HS40碳纤维/氰酸酯树脂复合材料的湿热行为

Hydrothermal Behavior of HS40 Carbon Fiber/Cyanate Ester Resin Composites

通过对低温固化HS40碳纤维/氰酸酯树脂复合材料进行不同湿热环境处理以及3次循环吸湿-脱湿处理,研究其湿热行为。结果表明:复合材料在70℃水浸以及70℃/95%RH两种环境吸湿31 d饱和吸湿率分别为0.71%和0.11%,说明该低温固化氰酸酯树脂基复合材料有很好的耐湿热性;研究复合材料的循环吸湿-脱湿行为,发现复合材料在70℃水浴锅中第1次水浸10 d的吸湿率为0.69%,尚未达到饱和,而第2、3次水浸10 d后的吸湿率分别提高到0.72%和0.74%;复合材料的层间剪切强度随着循环次数的增加,降低更为明显,经过3次循环吸湿-脱湿之后试样的层间剪切强度较干态试样降低了50.77%,连续吸水60 d的试样层间剪切强度较干态试样降低了58.98%。

The hydrothermal behavior of low curing temperature HS40 carbon fiber/cyanate ester resin composites under different hydrothermal environments as well as under three cycles of moisture absorption and desorption processes and continuous moisture for 60 d were investigated. The results show that the saturated moisture absorption of composites exposed to the environment of 70℃ water bath and 70℃/95% RH for 31d are 0.71% and 0.11% , respectively, which shows a good humidity resistance. The moisture absorption of composites at 70℃ water bath for the first 10d is 0.69%, and the moisture absorption of the second and the third immersion are 0.72% and 0.74%, respectively. Additionally, after three cycles of moisture absorption and desorption, the interlaminar shear strength of all the specimens reduces and the extent of decrease is more obvious as the increase of cyclic times. For the specimens after three cycles of moisture absorption and desorption, the interlaminar shear strength decreases by 50.77% compared with the dry specimens. For the specimens with continuous water absorption for 60d, the interlaminar shear strength decreases by 58.98% compared with the dry specimens.