碳纤维/环氧复合材料的热解特性及动力学研究

利用热重—差热同步分析仪研究随机、单向、织布 3种铺层结构碳纤维/环氧复合材料在不同升温速率下的热解特性。氮气气氛(50 mL/min)，升温速率取 5、10、20、30、40 ℃/min，实验温度范围为 25～800 ℃。研究表明：3 种铺层结构碳纤维/环氧复合材料均只有 1 个热解阶段，热解温度范围及到达失重速率峰值温度几乎相同，但铺层结构对热失重速率峰值及质量剩余率有较大影响。随着升温速率的增加，热解反应各阶段终止温度、最大失重速率温度均向高温方向移动。采用 Kissnger 法对不同铺层结构碳纤维/环氧复合材料的热解动力学进行计算，得到其表观活化能。

Pyrolysis characteristics and kinetics of carbonfiber/epoxy composites

The pyrolysis characteristics of carbon fiber/epoxy composites with random, unidirectional and woven laminates at different heating rates were studied by thermogravimetric - differential thermal synchronization analyzer. The atmosphere was nitrogen atmosphere (50 mL/min). The heating rate was set at 5, 10, 20, 30 and 40 ℃/min. The experimental temperature range was 25~800 ℃.The results show that carbon fiber/epoxy composites with three plyschemes has only one pyrolysis stage, and the pyrolysis temperature range and the peak temperature of weight loss rate are almost the same, but the plyschemeshas a great influence on the peak value of thermal weight loss rate and mass residual rate.With the increase of temperature rise rate, the end temperature and the temperature of maximum weight loss rate of pyrolysis reaction in each stage move towards high temperature.Kissnger method was used to calculate the pyrolysis kinetics of carbon fiber/epoxy composites, and the apparent activation energy was obtained.