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| Effect of Hyperbranched Polyester Grafting Nanosilica on Dielectric Properties of Epoxy Resin |
| Yang Guoqing1, 2, Li Yang1, 2, Wang Deyi1, 2, Liu Jing2, Li Jiaxin2 |
1. State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China Xi’an University of Technology Xi’an 710048 China;;
2. Institute of Water Resource and Hydroelectric Engineering Xi’an University of Technology Xi’an 710048 China; |
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Abstract To improve the interfacial properties of nanosilica/epoxy resin and the insulating behavior of composite materials, hyperbranched polyester and silane coupling agent were used to modify the surfaces of nanosilica in this study. Nanosilica/epoxy resin composites with different filling ratios were prepared, their dielectric properties under different modification methods were investigated. XPS and FTIR spectra show that the hyperbranched polyester can be grafted to nanosilica surface by 40 min of blending reaction under 100℃. SEM observation suggests that within 10% filling quality ratio, nanosilica particles treated by hyperbranched polyester are not prone to agglomerate in epoxy resin. TSDC measurement indicates that 0.86~1.15 eV deep traps are present in the modified nanocomposites. Moreover, the AC breakdown strength of the epoxy resin composites filled with polyester-treated nanosilica is 19% higher than that of the silane-treated composites at a filling quality ratio of 7%. The dielectric loss factor and relative permittivity of composites are also decreased to 0.58% and 4.38 at 5% filling quality ratio. The results mentioned above show that active carboxyl groups can be implanted to nanosilica surfaces by the hyperbranched polyester treatment. Terminal carboxyl radicals with long chains effectively inhibit the agglomeration of nanosilica and enhance the bonding strength between inorganic particles and epoxy matrix. As a result, trap energy of epoxy resin composites is increased, and the insulating behaviors of the epoxy resin composites are obviously improved.
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Received: 01 March 2018
Published: 21 March 2019
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通信作者:杨国清, 男,1979年生,博士,副教授,研究方向为高电压技术和电力设备在线监测技术.E-mail:163usher@163.com |
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2019, Vol. 34 
