Composites of phenolic resin with expanded graphite and conductive carbon black

Carmen G. Renda1*, Jeferson A. Dias1, Roberto Bertholdo2, Alessandra A. Lucas1

1Department Materials Engineering, DEMA, Federal University of São Carlos, Washington Luis Highway (SP-310), Km 235, São Carlos-SP, 13565-905, Brazil

2Science and Technology Institute, Federal University of Alfenas, José Aurélio Vilela Highway, 11999 (BR-267), Km 533, Poços de Caldas-MG, 37715-400, Brazil

Adv. Mater. Lett., 2018, 9 (2), pp 107-111

DOI: 10.5185/amlett.2018.1817

Publication Date (Web): May 16, 2018

E-mail: carmengreice@ppgcem.ufscar.br

Abstract


The phenolic resin (PR) is widely studied as matrix for composites due to its promising mechanical properties and chemical stability. However, which regard to electrical conduction, PR is a typical insulator (electrical conductivity around 10-12 S.cm-1), limiting its utilization for electric conduction’ applications. Expanded graphite (EG) and conductive carbon black (CB) are fillers that have been utilized to increase the electrical conductivity of several polymers, but they have not yet been enough studied to composites materials with PR. Thus, this study aims at asses to produce composites of PR and EG or CB (2% w / w) and verify the influence these fillers on the composites’ electrical properties. The composites were analyzed by FT-IR (Fourier Transform-Infrared Spectroscopy), Impedance Spectroscopy (IS) and Scanning Electron Microscopy (SEM). It was verified that the electric conductivity of the PRs increased due to fillers. The composite PR/CB showed electric conductivity about five orders of magnitude higher than the PR. On the other hand, the composite PR/EG showed greatest electrical conductivity, about seven orders of magnitude higher than the PR (1.1x10-5 S.cm-1). These results have shown the efficacy of those fillers in the increase of the electrical conduction in PR-based composites. Therefore, these composites materials have potential to be used as Electromagnetic Interference (EMI) shielding and electrostatic discharge (ESD). 

Keywords

Phenolic resin, graphite, carbon black, electrical conductivity.

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