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Licensed Unlicensed Requires Authentication Published online by De Gruyter May 20, 2022

Epoxy resin/graphene nanoplatelets composites applied to galvanized steel with outstanding microwave absorber performance

Henrique Carvalho de Oliveira, Alessandra Lavoratti, Iaci Miranda Pereira, Tamara Indrusiak Silva, Bluma Guenther Soares, Lilian Vanessa Rossa Beltrami ORCID logo and Ademir José Zattera

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.


Corresponding author: Lilian Vanessa Rossa Beltrami, 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, E-mail:

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: The authors would like to thank CAPES (Brazilian Coordination for the improvement of higher education personnel) and CNPq (the Brazilian National Council for Scientific and Technological Development) for the financial support.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2021-07-28
Accepted: 2022-03-25
Published Online: 2022-05-20

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