Effect of different surface treatment agents on the physical chemistry and electrical properties of polyethylene nano-alumina nanocomposites

• Main Authors: Xuhui Duan, Wah Hoon Siew, Martin Given, John Liggat, Jinliang He
• Format: Article
• Language: English
• Published: Wiley 2020-06-01
• Series: High Voltage
• Subjects: nanoparticles; scanning electron microscopy; optical microscopy; alumina; thermally stimulated currents; nanocomposites; permittivity; electric breakdown; electrical resistivity; polyethylene insulation; thermal analysis; melt processing; filled polymers; blending; nanofabrication; surface treatment; fourier transform infrared spectra; filling contents; nanoalumina particles; melting blending method; surface modification properties; coupling agents; dielectric properties; fourier-transform infrared spectroscopy; thermogravimetric analysis; morphological properties; dielectric permittivity; direct current volume resistivity; surface treatment agents; physical chemistry; electrical properties; polyethylene nanoalumina nanocomposites; surface treatment process; filling concentration; silane; titanate; polarised optical microscopy; dc breakdown strength; insulation performance; thermal stimulated current; low-density pe; al(2)o(3)
• Online Access: https://digital-library.theiet.org/content/journals/10.1049/hve.2020.0081

Generally, the electrical properties of nanocomposite are affected by the type, size, filling concentration and surface treatment process of the nanoparticle. In this study, nanocomposites of polyethylene (PE) with varying filling contents of nano-alumina particles were prepared by the melting blending method and three different kinds of coupling agents were applied for surface modification properties of the nanoparticles. Two of them were silane based and the other was titanate based. The effect of different coupling agents on the dielectric properties was studied. Fourier-transform infrared spectroscopy and thermo-gravimetric analysis were used to verify their compositions. Scanning electron microscope and polarised optical microscopy were used for morphology study. Dielectric permittivity, direct current (DC) volume resistivity and DC breakdown strength characterised their improved insulation performance with nano-alumina as filler. Thermal stimulated current results revealed that adding nano-alumina particles into low-density PE could provide more deep traps and increase DC resistivity.