N,N'-二(5,5-二甲基-2-磷杂-2-硫代-1,3-二噁烷-2-基)乙二胺的热分解动力学研究

以TG-DTG为手段, 研究了N,N'-二(5,5-二甲基-2-磷杂-2-硫代-1,3-二噁烷-2-基)乙二胺(DPTDEDA)在氮气气氛中的热分解动力学, 利用 Kissinger法、Flynn-Wall-Ozawa(FWO)法对DPTDEDA进行了动力学分析, 求出了该物质的热分解动力学参数, 同时利用Satava-Sestak法研究了该物质的热分解机理. 结果表明, Kissinger法所求得的表观活化能为137.37 kJ•mol^－1, 指前因子ln A＝28.00; Flynn-Wall-Ozawa法所求得的活化能为139.83 kJ•mol^－1. DPTDEDA的热分解机理为相边界反应, 其动力学方程为G(α)＝1－(1－α)⁴, 反应级数n＝4.

Study on Thermal Decomposition Kinetics of N,N'-Bis- (5,5-dimethyl-2-phospha-2-thio-1,3-dioxan-2-yl) ethylene diamine

The thermal decomposition kinetics of the N,N'-bis(5,5-dimethyl-2-phospha-2-thio-1,3-di- oxan-2-yl) ethylene diamine (DPTDEDA) in N₂ were studied by TG-DTG techniques. The kinetic parameters, including the activation energy and frequency factor of the decomposition process for the title compound were calculated through the Kissinger and Flynn-Wall-Ozawa(FWO) method and the thermal decomposition mechanism of DPTDEDA was also studied with the Satava-Sestak method. The results show that the activation energy and pre-exponential factor are 137.37 kJ•mol^－1 and 1.45×1012 s^－1 with the Kissinger method and 139.83 kJ•mol^－1 with the Flynn-Wall-Ozawa method respectively. The thermal decomposition mechanism of DPTDEDA is phase boundary reaction and the kinetic equation can be expressed as G(α)＝1－(1－α)⁴, and the reaction order is n＝4.