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Delocalized aromatic molecules with matched electron‐donating and electron‐withdrawing groups enhancing insulating performance of polyethylene blends
Author(s) -
Wei Zuojun,
Liu Haiyan,
Yu Linwei,
Xiao Shuwen,
Hou Yaxin,
Chen Xiangrong
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49185
Subject(s) - delocalized electron , materials science , polyethylene , space charge , low density polyethylene , conductivity , molecule , polymer chemistry , electrical treeing , polymer , electrical resistivity and conductivity , electron , chemical engineering , composite material , organic chemistry , voltage , chemistry , physics , quantum mechanics , electrical engineering , partial discharge , engineering
Abstract Seven delocalized aromatic molecules with electron‐donating and electron‐withdrawing groups are applied as voltage stabilizers to improve the insulation properties of polyethylene blends. Voltage stabilizers 1 wt% are added into the blends (90 wt% low‐density polyethylene and 10 wt% high density polyethylene) by diffusion loading method. Electrical measurements including electrical treeing, space charge distribution, and direct current conductivity are conducted to disclose their effects. The results show that the co‐existence of matched electron‐donating and electron‐withdrawing groups in the molecules is favorable for the insulation properties. A 50% increase of tree initiation voltage is achieved with the addition of 3‐aminobenzoic acid, which is also able to inhibit the space charge and decrease the conductivity at lower temperature. Besides, the grafting sample of the optimal molecule is successfully prepared and displayed enhanced electrical properties. Finally, the common internal mechanism of the delocalized molecules on different electrical properties is revealed.