From the perspective of improving the thermodynamic properties of epoxy resin, it has become the focus of research to enhance the operational stability of GIS (Gas Insulated Substation) basin insulators for UHV (Ultra-High Voltage) equipment. In this paper, three aminosilane coupling agents with different chain lengths, (3-Aminopropyl)trimethoxysilane (KH550), Aminoethyl)-γ-aminopropyltrimethoxysilane (KH792) and 3-[2-(2-Aminoethylamino)ethylamino]propyl-trimethoxysilane (TAPS), were used to modify nano-SiO₂ and doped into epoxy resin, respectively, using a combination of experimental and molecular dynamics simulations. The experimental results showed that the surface-grafted KH792 model of nano-SiO₂ exhibited the most significant improvement in thermal properties compared with the undoped nanoparticle model. The storage modulus increased by 276 MPa and the Tg increased by 61 K. The simulation results also showed that the mechanical properties of the nano-SiO₂ surface-grafted KH792 model were about 3 times higher than that of the undoped nanoparticle model, the Tg increased by 36.5 K, and the thermal conductivity increased by 24.5%.

中文翻译：

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氨基硅烷偶联剂修饰的纳米SiO2颗粒对环氧树脂复合材料热力学性质的影响

从改善环氧树脂的热力学性质的角度来看，提高用于UHV（超高压）设备的GIS（气体绝缘变电站）面盆绝缘子的操作稳定性已成为研究的重点。本文研究了三种具有不同链长的氨基硅烷偶联剂，（3-氨基丙基）三甲氧基硅烷（KH550），氨基乙基）-γ-氨基丙基三甲氧基硅烷（KH792）和3- [2-（2-氨基乙基氨基）乙基氨基]丙基三甲氧基硅烷（TAPS） ），结合实验和分子动力学模拟，分别用于改性纳米SiO ₂和掺杂到环氧树脂中。实验结果表明，纳米SiO ₂表面接枝KH792模型与未掺杂的纳米颗粒模型相比，热性能显示出最显着的改善。储能模量增加了276 MPa，Tg增加了61K 。仿真结果还表明，纳米SiO ₂表面接枝的KH792模型的力学性能比未掺杂的纳米颗粒模型的Tg高约3倍。增加了36.5 K，导热系数增加了24.5％。