Understanding the performance of gamma‐ray‐irradiated epoxy nanocomposites

Abstract

Epoxy nanocomposites being used in the high-energy radiation zones as an insulant may undergo changes in their dielectric properties during service. In the present study, the performance of base epoxy resin (S1) is compared with epoxy resin with ion trapping particle (Sample S2) and epoxy resin with nanotitania (Sample S3) particle. The influence of gamma irradiation on nanocomposites was analysed. Corona inception voltage due to water droplet initiated discharge and contact angle reduces post-gamma-ray irradiation. Surface potential decay time constant reduced drastically for gamma-ray-irradiated specimens. Trap distribution characterisation indicated that charge mobility increases after irradiation. The surface roughness of the sample increases with the irradiation dosage. Dielectric relaxation spectroscopy shows that permittivity reduces and loss tangent increases with the gamma-irradiated specimens. Water diffusion rate increases for the gammaray-irradiated specimen. No change in elemental composition, measured using laser-induced breakdown spectroscopy, of test specimens was observed. The hardness of the material and plasma temperature formed during laser shine decreases with gamma-ray irradiation intensity for Sample S1, whereas samples S2 and S3 showed only marginal variation. The performance of Sample S2 is found to be better than Samples S1 and S3.

Analysis of space charge and charge trap characteristics of gamma irradiated silicone rubber nanocomposites

“…The reason for this could be the change in surface energy due to the addition of nano particles [21]. The contact angle decreased for the gamma‐ray irradiated specimens, which could be due to irradiation‐induced chain scission and cross‐linking [16]. However, there was a marginal reduction in the contact angle with alumina content and for gamma‐irradiated samples.…”

“…Sarathi et al [15] studied the performance of corona aged silicone rubber and concluded that the charge retention capability of the insulating material is reduced drastically by degradation of the surface and distinct changes in the functional groups are also observed. Mishra et al [16] studied the impact of gamma irradiation on epoxy nanocomposite and found that charge mobility and hardness of material increases with the irradiation dose. Fu et al [17] analysed the space charge distribution of gamma-irradiated (100 kGy) LDPE samples and found that the intensity of irradiation is proportional to the space charge density in the insulating material.…”

Investigation on space charge and charge trap characteristics of gamma‐irradiated epoxy micro–nano composites

“…In this study, in-situ method is adopted by mixing the epoxy resin, hardener, SiO 2 -fillers, IXE nanoparticles and silane coupling agent together. Standard shear mixing, degassing, casting and curing procedures were followed in the preparation of epoxy micro-nano composite specimens [15]. The epoxy micro-nano composite material is subjected to gamma radiation through a 60 Co radiation source in air ambience with a dosage rate of 660 Gy/h up to total doses of 4 and 8 kGy.…”

Enhanced thermal and dielectric performance of epoxy resin/aluminum nitride nanocomposites at high temperatures

“…[1] As an excellent insulating material, the epoxy resin (EP) shows a highbreakdown strength. [2,3] It is considered as a suitable candidate for the new generation of the packaging material. [4] However, the poor thermal conductivity of the EP has severely restricted the development of the new power electronic devices.…”