改性双马树脂/碳纤维复合材料体系耐湿热性能研究

对5428/T700复合材料的吸湿率、不同吸湿条件下的玻璃化转变温度及高温湿态力学性能进行了研究。结果表明,5428/T700体系具有较低的吸湿率,经70℃去离子水水煮72 h,吸湿率为0.5%,饱和吸湿率(水煮360 h)为0.8%。而且随着复合材料吸湿量的增加,其Tg下降缓慢;5428/T700复合材料在干态170℃下的弯曲性能和层间剪切性能保持率在70%以上,在湿态150℃下的弯曲性能和层间剪切性能保持率在50%以上;5428/T700复合材料在湿态150℃下的开孔压缩强度保持率在80%以上。

Study on the hydrothermal properties of a modified bismaleimide resin/carbon fiber composite

5428 resin was a high-toughness modified bismaleimide resin,which was developed in recent years.When it combined with the carbon fiber T700,the composite could meet the needs of high-properties and low-cost in the aeronautical field.Because the aeronautical materials were usually used in the hydrothermal conditions,it was necessary to conduct an investigation into the hydrothermal properties of the materials.In this paper,the hydrothermal properties of 5428/T700 composite was described,such as the moisture-absorption rate,the Tg under the condition of different moisture-absorption,and the mechanics performance under the hydrothermal conditions of 5428/T700 composite.The results meant that the 5428/T700 composite had low wet-absorption rate,that was 0.5% at infusing 72 h in deionized water at 70 ℃ and the saturated wet-absorption rate(infusing 360 h in deionized water at 70 ℃) was 0.8%,but the glass state temperature was slowly decreased with wet-absorption increased and the retention ratio of its mechanical properties such as flexural property and interlaminar shear strength in the condition at 170 ℃ and dry state was more than 70 % but its retention ratio in the condition at 150 ℃ and wet state was also more than 50 % meantime the retention ratio of the open-hole compression strength was more than 80%.Therefore,the 5428/T700 composite had good hydrothermal-resistance ability.