碳纤维／环氧树脂复合材料的热氧老化机理

以碳纤维/环氧树脂复合材料为研究对象，分别采用失重法、静态与动态（DMTA）力学性能测试和IR分析，研究了其热氧老化规律与机理。结果表明：在热氧老化条件下，碳纤维/环氧树脂复合材料的失重率与时间之间的关系服从指数规律；其弯曲强度保留率在25℃热氧老化条件下与老化时间无关，而在100和150℃条件下则随时间呈指数规律衰减，并且温度越高，其弯曲强度保留率下降越快；DMTA与IR分析结果一致，25和100℃的条件下，碳纤维/环氧树脂复合材料的老化形式为物理老化，而在150℃的条件下，则既有物理老化，又有化学老化。

Thermo-oxidative aging mechanisms of carbon fiber/epoxy resin compound materials

Thermo-oxidative aging mechanisms of carbon fiber/epoxy resin compound materials have been studied by measurement of weight losses and static and dynamic mechanical properties as well as IR spectroscopy and SEM. The results showed that the weight loss increased exponentially and the residual bending strength of the composite decreased rapidly with increasing aging time at 100 and 150℃, with the effects being more marked at the higher temperature. There was no change in the composite at 25℃. Dynamic mechanical thermal analysis (DMTA) and IR measurements showed that the thermo oxidative aging of the composite was controlled by physical aging at 25℃ and 100℃, but by both physical aging and chemical aging at 150℃.