Hej,
I will appreciate if you may share some literature for calculating an activation energy for any material using isothermal heat condution calorimeters.
Dear M. Pushp,
To be the best of my knowledge, the kinetic parameters such as activation energy (Ea) are most examined by non-isothermal thermal analysis of materials. The data typically generated from thermogravimetric analysis of materials under non-isothermal heating programs at multiple heatings rates (e.g. 5, 10, 20 C/min etc).
Subsequently, the model equantions of kinetic analysis are applied to the resulting TG data to deduce the activation energy, frequency factor and reaction order. Hope this helps.
Best regards,
BB Nyakuma
To complete the answer of Bemba (just adding that DSC differential scanning calorimetry is largely mostly used for the purpose), I'd recommend to examine the works of Vyazovkin and Sbirrazzuoli on isoconversional kinetics.
You may have an idea of the corresponding literature in this recommendations.
Sergey Vyazovkin, Alan K. Burnham, José M. Criado, Luis A. Pérez-Maqueda, Crisan Popescu, Nicolas Sbirrazzuoli, ICTAC Kinetics Committee recommendations for performing kinetic computations on thermal analysis data, Thermochimica Acta, Volume 520, Issues 1–2, 2011, Pages 1-19, http://www.sciencedirect.com/science/article/pii/S0040603111002152) Abstract: The present recommendations have been developed by the Kinetics Committee of the International Confederation for Thermal Analysis and Calorimetry (ICTAC). The recommendations offer guidance for reliable evaluation of kinetic parameters (the activation energy, the pre-exponential factor, and the reaction model) from the data obtained by means of thermal analysis methods such as thermogravimetry (TGA), differential scanning calorimetry (DSC), and differential thermal analysis (DTA). The recommendations cover the most common kinetic methods, model-free (isoconversional) as well as model-fitting. The focus is on the problems faced by various kinetic methods and on the ways how these problems can be resolved. Recommendations on making reliable kinetic predictions are also provided. The objective of these recommendations is to help a non-expert with efficiently performing analysis and interpreting its results. Keywords: Crosslinking; Crystallization; Curing; Decomposition; Degradation; Kinetics
We have determined since decades activation energies with isothermal heat flow microcalorimetry. See for example the added file.
it shows a more complex situation. Follow references to get more info.
Follow the International Annual ICT Conferences. (Fraunhofer Institute of Chemical Technology). A lot is published there.
Also recently in 2015, 2016, 2017 published data an curing of polyurethanes.
See attached files, from the 6th Heat Flow calorimetry Symposium in May 2008. Please cite the papers correctly.
More information about the proceedings in the added files.
By the way:
in May 2019 we have the 11th Heat Flow Calorimetry Symposium in Pfinztal, Germany. See the corresponding WEB-page:
www.ict.fraunhofer.de/hfcs2019
11th International Heat Flow Calorimetry Symposium on Energetic Materials Date: May 13-16, 2019
Venue: Fraunhofer ICT, Germany
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