Epoxy resin/graphene nanoplatelets composites applied to galvanized steel with outstanding microwave absorber performance
Author:
Carvalho de Oliveira Henrique1, Lavoratti Alessandra1, Miranda Pereira Iaci2, Indrusiak Silva Tamara2, Soares Bluma Guenther3, Rossa Beltrami Lilian Vanessa1ORCID, José Zattera Ademir1
Affiliation:
1. Programa de Pós-Graduação em Engenharia de Processos e Tecnologias (PGEPROTEC) , Universidade de Caxias do Sul (UCS) , Rua Francisco Getúlio Vargas, 1130 Bairro Petrópolis , Caxias do Sul 95070-560 , Brazil 2. Centro Tecnológico do Exército (CETEx) , Rio de Janeiro , Brazil 3. Instituto de Macromoléculas, Universidade Federal do Rio de Janeiro , Rio de Janeiro , Brazil
Abstract
Abstract
The necessity of new electromagnetic interference shielding materials has expanded scientific research, especially with regard to microwave frequency range (X-band). In this context, polymer-based composites with nanoparticles – such as graphene – are promising electromagnetic interference shielding materials. In this work, epoxy resin/graphene nanoplatelets (NPG) composites with 0.10, 0.25 and 0.5% w/w were developed and applied to galvanized steel substrates. Dynamic-mechanical tests showed that the addition of NGPs increased the resin rigidity due to molecular restrictions of the organic chains imposed by the NPG. With the increase of the NPG concentration to 0.50%, the impact strength and the adhesion of the composites significantly decreased due to the formation and propagation of large cracks, followed by delamination. The epoxy resin sample containing 0.25% NPG presented the best microwave absorber performance with an increase of 48% in the attenuated energy and 80% in the reflection loss, respectively. Moreover, this sample extended the microwave absorption range to 10 GHz.
Publisher
Walter de Gruyter GmbH
Subject
Materials Chemistry,Polymers and Plastics,General Chemical Engineering
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