Structure and Properties of Nanocomposites Prepared by Directly Melt Blending Ethylene-co-Vinylacetate and Natural Montmorillonite

摘要

The poly(ethylene-co-vinylacetate)/montmorillonite (EVA/MMT) nanocomposites were prepared by directly melt blending EVA and natural MMT in the presence of hexadecyl trimethylammonium bromide.The interlayer spacing of the silicate layers in EVA/MMT nanocompos-ites increased within 15 min of the blending time,and then remained unchanged with further increase in the blending time.The tensile and tear strength and Young's modulus of EVA/MMT nanocomposites increased with increasing blending time and reached the maximum value at 15 min,and then decreased.The tensile and tear strength and Young's modulus of EVA/MMT nanocomposites blended at 140 deg C were lower than those of the nanocomposites blended at 120 deg C.The thermal stability of EVA/MMT nanocomposites was improved compared with EVA.Furthermore,the thermal stability of EVA/ MMT nanocomposites in nitrogen was higher than thermal stability of the nanocomposites in air because of the air destabilized the EVA and speeded up both deacylation and degradation.