Influence of treated nano-alumina and gas-phase fluorination on the dielectric properties of epoxy resin/alumina nanocomposites
IEEE Transactions on Dielectrics and Electrical Insulation(2020)
摘要
In this study, epoxy resins incorporated with nano-alumina (nano-Al
2
O
3
) are prepared with different concentrations of 0, 1, 3 and 5 wt%. The obtained epoxy resin/Al
2
O
3
nanocomposites are subsequently fluorinated using F
2
/N
2
mixture (F
2
/N
2
20% v/v) at 0.05 MPa and 40°C. The nano-Al
2
O
3
is treated with silane coupling agent γ-aminopropyltriethoxysilane (KH550) to restrict aggregation. The chemical bonding is examined by Fourier-transform infrared spectroscopy. The cross-section and surface morphological analyses are performed using scanning electron microscopy. In addition, the DC surface resistivity is measured using a resistivity test fixture. The variations in electrical properties induced by fluorination are characterized based on dielectric measurements. The experimental results show that chemical bonds are formed between nano-Al
2
O
3
and the coupling agent (KH550). Moreover, the results confirm that fluorination significantly alters the morphology and chemical structure of the sample surface. Gas-phase fluorination produces shallow traps, which consequently reduce the surface resistivity. The treatment of nano-Al
2
O
3
increases the trap energy level to yield higher surface resistivity. Furthermore, the treated Al
2
O
3
nanoparticles show improved distribution and dispersion in epoxy resin, exhibiting good dielectric performance of the nanocomposite.
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关键词
gas-phase fluorination,epoxy resin,nanocomposites,surface treatment
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