Improving the Dispersity and DC Breakdown of MgO/LDPE Nanocomposite by Adding EVA

Abstract

To improve the agglomerate phenomena of polarity nanosized MgO-filler in non-polar low density polyethylene (LDPE) matrix, in the composite (MgO/LDPE) master batch preparation process, adding a certain amount of ethylene-vinyl acetate copolymer (EVA), in order to improve the compatibility of nanoparticles and matrix materials. The dispersion states of MgO in the MgO/LDPE and EVA/MgO/LDPE composite material was evaluated by using scanning electron microscope (SEM), results shown that compared with MgO/LDPE nanocomposite, the dispersion of EVA modified MgO/LDPE is better and the agglomerate phenomena is not seen. DC breakdown tests shown that EVA modified MgO/LDPE compared with other several kinds of materials (LDPE; EVA/LDPE; MgO/LDPE and EVA/MgO/LDPE); the DC breakdown strength has improved significantly.

Experimental study of the rheological, mechanical, and dielectric properties of MgO/LDPE nanocomposites

“…It was well documented that the introduction of nm‐sized MgO particles can hinder the accumulation of space charge in the insulation, widely used in the high voltage DC cable . However, the effects of MgO‐NPs itself as well as its distribution state and concentration on the flow properties and the mechanical performance of LDPE matrix still lack a further insight …”