Abstract: The pyrolysis characteristics of carbon fiber/epoxy composites with random, unidirectional and woven laminates at different heating rates were studied by thermogravimetric - differential thermal synchronization analyzer. The atmosphere was nitrogen atmosphere (50 mL/min). The heating rate was set at 5, 10, 20, 30 and 40 ℃/min. The experimental temperature range was 25~800 ℃.The results show that carbon fiber/epoxy composites with three plyschemes has only one pyrolysis stage, and the pyrolysis temperature range and the peak temperature of weight loss rate are almost the same, but the plyschemeshas a great influence on the peak value of thermal weight loss rate and mass residual rate.With the increase of temperature rise rate, the end temperature and the temperature of maximum weight loss rate of pyrolysis reaction in each stage move towards high temperature.Kissnger method was used to calculate the pyrolysis kinetics of carbon fiber/epoxy composites, and the apparent activation energy was obtained.

Key words: plyscheme, thermogravimetric - differential thermalanalyzer, pyrolysiskinetics, epoxy resin