In the electronics and aerospace industries, epoxy resins are generally regarded as economical and efficient adhesives and have a high status. However, epoxy resins are highly crosslinked polymers and are very brittle adhesives where they are prone to fast crack propagation under dynamic loads. Therefore, it is very necessary to enhance the toughness of epoxy resin adhesives. Nano-rubber has been proved to be an important toughening agent for epoxy resin, which can significantly improve the fracture toughness of epoxy resin. However, increasing the toughness of epoxy resin by adding nanomaterials is often accompanied by decreasing the strength and stiffness of resin. Therefore, in this work, rigid nano-silica particles were added to improve the rigidity and tensile strength reduction caused by the addition of rubber particles. And further increase the toughness of the epoxy resin to obtain an epoxy adhesive with balanced stiffness-toughness. As a result, it can be found that the addition of silica particles can significantly improve the decrease in stiffness caused by the addition of rubber particles. For example, Young’s modulus and tensile strength are increased by 28%, and 23%, respectively, with 4% silica is added based on rubber particles. Through the single lap shear experiment, it is found that the shear strength of the epoxy/RnP/silica composite adhesive has increased, which further proves that the addition of nano-silica particles can increase the stiffness of the epoxy composite. The dynamic mechanical analysis experiment found that after adding nano-silica particles, the storage modulus of epoxy composites increased, which also shows that adding nano-silica particles can improve the stiffness of epoxy composites. Scanning electron microscopy analysis was performed to study the reinforcement mechanism of epoxy/RnP/silica composite materials. The thermal stability of epoxy composites was characterized by Dynamic mechanical analysis and thermogravimetric analysis.

在电子和航空工业中，环氧树脂通常被认为是经济有效的粘合剂，并且具有很高的地位。但是，环氧树脂是高度交联的聚合物，并且是非常脆的粘合剂，在动态载荷下，它们易于快速扩展裂纹。因此，非常有必要提高环氧树脂胶粘剂的韧性。纳米橡胶已被证明是一种重要的环氧树脂增韧剂，可以显着提高环氧树脂的断裂韧性。然而，通过添加纳米材料来增加环氧树脂的韧性通常伴随着降低树脂的强度和刚度。因此，在这项工作中，添加了刚性的纳米二氧化硅颗粒以改善由于添加橡胶颗粒而导致的刚度和抗拉强度的降低。并且进一步提高环氧树脂的韧性，以获得具有平衡的刚度-韧性的环氧粘合剂。结果，发现二氧化硅颗粒的添加可以显着改善由橡胶颗粒的添加引起的刚度的降低。例如，基于橡胶颗粒添加4％的二氧化硅，杨氏模量和拉伸强度分别增加28％和23％。通过单搭接剪切实验，发现环氧/ RnP /二氧化硅复合胶粘剂的剪切强度有所提高，这进一步证明添加纳米二氧化硅颗粒可以提高环氧复合材料的刚度。动态力学分析实验发现，加入纳米二氧化硅颗粒后，环氧复合材料的储能模量增加，这也表明添加纳米二氧化硅颗粒可以提高环氧复合材料的刚度。进行扫描电子显微镜分析以研究环氧/ RnP /二氧化硅复合材料的增强机理。通过动态力学分析和热重分析对环氧复合材料的热稳定性进行了表征。