Influence of Graphene Nanoplatelet Lateral Size on the Electrical Conductivity and Electromagnetic Interference Shielding Performance of Polyester Nanocomposites
Polyester nanocomposites reinforced with graphene nanoplatelets (GnPs) with two different lateral sizes are prepared by high shear mixing, followed by compression molding. The effects of the size and concentration of GnP, as well as of the processing method, on the electrical conductivity and electr...
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doaj-a8d00a11abdb4171b8ff543d2cebcaa42021-08-06T15:30:14ZengMDPI AGPolymers2073-43602021-07-01132567256710.3390/polym13152567Influence of Graphene Nanoplatelet Lateral Size on the Electrical Conductivity and Electromagnetic Interference Shielding Performance of Polyester NanocompositesMilad Madinehei0Scheyla Kuester1Tatiana Kaydanova2Nima Moghimian3Éric David4Mechanical Engineering Department, École de Technologie Supérieure, 1100 Notre-Dame St W, Montréal, QC H3C 1K3, CanadaNanoXplore Inc., 4500 Boulevard Thimens, Saint-Laurent, QC H4R 2P2, CanadaNanoXplore Inc., 4500 Boulevard Thimens, Saint-Laurent, QC H4R 2P2, CanadaNanoXplore Inc., 4500 Boulevard Thimens, Saint-Laurent, QC H4R 2P2, CanadaMechanical Engineering Department, École de Technologie Supérieure, 1100 Notre-Dame St W, Montréal, QC H3C 1K3, CanadaPolyester nanocomposites reinforced with graphene nanoplatelets (GnPs) with two different lateral sizes are prepared by high shear mixing, followed by compression molding. The effects of the size and concentration of GnP, as well as of the processing method, on the electrical conductivity and electromagnetic interference (EMI) shielding behavior of these nanocomposites are experimentally investigated. The in-plane electrical conductivity of the nanocomposites with larger-size GnPs is approximately one order of magnitude higher than the cross-plane volume conductivity. According to the SEM images, the compression-induced alignments of GnPs is found to be responsible for this anisotropic behavior. The orientation of the small size GnPs in the composite is not influenced by the compression process as strongly, and consequently, the electrical conductivity of these nanocomposites exhibits only a slight anisotropy. The maximum EMI shielding effectiveness (SE) of 27 dB (reduction of 99.8% of the incident radiation) is achieved at 25 wt.% of the smaller-size GnP loading. Experimental results show that the EMI shielding mechanism of these composites has a strong dependency on the lateral dimension of GnPs. The non-aligned smaller-size GnPs are leveraged to obtain a relatively high absorption coefficient (≈40%). This absorption coefficient is superior to the existing single-filler bulk polymer composite with a similar thickness.https://www.mdpi.com/2073-4360/13/15/2567nanocompositegrapheneEMI shieldingelectrical propertiesabsorptionpolyester |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Milad Madinehei Scheyla Kuester Tatiana Kaydanova Nima Moghimian Éric David |
spellingShingle |
Milad Madinehei Scheyla Kuester Tatiana Kaydanova Nima Moghimian Éric David Influence of Graphene Nanoplatelet Lateral Size on the Electrical Conductivity and Electromagnetic Interference Shielding Performance of Polyester Nanocomposites Polymers nanocomposite graphene EMI shielding electrical properties absorption polyester |
author_facet |
Milad Madinehei Scheyla Kuester Tatiana Kaydanova Nima Moghimian Éric David |
author_sort |
Milad Madinehei |
title |
Influence of Graphene Nanoplatelet Lateral Size on the Electrical Conductivity and Electromagnetic Interference Shielding Performance of Polyester Nanocomposites |
title_short |
Influence of Graphene Nanoplatelet Lateral Size on the Electrical Conductivity and Electromagnetic Interference Shielding Performance of Polyester Nanocomposites |
title_full |
Influence of Graphene Nanoplatelet Lateral Size on the Electrical Conductivity and Electromagnetic Interference Shielding Performance of Polyester Nanocomposites |
title_fullStr |
Influence of Graphene Nanoplatelet Lateral Size on the Electrical Conductivity and Electromagnetic Interference Shielding Performance of Polyester Nanocomposites |
title_full_unstemmed |
Influence of Graphene Nanoplatelet Lateral Size on the Electrical Conductivity and Electromagnetic Interference Shielding Performance of Polyester Nanocomposites |
title_sort |
influence of graphene nanoplatelet lateral size on the electrical conductivity and electromagnetic interference shielding performance of polyester nanocomposites |
publisher |
MDPI AG |
series |
Polymers |
issn |
2073-4360 |
publishDate |
2021-07-01 |
description |
Polyester nanocomposites reinforced with graphene nanoplatelets (GnPs) with two different lateral sizes are prepared by high shear mixing, followed by compression molding. The effects of the size and concentration of GnP, as well as of the processing method, on the electrical conductivity and electromagnetic interference (EMI) shielding behavior of these nanocomposites are experimentally investigated. The in-plane electrical conductivity of the nanocomposites with larger-size GnPs is approximately one order of magnitude higher than the cross-plane volume conductivity. According to the SEM images, the compression-induced alignments of GnPs is found to be responsible for this anisotropic behavior. The orientation of the small size GnPs in the composite is not influenced by the compression process as strongly, and consequently, the electrical conductivity of these nanocomposites exhibits only a slight anisotropy. The maximum EMI shielding effectiveness (SE) of 27 dB (reduction of 99.8% of the incident radiation) is achieved at 25 wt.% of the smaller-size GnP loading. Experimental results show that the EMI shielding mechanism of these composites has a strong dependency on the lateral dimension of GnPs. The non-aligned smaller-size GnPs are leveraged to obtain a relatively high absorption coefficient (≈40%). This absorption coefficient is superior to the existing single-filler bulk polymer composite with a similar thickness. |
topic |
nanocomposite graphene EMI shielding electrical properties absorption polyester |
url |
https://www.mdpi.com/2073-4360/13/15/2567 |
work_keys_str_mv |
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