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Polymers 2016, 8(8), 272; doi:10.3390/polym8080272

Electromagnetic and Dynamic Mechanical Properties of Epoxy and Vinylester-Based Composites Filled with Graphene Nanoplatelets

1
Department of Astronautics, Electrical and Energy Engineering, Sapienza University of Rome, 00184 Rome, Italy
2
Research Center for Nanotechnology applied to Engineering, Sapienza University of Rome, 00184 Rome, Italy
3
Institute of Polymer Science and Technology ICTP-CSIC, Consejo Superior de Investigaciones Científicas CSIC, 28006 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Ton Peijs
Received: 29 May 2016 / Revised: 18 July 2016 / Accepted: 21 July 2016 / Published: 28 July 2016
View Full-Text   |   Download PDF [5231 KB, uploaded 28 July 2016]   |  

Abstract

Development of epoxy or epoxy-based vinyl ester composites with improved mechanical and electromagnetic properties, filled with carbon-based nanomaterials, is of crucial interest for use in aerospace applications as radar absorbing materials at radio frequency. Numerous studies have highlighted the fact that the effective functional properties of this class of polymer composites are strongly dependent on the production process, which affects the dispersion of the nanofiller in the polymer matrix and the formation of micro-sized aggregations, degrading the final properties of the composite. The assessment of the presence of nanofiller aggregation in a composite through microscopy investigations is quite inefficient in the case of large scale applications, and in general provides local information about the aggregation state of the nanofiller rather than an effective representation of the degradation of the functional properties of the composite due to the presence of the aggregates. In this paper, we investigate the mechanical, electrical, and electromagnetic properties of thermosetting polymer composites filled with graphene nanoplatelets (GNPs). Moreover, we propose a novel approach based on measurements of the dielectric permittivity of the composite in the 8–12 GHz range in order to assess the presence of nanofiller aggregates and to estimate their average size and dimensions. View Full-Text
Keywords: polymer composites; graphene nanoplatelets; radar absorbing materials; electromagnetic properties; DC electrical conductivity; percolation threshold; mechanical properties; effective dielectric permittivity; DMTA polymer composites; graphene nanoplatelets; radar absorbing materials; electromagnetic properties; DC electrical conductivity; percolation threshold; mechanical properties; effective dielectric permittivity; DMTA
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Marra, F.; D’Aloia, A.G.; Tamburrano, A.; Ochando, I.M.; De Bellis, G.; Ellis, G.; Sarto, M.S. Electromagnetic and Dynamic Mechanical Properties of Epoxy and Vinylester-Based Composites Filled with Graphene Nanoplatelets. Polymers 2016, 8, 272.

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