单向碳纤维/环氧树脂预浸料热解特性

Pyrolysis characteristics of unidirectional carbon fiber/epoxy prepreg

通过热重实验研究了单向碳纤维/环氧树脂预浸料的热解性能,利用FESEM测试分析了单向碳纤维/环氧树脂预浸料的热解残留物的形貌特征,得到其热解反应过程的物质参与。研究结果表明,单向碳纤维/环氧树脂预浸料的热解反应在空气中分为三个阶段,其中第一、二阶段是环氧树脂基体的热解,第三个阶段是碳纤维的热解。不同形态的单向碳纤维/环氧树脂预浸料在不同加热速率下的热解规律:随加热速率的增加,每个阶段的初始分解温度、反应最终温度及最大失重速率温度均向高温方向移动,热解温度范围逐渐扩大,质量损失明显增加。在相同的升温速率下,块状的单向碳纤维/环氧树脂预浸料相对于其粉末材料的热解时间较长,每个阶段的热解温度较高。

The pyrolysis performance of the unidirectional carbon fiber/epoxy prepreg was studied by thermogravimetric experiment.The morphology of the pyrolysis residue of the unidirectional carbon fiber/epoxy prepreg was analyzed by FESEM,and the material participation involved in the pyrolysis reaction was obtained.The results show that the pyrolysis of unidirectional carbon fiber/epoxy prepreg is divided into three stages in the air.The first and second stages are the pyrolysis of the epoxy resin matrix.The third stage is the pyrolysis of the carbon fiber.The pyrolysis of the unidirectional carbon fiber/epoxy prepreg at different heating rates is that the initial decomposition temperature,the final temperature of the reaction and the maximum mass loss rate are shifted to the high temperature with the increase of the heating rate.The pyrolysis temperature ranges are enlarged gradually,and the mass loss is larger significantly.At the same heating rate,the lumpy unidirectional carbon fiber/epoxy prepreg has a longer pyrolysis time than its powder material,and the pyrolysis temperature is higher at each stage.