紫外老化对碳纤维增强环氧树脂复合材料性能的影响

Influence of artificial accelerating UV aging on carbon fiber reinforced epoxy composite

采用拉挤成型工艺制备碳纤维增强环氧树脂基复合材料,并对其进行人工加速紫外老化实验,对不同老化时间的试样进行弯曲强度测试、冲击强度测试、动态热机械分析(DMA)。结果表明,紫外老化仅影响到受紫外辐射的碳纤维环氧复合材料最外层,使对外层性能敏感的力学性能下降;紫外老化使复合材料玻璃化转变温度(Tg)提高,老化前期提高幅度相对较大,后期变化不明显;随着老化时间的增加,受到紫外辐射的最外层碳纤维/环氧树脂界面受到一定程度削弱。

Carbon fiber reinforced epoxy resin composite was made by pultrusion process, and then artificial accelerating UV aging test was taken. Bending strength test, impact strength test, dynamic mechanical thermal （DMA） analysis were applied to study the Influence of artificial accelerating UV aging on carbon fiber reinforced epoxy composite. The results show that the bending strength and the impact strength of carbon fiber reinforced epoxy composite decayed with UV aging time, especially as an exponential function because of the influence on the outermost layer of the composite ; glass transition temperature （Tg） increased relatively significant at the beginning of UV aging test, and then Tg showed no obvious change; within UV region, UV aging weaken the interface between carbon fiber and epoxy matrixto a certain extent, which gave reason to the decrease of the mechanical properties.