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- 2019
改性纳米SiO2/硅橡胶复合材料的制备及性能
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Abstract:
为提高纳米SiO2在硅橡胶（SR）基体中的分散性及两相间的界面结合力，设计以羟基硅油（HSO）和γ-甲基丙烯酰氧基丙基三甲氧基硅烷（KH570）为纳米SiO2的表面封端改性剂，并将改性SiO2与双组份加成型液体SR复合得到改性纳米SiO2/SR复合材料。通过一系列表征手段对改性纳米SiO2的形貌结构及其在乙醇中的分散性等进行分析，研究了改性纳米SiO2对纳米SiO2/SR复合材料的断面形貌、力学性能及热稳定性的影响。结果表明：KH570成功接枝到纳米SiO2表面并与SR基体间形成化学键。当HSO协同KH570改性纳米SiO2时，可有效改善纳米SiO2在SR基体中的分散性能及纳米SiO2与SR两相间的界面结合性能，并显著提高纳米SiO2/SR复合材料的力学性能和热稳定性。将SiO2∶HSO∶KH570以质量比为2.0∶0.2∶0.6处理的改性纳米SiO2粒子，得到的改性纳米SiO2/SR复合材料起始热分解温度提高了230℃。当SiO2∶HSO∶KH570质量比为2.0∶0.2∶0.45时，改性纳米SiO2/SR复合材料的拉伸强度和断裂伸长率分别提高了约1倍。 To improve the dispersibility of nano SiO2 particles in silicon rubber (SR) and the interfacial bonding performance of the two phases, the surface modification agent consisting of hydroxyl silicone oil (HSO) and 3-(trimethoxysilyl)propylmethacrylate (KH570) for nano SiO2was designed. And the modified nano SiO2/SR composites were prepared. The morphology structure of nano SiO2 and the dispersibility of nano SiO2in the ethanol were investigated, the fracture surface morphology, mechanical properties and thermal stability of the modified nano SiO2/SR composites were also analyzed. The results show that KH570 is successfully grafted to the surface of nano SiO2 and formes chemical bonds with the SR matrix. When the nano SiO2 is treated by the hybrid surface modification agent (HSO cooperated with KH570), the dispersibility of SiO2 in SR matrix, and the interface bonding performances between SiO2 and SR are improved obviously, the mechanical properties and thermal stability of the SiO2/SR composites are also enhanced significantly. When SiO2:HSO:KH570 mass ratio is 2.0:0.2:0.6, the initial temperature of thermal decomposition of the modified nano SiO2/SR composite increases to 230℃. When SiO2:HSO:KH570 mass ratio is 2.0:0.2:0.45, the tensile strength and elongation at break of the modified nano SiO2/SR composite increase twice, respectively. 国家自然科学基金（51473147
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