Abstract: The non-isothermal decomposition kinetics of 12-bromodehydroabietate methyl ester(BME) were studied by non-isothermal thermogravimetric analysis at various heating rates of 5, 10, 15 and 20 K/min. The activation energy E and the pre-exponential A were analyzed by Kissinger and Flynn-Wall-Ozawa(FWO) method, respectively. The thermal decomposition mechanism and kinetic parameters were studied by Šatava-Šesták method combined 34 kinds of dynamic functions. The results showed that the thermal decomposition mechanism of BME was controlled by the process of random nuclear formation and the nuclear growing, the reaction order n was 3/4, the integral form of kinetic function belonged to G(α)=[-ln(1-α)] ^3/4, the apparent activation energy E was 85.71 kJ/mol, pre-exponential factor A was 1.12×10⁷ s^-1, and the corresponding thermal decomposition dynamic function was dα/dt=1.12×10⁷exp(-85.71×10³/RT)×4/3(1-α)[-ln(1-α)] ^1/4. The function's correlation coefficient is 0.983 3,standard deviation is 0.05.

Key words: 12-bromodehydroabietate methyl ester, non-isothermal thermogravimetric, apparent activation energy, thermal decomposition mechanism