Complex activity of clay and CNT particles in flame retarded EVA copolymer

B. B. Marosföi, G. Marosi, A. Szép, P. Anna, S. Keszei, B. J. Nagy, H. Martvonova, I. Sajó

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Interface modifications optimized for fire retardancy require detailed research. Confocal Raman microscopy was used to analyze the degradation locally in the area of the nanotube and clay additives. The double-walled carbon nanotube (DWCNT), containing Co catalyst residue, accelerates the deacetylation process of poly(ethylene-co-vinylacetate) (EVA) considerably, while the montmorillonite (MMT) has no significant influence under static circumstances. The compounding process influences the effect of MMT, which causes partial crosslinking in EVA during the compounding. This mechanochemical reaction is catalyzed by uncovered MMT particles, while organophillized MMT promotes the charring process. Inorganic surface modification with various metal ions has also some stabilizing effect. Spray drying of MMT results in microparticles of increased surface area and improved thermal stability of the EVA system. The lowest rate of flame spreading was achieved using uncoated MMT, while coating with cationic surfactant was most efficient for hindering dripping. The rate of heat release (RHR) of the organically modified and the spray dried MMT was approximately the same. The combined organic-inorganic modified clay moderates both the dripping and the flame spreading in the EVA.

Original languageEnglish
Pages (from-to)255-262
Number of pages8
JournalPolymers for Advanced Technologies
Volume17
Issue number4
DOIs
Publication statusPublished - Apr 2006

Fingerprint

Bentonite
Clay minerals
Ethylene
Clay
Copolymers
Spray drying
Carbon Nanotubes
Cationic surfactants
clay
ethylene
Crosslinking
Nanotubes
Metal ions
Surface treatment
Carbon nanotubes
Microscopic examination
Fires
Thermodynamic stability
Degradation
Coatings

Keywords

  • Carbon nanotubes
  • Clay
  • Fire retardance
  • Raman microscopy
  • Rheology

ASJC Scopus subject areas

  • Polymers and Plastics

Cite this

Complex activity of clay and CNT particles in flame retarded EVA copolymer. / Marosföi, B. B.; Marosi, G.; Szép, A.; Anna, P.; Keszei, S.; Nagy, B. J.; Martvonova, H.; Sajó, I.

In: Polymers for Advanced Technologies, Vol. 17, No. 4, 04.2006, p. 255-262.

Research output: Contribution to journalArticle

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