Thermal behavior and flammability of epoxy composites based on multi-walled carbon nanotubes and expanded graphite: A comparative study

Alexander G. Bannov, Olga B. Nazarenko, Evgeny A. Maksimovskii, Maxim V. Popov, Irina S. Berdyugina

Research output: Contribution to journalArticlepeer-review

Abstract

Reduction of flammability and improvement of thermal stability of polymers during heating can be achieved by the introduction of fillers. Epoxy composites filled with different loadings of multi-walled carbon nanotubes (MWCNTs) and expanded graphite (EG) were prepared. The thermal oxidation stability of the prepared samples was investigated under heating in an oxidizing atmosphere using thermal analysis. The hardness was measured using the Shore D hardness test. The flammability of the prepared composites was evaluated by the ignition temperature and time-to-ignition. It was found that there was a rise in temperature corresponding to a 5% weight loss during heating for both epoxy/MWCNT and epoxy/EG composites compared to neat epoxy resin. The Shore D hardness of epoxy/MWCNT composites increased with content growth up to 0.1 wt.% and decreased with further concentration rise. The addition of MWCNTs and EG leads to an increase in the ignition temperature. It has been shown that MWCNTs improve the thermal behavior of epoxy resin in a low temperature region (below ~300C) whereas EG shows almost the same thermal behavior above 300C. The improvement of thermal properties can be achieved using MWCNTs and EG as fillers.

Original languageEnglish
Article number6928
Pages (from-to)1-13
Number of pages13
JournalApplied Sciences (Switzerland)
Volume10
Issue number19
DOIs
Publication statusPublished - 1 Oct 2020

Keywords

  • Epoxy composites
  • Exfoliated graphite
  • Expanded graphite
  • Flammability
  • Multi-walled carbon nanotubes
  • Thermal oxidative degradation

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

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