Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 146, Issue 3, Pages 437-445Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2014.03.050
Keywords
Amorphous materials; Composite materials; Nanostructures; Polymers; Thermogravimetric analysis (TGA); Thermal properties
Categories
Funding
- Mexican National Council for Science and Technology (Conacyt) [CB-104865]
- Condumex project [PC 0018]
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The synergistic effect of organo-modified montmorillonite (Nanomer I28E and Cloisite 20A) and metal hydroxides (magnesium hydroxide MH and alumina trihydrate ATH) as flame retardants in LDPE/EVA nanocomposites compatibilized with amino alcohol grafted polyethylene (PEgDMAE) was studied. Morphological characterization of nanocomposites was carried out by means of X-ray diffraction (XRD) and scanning transmission electron microscopy (STEM). Flame-retardant properties of nanocomposites were evaluated by the UL-94 horizontal burning and cone calorimeter tests and limiting oxygen index (LOI). Thermal degradation behavior was analyzed with a Fourier transform infrared coupled with the thermogravimetric analyzer (TG-FTIR). The XRD analysis showed a displacement of the d(001) plane characteristic peak of clay to lower angles, which indicates an intercalated exfoliated morphology. From STEM images it was observed a good dispersion of flame retardants (MH and ATH) throughout the polymer matrix which was reflected in flame-retardant properties. TG-FTIR showed a better thermal stability of nanocomposites and the gases evolved during combustion showed an important reduction. Based on thermal stability and thermal degradation results, the flame-retardant mechanism of LDPE/PEgDMAE/EVA/Clay/MH nanocomposites was proposed. (C) 2014 Elsevier B.V. All rights reserved.
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