Abstract
This paper reports the effects of four voltage stabilizers, m-aminophenylboric acid, 2-methoxy-5-pyridineboric acid, m-aminobenzoic acid and 4-dimethylaminobenzoic acid, on the insulation properties of polyethylene blends. 1 wt% voltage stabilizers were added into low density polyethylene (LDPE) blend containing 10 wt% high density polyethylene (HDPE) by a solution method. The electrical properties of the blends were analyzed by electrical tree initiation experiments. The results showed that the addition of the voltage stabilizers had great effect on the electric tree initiation When the voltage stabilizers were included into the blends, the tree initiation voltage (TIV) evidently increased, in particular the blend with m-aminobenzoic acid showed the highest increase of 41% than the reference LDPE/HDPE amongst all stabilizers. Several other voltage stabilizers also demonstrate excellent ability to suppress electrical tree initiation. Quantum chemical analysis was used to simulate the HOMO-LUMO energy level of four voltage stabilizers. The results illustrated that m-aminobenzoic acid has the lowest HOMO-LUMO energy level and the best effect of restraining the electrical tree initiation. The experimental results provide guidance for the application of voltage stabilizers in high voltage cables.
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