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| Naji, M. |
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| Motta, Antonella |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Bih, L. |
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| Casati, R. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Guenther Soares, Bluma
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Publications (6/6 displayed)
- 2021Ionic liquids as dispersing agents of graphene nanoplatelets in poly(methyl methacrylate) composites with microwave absorbing propertiescitations
- 2018Hybrid composites of <scp>ABS</scp> with carbonaceous fillers for electromagnetic shielding applicationscitations
- 2016Organically modified silica (ORMOSIL) bearing imidazolium Based ionic liquid prepared by hydrolysis/co-condensation of silane precursors: Synthesis, characterization and use in epoxy networkscitations
- 2015Novel electrically conductive polyurethane/montmorillonite-polypyrrole nanocompositescitations
- 2014Ionic Liquids as Reactive Additives for the Preparation and Modification of Epoxy Networkscitations
- 2014Silylated montmorillonite as nanofillers for plasticized PVC nanocomposites: Effect of the plasticizercitations
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article
Ionic liquids as dispersing agents of graphene nanoplatelets in poly(methyl methacrylate) composites with microwave absorbing properties
Abstract
<jats:title>Abstract</jats:title><jats:p>Graphene nanoplatelets (GNP) is noncovalently functionalized with imidazolium‐, pyridinium‐, and vinyl‐pyridinium‐based ionic liquids containing bromide or bis(trifluoromethyl‐sulfonyl)imide (TFSI) as the counteranions, and used to prepare poly (methyl methacrylate) (PMMA) nanocomposites by solution casting approach followed by compression molding technique. The PMMA composites loaded with 1.9 and 1.8 wt% of GNP in PMMA/GNP composite and PMMA/GNP/ionic liquids, respectively, were characterized by melting viscosity, thermogravimetric analysis and AC electrical conductivity (σ<jats:sub>AC</jats:sub>). The microwave absorption properties at the X‐band (8.2–12.4 GHz) frequency were measured for systems with 1 mm thickness using the metal‐backed configuration. PMMA nanocomposites loaded with GNP/N‐dodecyl‐4‐vinyl‐pyridinium.TFSI (C<jats:sub>12</jats:sub>ViPy.TFSI) displayed higher thermal stability and higher σ<jats:sub>AC</jats:sub>. This system also presented the best response in terms of microwave absorbing properties, with minimum reflection loss (RL) of around −6 dB at 8.7 GHz. Triple layered composite structures with layers of different conductivities and different stacking orders were also investigated in terms of reflection loss. Broadband absorption with minimum RL ≤ −10 dB (90% of electromagnetic attenuation) in the frequency between 10.2 and 12.4 GHz and better absorbing effectiveness were observed for the PMMA/GNP‐PMMA/GNP/C<jats:sub>12</jats:sub>ViPy.TFSI‐PMMA/GNP/C<jats:sub>12</jats:sub>ViPy.Br triple‐layered system with 3 mm thickness.</jats:p>