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Thermal degradation of hydroxypropyl trimethyl ammonium chloride chitosan-Cd complexes

文献类型： 外文期刊

作者： Li, Si-Dong 1 ; Li, Pu-Wang 2 ; Yang, Zi-Ming 2 ; Dong, Jing-Jing 3 ; Yang, Xi-Hong 1 ; Yang, Lei 1 ;

作者机构： 1.Guangdong Ocean Univ, Coll Sci, Zhanjiang 524088, Peoples R China

2.Chinese Acad Trop Agr Sci, Agr Prod Proc Res Inst, Zhanjiang 524001, Peoples R China

3.Changzhi Univ, Dept Biosci & Biotechnol, Changzhi 046011, Peoples R China

关键词： Chitosan;Hydroxypropyl trimethyl ammonium chloride chitosan-Cd complexes;Thermal degradation;Thermal degradation kinetics

期刊名称：JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY （ 影响因子：4.626； 五年影响因子：3.458 ）

ISSN：

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收录情况： SCI

摘要： Thermal degradation of hydroxypropyl trimethyl ammonium chloride chitosan-Cd complexes (HTCC-Cd) was investigated by thermogravimetric analysis. The results indicate that the degradation of HTCC-Cd in nitrogen atmosphere was two-step reaction. For the first step of degradation, the initial temperature of mass loss (T_0), the final temperature of mass loss (T_f), and the temperature of maximum mass loss (T_p) increase linearly with the rising of heating rate (B). To = 1.241B + 220.3, T_p = 1.111B + 245.8, and T_f = 1.335B + 358.2. Using different methods, the kinetic parameters of the two steps were investigated. The results show that the activation energies of the first step of degradation obtained using Friedman and Flynn-Wall-Ozawa methods are 1.684 9 105 and 1.646 9 10~5 J mol~(-1), and the corresponding activation energies for the second step are 1.165 9 10~5 J mol~(-1) and 1.373 9 10~5 kJ mol~(-1). The results obtained from Phadnis- Deshpande methods indicate that the two degradation processes are both nucleation and growth process, and follow A_4 mechanism with intergral form g(X) = [-ln(1-X)]~4.

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