Effect of Clay Network Formation on Flame Retardancy of Polyethylene terephthalate/montmorillonite Nanocomposites

Document Type: Research Paper


Faculty of Engineering, Textile Department, Islamic Azad University Yadegar-e- Imam Khomeini (RAH), Shahr-e-Rey Branch, Tehran, Iran


Considering the importance of determining potential hazards and factors that can cause an
unexpected fire and due to the important role of nanotechnology to achieve more effective
properties, this paper presents our experiments on preparing nanocomposites based on
Poly(ethylene terephthalate)(PET) and montmorillonite (MMT) as organoclay via melt
blending with different clay loadings to investigate their combustion behavior. The main
objective of this work was employing cone calorimeter as a perfect device to investigate all
combustion parameters such as time to ignition (TTI), heat release rate (HRR), mass loss
rate(MLR), CO and CO2 release and peak of heat release rate (pHRR). Thermogravimetric
analysis (TGA), Cone calorimeter, limiting oxygen index (LOI) were employed to measure
thermal stability and flammability of nanocomposite samples. Morphology and rheology of
clay /PET nanocomposites also were investigated using X-ray diffraction (XRD) and
Transmission electron microscopy (TEM).The relationship between decrease of intrinsic
viscosity and thermal behavior of sample also was studied. Results indicate that clay network
was formed in nanocomposites samples which strongly affected flammability of burning
samples and resulted more residue during combustion which leads to decrease in dripping of
PET during melting.