Thermal stability and fire retardancy of polyurea and epoxy nanocomposites using organically modified magadiite

Thirumal Mariappan, Deqi Yi, Arindam Chakraborty, Nikhil K. Singha, Charles A. Wilkie*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

The purpose of this study is to investigate the effect of the surface modification of a layered silicate (magadiite) on the flammability of both polyurea and amine-cured epoxy resin. Based on the surface chemistry of magadiite, both quaternary alkyl ammonium and silane modifier can be employed for the organo-modification. Nanocomposites of both polymers were prepared via ultrasound-assisted in situ polymerization. Dispersion of magadiite was investigated through X-ray diffraction and high-resolution transmission electron microscopy. Thermal stability and flammability were evaluated by thermogravimetric analysis and cone calorimetry, respectively. The addition of small amount of magadiite resulted in significant improvements in flame resistance with not much change in thermal stability for both polymers. Ammonium-modified magadiite improves the flame resistance, whereas silane modification helps to increase time to ignition of both polymers.

Original languageEnglish
Pages (from-to)346-361
Number of pages16
JournalJournal of Fire Sciences
Volume32
Issue number4
DOIs
Publication statusPublished - Jul 2014

Keywords

  • Polyurea
  • ammonium exchanged
  • cone calorimeter
  • epoxy
  • fire retardancy
  • magadiite
  • silane grafting
  • thermal properties

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