Thermal Decomposition of GAP Studied by Dynamic Pressure-measuring Thermal Analysis

Abstract

The thermal decomposition process of GAP in a vacuum confined space was measured by Dynamic Pressure-measuring Thermal Analysis(DPTA). In order to avoid the test error, the test process was improved: the method of liquid nitrogen condensation was used to prevent GAP volatilization in the process of vacuum pumping in the reaction test tube, and the vapor pressure at different temperatures was measured by thermogravimetric analysis. The results show that at 80°C to 120°C, the mechanism function of GAP non-isothermal decomposition reaction is Jander equation, the apparent activation energy is 159.8kJ·mol-1, and the pre-exponential factor lnA is 25.8. At the GAP isothermal reaction stage, the mechanism function changes with the temperature. When the temperature increases, the thermal decomposition reaction changes from diffusion reaction to activation reaction. The decomposition rate constant K increases exponentially with increasing temperature. When T=80°C, K=1.27×10-6; when T=120°C, K=36.93×10-6. According to the data of the decomposition time of 0.1% in the temperature range of 80~120 °C, the Semenov equation is lntT = 19039.90/T- 43.012. The storage life is 35.96 years at 25°C.