Abstract
The effects of nano-silica with different surface treatment on thermal stability, flame retardant properties and mechanical properties of ethylene-vinyl acetate copolymer (EVA) /alumina trihydrate (ATH) composites are discussed by thermal gravimetric analysis (TG), limited oxygen index (LOI) and tensile properties. The results of TG show better thermal stability of composites with nano-silica. The maximal weight loss rate is obviously decreased with the addition of nano-silica. Furthermore, the composites with surface treated nano-silica possess better thermal stability and lower weight loss rate. More residues left at 600°C reveal that surface treated nano-silica can promote the charring of the composites. Thus, improved flame retardant properties of composites with surface treated nano-silica can be discovered as a result of much higher LOI value. Meanwhile, such composites also show improved tensile properties than EVA/ATH at the same loading levels of fillers.
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