Lian Ze, Chen Danyang, Li Shengtao
State Grid Shanxi Electric Power Research Institute, Taiyuan 030001, China.
State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China.
Polymers (Basel). 2022 Feb 21;14(4):827. doi: 10.3390/polym14040827.
Despite the extensive research on nanocomposites, a fundamental theory on the interface region is still difficult to achieve. In the present paper, we chose epoxy resin and nano-SiO, nano-SiC, nano-ZnO to prepare three kinds of nanocomposites. The dispersion characteristics at the terahertz range and dielectric permittivity at 1 Hz of epoxy resin-based nanocomposites were investigated. The reduction of the permittivity of nanocomposites at a slight filler concentration was absent at the terahertz range. The measurement results at 1 Hz show that the interaction between nano-SiO, nano-SiC particles and epoxy resin was strong with the modification of the silane coupling agent. However, the modification of nano-ZnO particles was invalid. The Lorentz harmonic oscillator model was employed to fit the dispersion characteristics. The relevance between the damping constant and the dielectric permittivity at low frequency was established, indicating that the increase in the damping coefficient results from the restriction of the molecular chain motion by the interfacial region. The present results in this paper reveal a bright prospect of terahertz time-domain spectroscopy in establishing the theory of nanocomposite dielectric.
尽管对纳米复合材料进行了广泛研究，但关于界面区域的基础理论仍难以实现。在本文中，我们选择环氧树脂与纳米二氧化硅、纳米碳化硅、纳米氧化锌制备了三种纳米复合材料。研究了环氧树脂基纳米复合材料在太赫兹频段的色散特性以及1赫兹下的介电常数。在太赫兹频段，纳米复合材料在低填充剂浓度下介电常数并未降低。1赫兹下的测量结果表明，经硅烷偶联剂改性后，纳米二氧化硅、纳米碳化硅颗粒与环氧树脂之间的相互作用较强。然而，纳米氧化锌颗粒的改性无效。采用洛伦兹谐波振荡器模型拟合色散特性。建立了低频下阻尼常数与介电常数之间的相关性，表明阻尼系数的增加是由于界面区域对分子链运动的限制。本文的研究结果揭示了太赫兹时域光谱在建立纳米复合电介质理论方面的光明前景。
