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Article

On the Synergistic Effect of Multi-Walled Carbon Nanotubes and Graphene Nanoplatelets to Enhance the Functional Properties of SLS 3D-Printed Elastomeric Structures

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Institute of Polymers, Composites and Biomaterials, National Research Council, Via Campi Flegrei, 34-80078 Pozzuoli (NA), Italy
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Institute of Polymers, Composites and Biomaterials, National Research Council, Via Previati, 1, 23900 Lecco, Italy
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Institute of Polymers, Composites and Biomaterials, National Research Council Viale J.F. Kennedy, 54-80125 Naples, Italy
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State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065, China
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Institute for Nuclear Problems of Belarusian State University, Bobruiskaya 11, 220006 Minsk, Belarus
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Physics Faculty, Vilnius University, Sauletekio 9, LT-10222 Vilnius, Lithuania
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Radiophysics department, Tomsk State University, Lenin Avenue 36, 634050 Tomsk, Russia
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Institute of Photonics, University of Eastern Finland, Yliopistokatu 7, FI-80101 Joensuu, Finland
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Institute of Polymers, Composites and Biomaterials, National Research Council, P. le Enrico Fermi, 1-80055 Portici (NA), Italy
*
Authors to whom correspondence should be addressed.
These authors contributed equally to the work.
Polymers 2020, 12(8), 1841; https://doi.org/10.3390/polym12081841
Received: 30 June 2020 / Revised: 28 July 2020 / Accepted: 11 August 2020 / Published: 17 August 2020
Elastomer-based porous structures realized by selective laser sintering (SLS) are emerging as a new class of attractive multifunctional materials. Herein, a thermoplastic polyurethane (TPU) powder for SLS was modified by 1 wt.% multi-walled carbon nanotube (MWCNTs) or a mixture of MWCNTs and graphene (GE) nanoparticles (70/30 wt/wt) in order to investigate on both the synergistic effect provided by the two conductive nanostructured carbonaceous fillers and the correlation between formulation, morphology, and final properties of SLS printed porous structures. In detail, porous structures with a porosity ranging from 20% to 60% were designed using Diamond (D) and Gyroid (G) unit cells. Results showed that the carbonaceous fillers improve the thermal stability of the elastomeric matrix. Furthermore, the TPU/1 wt.% MWCNTs-GE-based porous structures exhibit excellent electrical conductivity and mechanical strength. In particular, all porous structures exhibit a robust negative piezoresistive behavior, as demonstrated from the gauge factor (GF) values that reach values of about −13 at 8% strain. Furthermore, the G20 porous structures (20% of porosity) exhibit microwave absorption coefficients ranging from 0.70 to 0.91 in the 12–18 GHz region and close to 1 at THz frequencies (300 GHz–1 THz). Results show that the simultaneous presence of MWCNTs and GE brings a significant enhancement of specific functional properties of the porous structures, which are proposed as potential actuators with relevant electro-magnetic interference (EMI) shielding properties. View Full-Text
Keywords: selective laser sintering; piezoresistivity; thermoplastic polyurethane (TPU); carbonaceous filler; EMI shielding selective laser sintering; piezoresistivity; thermoplastic polyurethane (TPU); carbonaceous filler; EMI shielding
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MDPI and ACS Style

Rollo, G.; Ronca, A.; Cerruti, P.; Gan, X.P.; Fei, G.; Xia, H.; Gorokhov, G.; Bychanok, D.; Kuzhir, P.; Lavorgna, M.; Ambrosio, L. On the Synergistic Effect of Multi-Walled Carbon Nanotubes and Graphene Nanoplatelets to Enhance the Functional Properties of SLS 3D-Printed Elastomeric Structures. Polymers 2020, 12, 1841. https://doi.org/10.3390/polym12081841

AMA Style

Rollo G, Ronca A, Cerruti P, Gan XP, Fei G, Xia H, Gorokhov G, Bychanok D, Kuzhir P, Lavorgna M, Ambrosio L. On the Synergistic Effect of Multi-Walled Carbon Nanotubes and Graphene Nanoplatelets to Enhance the Functional Properties of SLS 3D-Printed Elastomeric Structures. Polymers. 2020; 12(8):1841. https://doi.org/10.3390/polym12081841

Chicago/Turabian Style

Rollo, Gennaro, Alfredo Ronca, Pierfrancesco Cerruti, Xin P. Gan, Guoxia Fei, Hesheng Xia, Gleb Gorokhov, Dzmitry Bychanok, Polina Kuzhir, Marino Lavorgna, and Luigi Ambrosio. 2020. "On the Synergistic Effect of Multi-Walled Carbon Nanotubes and Graphene Nanoplatelets to Enhance the Functional Properties of SLS 3D-Printed Elastomeric Structures" Polymers 12, no. 8: 1841. https://doi.org/10.3390/polym12081841

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