Temperature-variable Raman spectroscopy equipped with a mapping function was used to investigate the micro-mechanical properties of a carbon fiber (CF)-reinforced polyimide (PI) composite film using carbon nanotubes (3 wt%) dispersed in PI as the stress sensor. The stress distributions in the CFs and the interface region during heating from 25 to 300 °C were mapped based on the stress sensitive Raman G' band (around 2679 cm⁻¹) shifts of the CNTs. Results indicated that thermal motion of PI chains affects the mechanical properties when the CF/CNT-PI film was heated up to 300°C. Both CFs and the interface region were compressively stressed below 200°C, and the stress decreased with increasing temperature and was eliminated at around 200°C. A tensile stress developed above 200 °C which was distributed mainly on the CFs, and increased with temperature. Furthermore, stress transfer between the CFs and the matrix was less than 100% due to the thermal stress hysteresis in the PI matrix.

使用具有映射功能的温度可变拉曼光谱技术，以分散在PI中的碳纳米管（3 wt％）为应力传感器，研究了碳纤维（CF）增强的聚酰亚胺（PI）复合膜的微机械性能。根据应力敏感的拉曼G'带（大约2679 cm ^-1），绘制了从25到300°C加热期间CFs和界面区域中的应力分布图）的变化。结果表明，当CF / CNT-PI薄膜加热到300°C时，PI链的热运动会影响其机械性能。CFs和界面区域在200°C以下均受到压缩应力，应力随温度升高而降低，并在200°C附近消除。在200°C以上时产生的拉应力主要分布在CF上，并随温度升高而增加。此外，由于PI矩阵中的热应力滞后，CF与矩阵之间的应力传递小于100％。