Kinetic Investigation of Thermal Decomposition Reactions of 4'-Demethypodophyllotoxin and Podophyllotoxin

Pu Hong Wen

doi:10.4028/www.scientific.net/AMR.800.517

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 800Kinetic Investigation of Thermal Decomposition...

Kinetic Investigation of Thermal Decomposition Reactions of 4'-Demethypodophyllotoxin and Podophyllotoxin

Abstract:

The thermal behavior and thermal decomposition kinetic parameters of podophyllotoxin (PPT) and 4-demethypodophyllotoxin (DMPPT) in a temperature-programmed mode have been investigated by means of DSC and TG-DTG. The kinetic model functions in differential and integral forms of the thermal decomposition reactions mentioned above for leading stage were established. The kinetic parameters of the apparent activation energy E_a and per-exponential factor A were obtained from analysis of the TG-DTG curves by integral and differential methods. The most probable kinetic model function of both decomposition reactions in differential form was (1-α) ². The values of E_a indicated that the reactivity of PPT was higher than that of DMPPT in the thermal decomposition reaction. The values of the entropy of activation ΔS^≠, enthalpy of activation ΔH^≠ and free energy of activation ΔG^≠ of the reactions were estimated.

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Periodical:

Advanced Materials Research (Volume 800)

Pages:

517-521

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.800.517

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Online since:

September 2013

Authors:

Pu Hong Wen

Keywords:

4’-Demethypodophyllotoxin, Kinetic Parameter, Thermal Decomposition

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