Thermal stability and flame resistance of EVA in the presence of nanoclay and an intumescent flame retardant system

Thermal stability behavior and flame resistance of EVA containing a type of organoclay and a free halogen intumescent flame retardant system were studied. In order to investigate state of the organoclay dispersion within the EVA matrix, TEM was performed. Thermal stability and flammability of the samples were probed by TGA and CCT along with LOI tests. The TEM observations revealed that the organoclay had relatively proper dispersion within the EVA polymer matrix. On the base of the results of the TGA and CCT experiments, besides improvement of thermal stability and flame resistance of the EVA with addition of each the flame retardant additives, there was a significant synergism effect between the organoclay and the intumescent flame retardant materials. This effect was explained by the solid phase physical mechanism. Although no marked effect of the organoclay on the LOI of EVA observed, it was significantly increased by the free halogen intumescent flame retardant system.

کلیدواژه ها:

Nanocomposite ، Thermal stability ، flame resistance ، intumescent ، ethylene vinyl acetate