Theory and practice in the thermoanalytical kinetics of complex processes: Application for the isothermal and non-isothermal thermal degradation of HDPE

The criterion according to which the best mechanism of a complex process and the associated kinetic parameters correspond to the best fitting of TG and DTG curves recorded at several heating rates is discussed. The main problem is if the application of such a criterion for a complex process will lea...

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Bibliographic Details
Published in:Thermochimica acta 2010-03, Vol.500 (1), p.30-37
Main Author: Budrugeac, P.
Format: Article
Language:English
Subjects:
Algorithms
Applied sciences
Chemical reactions and properties
Criteria
Degradation
Differential scanning calorimetry
Exact sciences and technology
Fittings
HDPE
Heating rate
Isothermal kinetics
Non-isothermal kinetics
Organic polymers
Physicochemistry of polymers
Polyethylenes
TG and DTG curve fitting method
Thermal degradation
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Summary:The criterion according to which the best mechanism of a complex process and the associated kinetic parameters correspond to the best fitting of TG and DTG curves recorded at several heating rates is discussed. The main problem is if the application of such a criterion for a complex process will lead to the mechanism and corresponding kinetic parameters to be used for predictions. To this end, the thermal degradation of HDPE has been investigated by TG/DTG + DSC simultaneous analysis performed in Ar flow, at five heating rates as well as in four quasi-isothermal conditions. An algorithm for correct determination of the mechanism and the corresponding kinetic parameters of a complex process from non-isothermal and quasi-isothermal data was suggested.
ISSN:0040-6031
1872-762X
DOI:10.1016/j.tca.2009.12.007