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Distribution of Al2O3 in PE/EVA blends and the thermal conductivity of PE/EVA/Al2O3 composites

This paper aims at dispersing nanoscale Aluminium oxide (Al<sub>2</sub>O<sub>3</sub>) in Polyethylene/Ethylene Vinyl Acetate copolymer blends (PE/EVA) to improve the thermal conductivity of the composites. Blends of PE and EVA were prepared at different PE/EVA ratio, and PE/EVA blends with co-continuous structure were obtained. PE/EVA/Al<sub>2</sub>O<sub>3</sub> composites were prepared by dispersing different amount of Al<sub>2</sub>O<sub>3</sub> into co-continuous PE/EVA blends. Scanning Electron Microscopy (SEM) was used to observe the morphology of PE/EVA/Al<sub>2</sub>O<sub>3</sub> composites treated by selective solution extraction. The thermal conductivities and mechanical properties of PE/EVA/Al<sub>2</sub>O<sub>3</sub> composites were investigated. SEM results indicated that Al<sub>2</sub>O<sub>3</sub> was observed to selectively localize in PE phase. Moreover, the selective distribution of Al<sub>2</sub>O<sub>3</sub> and the co-continuous structure of the composites were helpful in improving the thermal conductivity and mechanical properties, leading to a 20.9% increase of thermal conductivity of PE/EVA/Al<sub>2</sub>O<sub>3</sub> composites in comparison to that of PE/Al<sub>2</sub>O<sub>3</sub> composites.