碳纤维/环氧树脂预浸料固化过程中的热导率测定

采用调制式差示扫描量热技术(MDSC)实现了碳纤维/环氧预浸料固化过程中的热导率(垂直纤维方向和平行纤维方向)测定。在实验基础上建立了预浸料固化过程中的热导率二元二次函数模型, 确定了热导率随温度及固化度变化的函数关系。结果表明: T800/环氧预浸料沿纤维方向的热导率为1.15~1.40 W/(m·K), 垂直纤维方向热导率为0.85~1.25 W/(m·K)。在相同温度下, 预浸料的热导率值随固化度的增大而减小; 在相同固化度条件下, 预浸料的热导率值随温度的升高而增大。验证结果表明, 拟合所得热导率二元二次函数关系用于预浸料固化过程的数值模拟时, 将提高参数的准确性。

Measurement of thermal conductivity during curing process of carbon fiber/epoxy prepreg

The thermal conductivities of carbon fiber/epoxy prepreg,in the directions of perpendicular and parallel to the fiber direction,were determined during its curing process by modulated differential scanning calorimetry(MDSC).During the carbon fiber/epoxy prepreg curing process the binary quadratic function models of thermal conductivity in different directions were set up based on the experimental results,which was used to determine the value of thermal conductivity with the temperature and the cure degree during the curing process.The results show that the thermal conductivity of the T800/epoxy prepreg is 0.85~1.25 W/(m·K) and 1.15~1.40 W/(m·K) in the directions of perpendicular and parallel to the fiber direction.The thermal conductivity of the prepreg decreases with the degree of cure at the same temperature,and increases with increasing temperature in the same degree of cure.The verification results show that the binary quadratic function model of the thermal conductivity will improve the accuracy of the parameters in numerical simulation.