Effect of UV ageing on space charge characteristics of epoxy resin and its nanocomposites

Abstract

This paper focuses on the space charge characteristics of epoxy resin and its nano-MgO composites exposed to UV irradiation. Compared with the pure epoxy resin samples, different space charge characteristics of the nanocomposites have been found. With the filler content increased (0.5 wt%~7 wt%), the total amount of charge first decreases, then increases, and then decreases again, then tend to be stable for samples experienced 200h UV ageing. Specimens with 3 wt%~5 wt% nano-MgO accumulate less space charge, while the 1 wt% nanocomposites accumulate the most. In addition, total charge of the composites with 3 wt%~5 wt% nanofiller appears almost stable after 50h UV ageing. Measurements of dielectric loss factor and volume resistivity also show that 3 wt%~5 wt% nano-MgO is benefit for the UV ageing resistance in epoxy-based materials.

Influence of Gamma Irradiation and Water Aging on the Space Charge Characteristics of Epoxy Micro-Nano Composites

“…The exposure of polymeric insulating materials to various stresses during their usage may deteriorate its properties and may lead to its early degradation [ 31 , 32 , 33 , 34 , 35 ]. In radiation environments such as nuclear power plants and space equipment, the application of epoxy insulating materials is increasing rapidly [ 28 , 36 ].…”

Experimental Study of Electric and Dielectric Behavior of PVC Composites

“…The inorganic fillers can absorb or reflect UV light, forming a barrier between the polymer and the light source. Researchers in [12] focused on the space charge characteristics of epoxy resin and its nano-MgO composites. It was found that specimens with 3wt%~5wt% nano-MgO accumulate less space charge, while the 1wt% nanocomposites accumulate the most.…”

Understanding the impact of space charge variations with UV‐ and water‐aged epoxy alumina nanocomposites adopting pulsed electroacoustic techniques

“…This heterocharges formation could be due to radiation causing different internal processes, such as chain scission, crosslinking, gas bubble formation, and formation of new radicals, and also due to the presence of dominant charge carriers. Ning et al [13] have indicated the possibility of formation of molecular structure variation causing charge trap sites. Han et al [14] have clearly indicated that the UV irradiation can break some of the chemical bonds of the epoxy resin, causing ageing and degradation of the resin.…”

“…They have identified that higher wt% of MgO with epoxy resin can reduce the space charge accumulation. In addition, after 50 h of UV irradiation, the space charge enhancement gets stabilised [4].…”