纳米SiO_2改性环氧树脂复合材料的热稳定性及使用寿命

利用纳米SiO_2接枝改性环氧树脂,探索改性涂层的热降解过程与动力学模型之间的关系,以便观察其结构及了解其工作温度。利用KH550改性纳米填料,测试不同含量的纳米填料对环氧树脂热稳定性的影响。采用TGA和DTA分析纳米SiO_2改性环氧树脂复合材料热降解过程中的热特征温度,从而确定动力学参数和模型拟合方法。所获得的动力学参数被用来在整个降解过程建模。结果表明:得到的动力学三联体用于构建纳米SiO_2改性环氧树脂基复合材料的降解模型,展示了温度对降解时间以及降解速率的影响程度。得出了环氧树脂的使用寿命及其复合材料工作温度的变化范围。

Thermal stability and service life of nano-SiO2 modified epoxy composites

The relationship between the thermal degradation process and the kinetic model of the modified coating was studied by using the grafted epoxy resin modified by nano-SiO2 dioxide.In order to observe its structure and un-derstand its working temperature,the effect of nano-filler with different contents on the thermal stability of epoxy resin was tested by using KH550 modified nano-filler.The thermal characteristic temperature during thermal degra-dation was analyzed by TGA and DTA,and the kinetic parameters and the model fitting methods were determined. The obtained kinetic parameters were used to model the degradation process.The results show that the obtained ki-netic triad is used in the degradation model of nano-SiO2/EP composites.It shows how much temperature affects the degradation time and degradation rate.The life span of the epoxy resin and the working temperature range of the nano-SiO2/EP composite are found.