Effects of Benzene Ring and Polar Group on the Conductivity Characteristics of Polyethylene Matrix Composites

摘要

In this paper, four kinds of organic additives, methoxypolyethylene glycol, trans, trans dibenzylidene acetone, 2-tert-butylanthraquinone, 4-allyloxy2-hydroxy-benzophenone, were blended with low density polyethylene (LDPE) to prepare composite materials. The filling volume of LDPE was 0,0.5,1,1.5wt%, respectively. The structure of the samples was characterized by Nicolet-IS5 infrared spectrometer. The dielectric spectrum of the composites at room temperature was measured by NovoControlConcept-80. The DC conductivity of the composites was measured at room temperature using a picoammeter and a three-electrode test system. Four organic additives were successfully blended with LDPE to introduce the corresponding groups. Except methoxypolyethyleneglycol, the effect of other organic additives on the relative dielectric constant is not obvious. The DC conductivity of the sample containing only polar groups increases with the increase of the filling amount, while the DC conductivity of the sample containing polar groups and benzene rings increases or decreases with the increase of the filling amount. The experimental results show that the addition of benzene ring is beneficial to reduce the DC conductivity, and the addition of polar groups is beneficial to increase the DC conductivity.