在热固性复合材料废弃物难以高值回收处理的背景下，热塑性复合材料有替代热固性复合材料的趋势，探究热塑性复合材料的热降解机理，有利于指导热塑性复材在不同工况下的使用以及后续的回收降解。利用热失重分析仪在氮气气氛下对比研究聚丙烯酸热塑性树脂（RE）和热塑性树脂玻纤复合材料（RE-FRP）在不同升温速率下的热降解行为。结果表明：RE-FRP复合材料在热降解速率达到最大时的温度比RE纯热塑性树脂高。采用Kissinger法测定的RE体系热降解活化能为196.76 kJ/mol，小于RE-FRP体系的热降解活化能232.91 kJ/mol。采用Flynn-Wall-Ozawa法计算活化能，RE纯树脂体系发生降解反应的表观活化能随降解度变化波动较小，降解反应机理较简单，而RE-FRP体系的表观活化能随着降解度的增加而增加，降解反应存在更复杂的机理。研究表明，与玻璃纤维复合提高了RE-FRP热塑性树脂的热稳定性。

In the context of the difficulty of high-value recycling and treatment of thermoset composite waste, thermoplastic composites have a tendency to replace thermosetting composites, and exploring the thermal degradation mechanism of thermoplastic composites is conducive to guiding the use of thermoplastic composites under different working conditions and the subsequent recycling and degradation. The thermal degradation behavior of polyacrylic acid thermoplastic resin (RE) and thermoplastic resin glass fiber composites (RE-FRP) under different heating rates was compared and studied by a thermogravimetric analyzer under nitrogen atmosphere. The results show that the temperature of RE-FRP composites is higher than that of RE pure thermoplastic resin when the thermal degradation rate reaches the maximum. The activation energy of thermal degradation of the RE system measured by the Kissinger method was 196.76 kJ/mol, which was 232.91 kJ/mol less than that of the RE-FRP system. The Flynn-Wall-Ozawa method was used to calculate the activation energy, the apparent activation energy of the degradation reaction of the RE pure resin system fluctuated little with the change of degradation degree, the degradation reaction mechanism was simple, while the apparent activation energy of the RE-FRP system increased with the increase of degradation degree, and the degradation reaction had a more complex mechanism. The study shows that the thermal stability of RE-FRP thermoplastic resin is improved by combining with glass fiber.