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化学学报
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化学学报 ›› 2008, Vol. 66 ›› Issue (9): 1123-1128. 上一篇    下一篇

研究简报

N,N′-二(5,5-二甲基-2-磷杂-2-硫代-1,3-二噁烷-2-基)乙二胺在空气中的热分解动力学研究

任元林*,1,2，程博闻2，张金树2，康卫民1,2，李振环2，庄旭品1,2   

  1. (1天津工业大学纺织学院 天津 300160)
    (2天津工业大学天津市纤维改性及功能纤维重点实验室 天津 300160)
  • 投稿日期:2007-09-18 修回日期:2007-12-04 发布日期:2008-05-14
  • 通讯作者: 任元林

Study on Thermal Decomposition Kinetics of N,N′-Bis(5,5-dimethyl- 2-phospha-2-thio-1,3-dioxan-2-yl)ethylenediamine in Air

REN Yuan-Lin*12 CHENG Bo-Wen2 ZHANG Jin-Shu2 KANG Wei-Min12 LI Zhen-Huan2 ZHUANG Xu-Pin12   

  1. (1 School of Textile of Tianjin Polytechnic University, Tianjin Polytechnic University, Tianjin 300160)
    (2 Tianjin Municipal Key Laboratory of Fiber Modification and Functional Fiber, Tianjin Polytechnic University, Tianjin 300160)
  • Received:2007-09-18 Revised:2007-12-04 Published:2008-05-14
  • Contact: REN Yuan-Lin

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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)在空气中的热分解动力学，利用Friedman法、Flynn-Wall-Ozawa(FWO)法对DPTDEDA进行了动力学分析, 求出了该物质两个主要的热分解阶段的热分解动力学参数, 同时利用Coats-Redfern法、Achar法研究了该物质的热分解机理. 结果表明, 用Friedman法所求得的两个热分解阶段的表观活化能的平均值分别为128.03和92.59 kJ•mol－1; 而Flynn-Wall-Ozawa法所求得的两个热分解阶段的表观活化能的平均值分别为138.75和106.78 kJ•mol－1. 由Coats-Redfern法、Achar法得出DPTDEDA在空气中的热分解过程虽主要分为两段反应, 但经过推理其反应机理函数却是相同的, 为f(α)＝3/2(1－α)4/3[(1－α)－1/3－1]－1.

关键词: N,N'-二(5,5-二甲基-2-磷杂-2-硫代-1,3-二噁烷-2-基)乙二胺, 热分解动力学, 活化能, 机理

The thermal decomposition kinetics of the N,N′-bis(5,5-dimethyl-2-phospha-2-thio-1,3-di- oxan-2-yl)ethylenediamine (DPTDEDA) in air were studied by TG-DTG techniques. The kinetic parameters of the decomposition process for the title compound in the two main thermal decomposition steps were calculated through the Friedman and Flynn-Wall-Ozawa (FWO) methods and the thermal decomposition mechanism of DPTDEDA was also studied with the Coats-Redfern and Achar methods. The results show that the activation energies for the two main thermal decomposition steps are 128.03 and 92.59 kJ•mol－1 with the Friedman method, 138.75 and 106.78 kJ•mol－1 with the FWO method respectively. Although there are two main thermal decomposition steps for DPTDEDA in air, the thermal decomposition mechanism of DPTDEDA in the two steps are the same, i.e. f(α)=3/2(1－α)4/3[(1－α)－1/3－1]－1.

Key words: N,N′-bis(5,5-dimethyl-2-phospha-2-thio-1,3-dioxan-2-yl)ethylenediamine, thermal decomposition kinetics, activation energy, mechanism