纳米橡胶增韧环氧树脂的力学性能研究

Study on Mechanical Properties of Nano-rubbers Toughened Epoxy Resin

为了解决环氧树脂的脆性问题,提高其断裂韧性,运用纳米橡胶对环氧树脂进行增韧改性,制备了纳米橡胶增韧的环氧树脂。研究了不同含量的纳米橡胶对环氧树脂的拉伸性能、剪切强度和断裂能的影响规律。结果表明,与纯环氧树脂相比,当纳米橡胶含量为6 phr时,增韧的环氧树脂剪切强度增加16.1%,断裂伸长率提高78.7%,断裂能增大了3.65倍。适量纳米橡胶的添加有利于环氧树脂基体剪切屈服带的产生且进一步诱发银纹,其过程消耗了大量的能量,此乃纳米橡胶增韧环氧树脂的主要机理。

In order to improve the fracture toughness of epoxy resin, the nano-rubbers toughened epoxy resin was prepared by using nano-rubbers. The influence of tensile property, shear strength and fracture energy of the toughened epoxy resin with different nano-rubbers contents was investigated. The results show that when the content of nano-rubbers is 6 phr, the shear strength and elongation at break of nano-rubbers toughened epoxy resin are improved by 16. 1% and 78.1% respectively compared with pure epoxy resin. Also, the fracture energy is increased by 3.65 times. The appropriate addition of nano-rubbers in the epoxy resin is beneficial to the development of shear yield zone which might induce crazing and absorb a lot of energy, which is the main mechanism for improving the fracture toughness of the nano-rubbers toughened epoxy resin.