中文摘要：

采用动态力学分析法（DMA）对碳纤维/双马树脂预浸料恒温、升温过程中动态力学性能的变化进行了研究,结合DSC、偏光显微镜确定了碳纤维/双马树脂预浸料的软化、熔融、凝胶、玻璃化转变及反应始终点的表征方法,考察了预浸料各转变点随升温速率、温度、频率的变化规律以及预浸料的反应规律。结果表明,DMA能很好地表征碳纤维/双马树脂预浸料加热固化中的多种物理化学转变。由于双马树脂基体在180℃以上的反应机制与在180℃以下的不同,这2个温度范围内碳纤维/双马树脂预浸料恒温固化终点的反应程度、力学转变率随恒温温度的变化规律不同。

英文摘要：

The isothermal and continuous heating cure processes of a carbon fiber （CF）/bismaleimide （BMI） prepreg were investigated by DMA. Based on the change of dynamic mechanical properties, the criteria for determining the softening, melting, gelation, vitrification transitions and cure reaction points of the prepreg were established, which were confirmed by the measurements of micropolariscope and DSC. The effects of temperature, heating rate and frequency on the transition and reaction points were studied. Maximum mechanical conversions and reaction conversions of isothermal cure processes were measured. The results show that DMA can well detect various transitions and reaction points of the CF/BMI prepreg. Due to the difference in cure reaction mechanism, the variations of the ultimate mechanical and reaction conversions with the isothermal temperature are different below and above 180 ℃.