Flame Retardant and Smoke Suppressant of Fe‐Organophilic Montmorillonite in Polyvinyl Chloride Nanocomposites

Abstract

Two kinds of polyvinyl chloride (PVC)/organophilic montmorillonite (OMT) nanocomposites are prepared by a melt intercalation method. This study has been designed to determine if the presence of iron and zinc ions in the structure of montmorillonite (MMT) lattice can affect thermal, flame retardant and smoke suppressant properties. The information about the morphological structure of PVC/OMT nanocomposites was obtained using X-ray diffraction and transmission electron microscopy. The thermal and flame retardant properties of the nanocomposites were characterized by thermogravimetric analysis, limiting oxygen index and smoke density. The nanocomposites based on Fe-OMT exhibit better thermal, flame retardant properties and lower degradation degree than those of pure PVC. The degradation mechanism was studied by pyrolysis, gas chromatography and mass spectrometry (Py-GC-MS).

Thermal stability and flame retardance properties of acrylonitrile-butadiene-styrene/polyvinyl chloride/organophilic Fe-montmorillonite nanocomposites

“…It indicates that the smoke suppressant property of Fe-OMT is superior to that of Na-OMT in ABS/PVC blends, and the D s of ABS/PVC/Fe-OMT nanocomposites is depressed with the increment of content of Fe-OMT. Fe-OMT has a good synergistic effect on the flame retardancy and smoke density of PVC [35], which are in agreement with the TG results. Some similar results are also reported that the transition metals compounds are good synergistic agents in flame-retardancy of ABS and PVC [36,37].…”

Intumescent flame retardation of melamine‐modified montmorillonite on polyamide 6: Enhancement of condense phase and flame retardance

“…However, the intercalation agent is combustible, resulting in negative effect on flame retardance. Besides, metal modified MMT was also used for its synergistic effect on improvement of flame retardance [29, 30].…”

Effects of heterionic montmorillonites on flame resistances of polystyrene nanocomposites and the flame retardant mechanism

“…[32][33][34] FeOMt containing both Fe 3+ and Zn 2+ could increase thermal stability and flame resistance of polyvinyl chloride (PVC) nanocomposites. 35 Both the peak heat release rate (PHRR) and the mass loss rate (MLR) were decreased when FeMt (1 to 5 wt%) was added to high impact PS, because Fe 3+ in FeMt might trap free radical and act as an antioxidant or free radical catching agent not only in the thermal degradation process but in the vulcanization process. 36 However, the comparative studies of different cation montmorillonites were even more rarely done.…”