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Thermal decomposition behaviors of β-cyclodextrin, its inclusion complexes of alkyl amines, and complexed β-cyclodextrin at different heating rates

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Abstract

The present work revealed there was a conceptual difference in the thermal decomposition behaviors between the complexed β-cyclodextrin (CD) in an inclusion system and the β-CD complex of guest. The thermal decomposition behaviors of the solid inclusion complexes of β-CD with ethylenediamine (Eda), diethylenetriamine (Dta) and triethylamine (Tea) were investigated using nonisothermal thermogravimetry (TG) analysis based on weight loss as a function of temperature. In view of TG profiles, a consecutive mechanism describing the formation and thermal decomposition of the three solid supermolecules of β-CD was presented. Heating rate has very different effects on the thermal decomposition behaviors of these complexes. The faster the heating rate is, the higher the melting-decomposition point of the complexed β-CD in an inclusion system is, and on the whole the bigger the rate constant (k) of the thermal decomposition reaction of the complexed β-CD is. The thermal decomposition process of the complexed β-CD for each inclusion system is determined to be simple first-order reaction using Ozawa method. The apparent activation energies (E a) and frequency factors (A) of the thermal decomposition reactions of the complexed β-CD molecules have been also calculated. It is found that when the decomposition reaction of the complexed β-CD encountered a large value of E a, such as that in Dta–β-CD system, an apparent compensation effect of A on E a can provide enough energy to conquer the reaction barrier in prompting the k value of thermal decomposition reaction of the complexed β-CD according to Arrhenius equation.

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Authors and Affiliations

  1. Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China

    Le Xin Song, Chuan Feng Teng, Peng Xu, Hai Ming Wang & Zi Qiang Zhang

  2. Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, 230026, China

    Qing Qing Liu

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  2. Chuan Feng Teng
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Correspondence to Le Xin Song.

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Song, L.X., Teng, C.F., Xu, P. et al. Thermal decomposition behaviors of β-cyclodextrin, its inclusion complexes of alkyl amines, and complexed β-cyclodextrin at different heating rates. J Incl Phenom Macrocycl Chem 60, 223–233 (2008). https://doi.org/10.1007/s10847-007-9369-1

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