Abstract: The different directions of thermal response behavior of unidirectional carbon fiber/epoxy resin prepreg under different high temperature environment were experimentally investigated. The results showed that the thermal response temperature and thermal conductivity of unidirectional carbon fiber/epoxy resin prepreg increased with the increase of thermal response time and then tended to be stable at a temperature lower than 230 ℃. In high temperature environment above 230 ℃, the thermal response temperature peaks, the material is gradually damaged, and the thermal response behavior is complex. In addition, the thermal conductivity of unidirectional carbon fiber/epoxy resin prepreg in the direction of plane and thickness was obtained, and the thermal conductivity in the direction of plane was always greater than that in the direction of thickness.

Key words: unidirectional carbon fiber/epoxy resin prepreg, thermal response behavior, high temperature environment