge. In this framework, although the availability of fused filament fabrication (FFF) techniques is getting much attention for the fabrication of ECPCs for EMI shielding applications, several challenges have still to be solved 1,3–6,15,19,20 . The EMI shielding effectiveness depends on several factors including the electrical conductivity of the filler, dielectric constant, and aspect ratio 14 .…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5][6]8,13,17,19 ECPCs containing intrinsically conducting polymers, carbonaceous fillers, such as carbon nanotubes, carbon black, graphene, and carbon fibers, have been widely studied as EMI shielding materials. 1,6,8,9,18,20 In this context, many investigations have been carried out aiming at reducing the electrical percolation threshold of ECPCs in order to achieve high electrical conductivity values with the lowest content of conductive filler, thus preserving the mechanical properties and processability of the polymeric matrix. 16,21 Among the various adopted strategies, the preparation of ECPCs based on polymeric matrices composed of immiscible polymer blends in order to selectively localize the conductive filler in one of the polymer phases or at the interface of the polymeric blend is an investigated approach to reduce the percolation threshold of ECPCs.…”

Section: Introductionmentioning

confidence: 99%

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Poly(vinylidene fluoride) and thermoplastic polyurethane composites filled with carbon black‐polypyrrole for electromagnetic shielding applications

Bertolini,

Ramoa,

Pereira

et al. 2023

Polymers for Advanced Techs

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This study aims to investigate the electromagnetic interference shielding properties of composites based on immiscible polymer blends of poly(vinylidene fluoride) (PVDF) and thermoplastic polyurethane (TPU) filled with carbon black doped with polypyrrole (CB‐PPy) prepared by compression molding and fused filament fabrication. Composites of PVDF/CB‐PPy and TPU/CB‐PPy were also prepared for comparison. Rheological measurements showed that although the rheological behavior of PVDF/TPU composites was an intermediate behavior between PVDF/CB‐PPy and TPU/CB‐PPy composites, the effect of the conductive filler was much more pronounced in PVDF than in TPU. Moreover, the addition of CB‐PPy was found to increase the storage modulus of the composites leading to more rigid materials, and to decrease the Tg values of the composites due to the reduction of the mobility of the polymeric chains. In addition, PVDF/TPU composites presented an intermediate behavior when compared to composites based on the neat polymers demonstrating that the addition of TPU to PVDF contributes to the development of composites with improved flexibility. Furthermore, the addition of CB‐PPy increased the electrical conductivity of all composites. However, the electrical conductivity of PVDF/TPU 50/50 vol% co‐continuous blends was higher than the electrical conductivity of PVDF/TPU 38/62 vol% composites with the same amount of conductive filler. Composites with higher electrical conductivity showed better shielding from electromagnetic radiation. As expected, composites based on the co‐continuous blend displayed higher EMI shielding efficiency than the 38/62 vol% composites. The main mechanism of shielding was absorption for all composites. Overall, composites based on the PVDF/TPU 50/50 vol% co‐continuous blend showed a better combination of EMI shielding efficiency and mechanical properties. Moreover, specimens prepared by fused filament fabrication displayed diminished electrical conductivity and EMI‐SE responses when compared to compression‐molded samples with the same composition. This difference is attributed to the presence of voids, defects, and overlapping layers, which can hamper the electron flow.

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Emerging Research in Conductive Materials for Fused Filament Fabrication: A Critical Review

Simunec¹,

Sola²

2022

Adv Eng Mater

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The progress of Industry 4.0 and the advancement of robotic design are revealing a significant gap in the capabilities of current manufacturing techniques and the selection of materials that are available in electronics. Present‐day electrical systems largely rely on metals, but there is a driving need to develop new electrically conductive objects with a wide range of material properties, including expanded flexibility and softness, and with increasingly complex geometries. Electrically conductive composites can replace traditional metal‐based systems. In particular, thermoplastic composites become electrically conductive with the incorporation of conductive fillers or polymers while retaining to a large extent the processability of the thermoplastic matrix. This is where fused filament fabrication (FFF), an additive manufacturing (AM) technique capable of processing a variety of thermoplastic‐matrix feedstock materials, can be leveraged to create electrically conductive objects with new functionalities. While there is an increasing number of publications describing the FFF of electrical objects such as sensors and circuits, there is no comprehensive review outlining the functioning mechanisms, drawbacks, and advantages of FFF as applied to conductive materials. The present review fills this lacuna by offering a critical analysis of the specific challenges and solutions to promote FFF of electrically conductive polymers and composites.

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Effect of printing parameters on the electromagnetic shielding efficiency of ABS/carbonaceous-filler composites manufactured via filament fused fabrication

Cited by 24 publications

References 17 publications

Role of adding carbon nanotubes in the electric and electromagnetic shielding behaviors of three different types of graphene in hybrid nanocomposites

Role of adding carbon nanotubes in the electric and electromagnetic shielding behaviors of three different types of graphene in hybrid nanocomposites

Poly(vinylidene fluoride) and thermoplastic polyurethane composites filled with carbon black‐polypyrrole for electromagnetic shielding applications

Emerging Research in Conductive Materials for Fused Filament Fabrication: A Critical Review

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