Study on preparation and electrical properties of modified nano magnesia-crosslinked polyethylene composites
To improve the insulation performance of crosslinked polyethylene(PE-XL),MgO-NH2/PE-XL nanocompos-ites were prepared by using polyethylene(PE)as a matrix and modified MgO(MgO-NH2)as a filler.The electrical in-sulation performance of the nanocomposites before and after thermal aging was investigated.The obtained results were compared with the unmodified MgO-crosslinked polyethylene composites(PE-XL/MgO).The insulation properties of the nanocomposites were studied by DC breakdown strength,space charge,and DC conductivity.Compared to the non-aged PE-XL/MgO,the non-aged PE-XL/MgO-NH2 nanocomposites showed an increase in DC breakdown strength by 20%,and the heterogeneous space charge accumulation could be negligible.After thermal aging,the breakdown strength of MgO/PE-XL and PE-XL/MgO-NH2 nanocomposites decreased by 38%and 20%,respectively,compared to those before thermal aging.In addition,the PE-XL/MgO-NH2 nanocomposites obtained from the surface modifica-tion of MgO have a lower DC conductivity than PE-XL/MgO.The PE-XL/MgO-NH2 nanocomposites exhibited better performance under non-aging conditions,and they also showed stronger inhibition to the deterioration caused by thermal aging.
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维普
