An Empirical Method For Determination Of Kinetic Models And Kinetic Parameters Associated To Thermo-OxidativeDegradation Of Recycled Polypropylene (PP)
Journal Title: International Journal of engineering Research and Applications - Year 2018, Vol 8, Issue 9
Abstract
The kinetics of thermo-oxidative degradation of polypropylene recycled (PP rec.) was investigated using thermogravimetric (TG) analysis in air atmosphere. An empirical methodology was developed, and it is the result of isoconversional methods (Kissinger-Akahira-Sunose and Ozawa-Flynn-Wall methods) combined with Coats-Redfern method, one-sample t test and IKP method. It was observed that the kinetic mechanism of the PP rec. degradation is dependent of the heating rate used. In lower heating rates, the diffusion mechanism is ruling, and Di-type equations can be used. Otherwise, in higher heating ratesthe reaction rate is proportional to concentration of fraction remaining of reactant(s) raised to a power and Fi-type equations becomes as important as Di-type equations. PP rec. sample was also submitted to eight extrusion cycles prior to TG analysis (PP rec. / 8), and it was noted that the mechanochemical degradation combined with thermo-oxidation produced an expressive reduction in the activation energy values. In addition, there was also a simplification of kinetic mechanism with only Fi-type equations being adequate for description of the process.
Authors and Affiliations
Helson M. da Costa, Valéria D. Ramos, Leonardo L. Esteves, Mônica C. de Andrade
Keywords
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