Abstract: Pyrolysis behavior of carbon matrix precursor CH₃ArCH₂NH₂ used for preparing C/Ccomposites by rapid densification process was investigated by closed-pressure-vessel method, DSC, high-pressure DSCmethods and ultraviolet spectrophotometric method. The pyrolysis temperatures and carbon residual ratios of the compound at different temperatures and different pressures were derived and the apparent activation energy was also obtained by isothermal dynamic and non-isothermal dynamic method. The experimental results are as follows: at the atmospheric pressure, the pyrolytic temperature is about 530.15—547.15 K; at the pressure as high as 1—3 MPa, the pyrolytic temperature is about 618.34—675.49 K. The carbon residual ratios in the closed pressure vessel, at the atmospheric pressure and at a high pressure are 56.23%, 28.96%—36.47% and 59.11% respectively. Based on Kissinger's method and the result of isothermal experiment, the apparent activation energies of the pyrolysis reaction under the isothermal and non-isothermal conditions are 206.78 kJ/mol and 183.93 kJ/mol respectively, and the reaction order n≈1.

Key words: C/C composite material, Carbon matrix precursor, Closed-pressure-vessel method, Pyrolysis temperature, Pyrolytic apparent activation energy