Study on thermal decomposition kinetics of <italic>N</italic>,<italic>N</italic>’-bis(5,5-dimethyl-2-phospha-2-thio-1,3-dioxan-2-yl)ethylenediamine in air

doi:10.1007/s11458-009-0023-x

Front Chem Chin

2009, Vol. 4

Issue (2) : 136-141 https://doi.org/10.1007/s11458-009-0023-x

RESEARCH ARTICLE

Study on thermal decomposition kinetics of N,N’-bis(5,5-dimethyl-2-phospha-2-thio-1,3-dioxan-2-yl)ethylenediamine in air

Yuanlin REN(

), Bowen CHENG, Jinshu ZHANG, Weimin KANG, Zhenhuan LI, Xupin ZHUANG

School of Textile of Tianjin Polytechnic University; Tianjin Municipal Key Laboratory of Fiber Modification and Functional Fiber, Tianjin Polytechnic University, Tianjin 300160, China

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Abstract

The thermal decomposition kinetics of the N,N￠-bis(5,5-dimethyl-2-phospha-2-thio-1,3-dioxan-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-Ozawsa (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, and 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.

Keywords N N′-bis(5 5-dimethyl-2-phospha-2-thio-1 3-dioxam-2-yl)ethylenediamine thermal decomposition kinetics activation energy mechanism

Corresponding Author(s): REN Yuanlin,Email:yuanlinr@163.com

Issue Date: 05 June 2009

Cite this article:

Yuanlin REN,Bowen CHENG,Jinshu ZHANG, et al. Study on thermal decomposition kinetics of N,N’-bis(5,5-dimethyl-2-phospha-2-thio-1,3-dioxan-2-yl)ethylenediamine in air[J]. Front Chem Chin, 2009, 4(2): 136-141.

URL:

https://academic.hep.com.cn/fcc/EN/10.1007/s11458-009-0023-x
https://academic.hep.com.cn/fcc/EN/Y2009/V4/I2/136

Fig.1 Scheme 1

Fig.2 TG-DTG curves of DPTDEDA at heating rates of 5,10,15,20 K/min in air

Fig.3 TG-DTG curves of DPTDEDA at heating rate of 10 K/min in air

Fig.4 SEM pictures of the char residue of fire retarded viscose
(a) SEM of the surface view of the char residue of fire retarded viscose; (b) SEM of the cross-section view of the char residue of fire retarded viscose

Tab.1 Data of thermal decomposition of DPTDEDA from TG-DTG curves at different heating rates

Tab.2 The apparent activation energy values of DPTDEDA in the two thermogravimetric steps at the different conversions calculated by Friedman and Flynn-Wall-Ozawa methods respectively

Tab.3 The calculated values of kinetic parameters of the DPTDEDA in the first thermogravimetric step by Coats-Redfern method and Achar method respectively

Tab.4 The calculated values of kinetic parameters of the DPTDEDA in the second thermogravimetric step by Coats-Redfern method and Achar method respectively

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