Kinetic Analysis of Thermal Decomposition Processes in Materials

Thermal decomposition—the breakdown of a solid or complex compound under the influence of heat—is central to fields as diverse as energy conversion, materials design and environmental science. Kinetic analysis of such processes seeks to quantify reaction rates, elucidate mechanisms and predict material behaviour under varied temperature programmes. Two broad methodological classes are employed. Model-free, or isoconversional, approaches determine activation energy as a function of conversion without presupposing a mechanism; they are prized for revealing complex, multi-step kinetics. Model-fitting methods, in contrast, test candidate mechanisms against experimental curves to extract activation energies, pre-exponential factors and mechanistic functions. Both strategies frequently rely on thermogravimetric analysis (TGA), which monitors mass changes under programmed heating, and differential scanning calorimetry (DSC), which records heat flow. Recent advances have emphasised the importance of global kinetic parameters—activation energy distributions and rate constants—while acknowledging that single-step assumptions may obscure rate-limiting transitions. Emerging computational tools, including artificial neural networks, are now being explored to complement classical techniques by identifying subtle trends and optimising predictive models. The global significance of this research lies in its applications to biomass pyrolysis for renewable fuels, lifetime prediction of polymers and fire performance of insulation materials, as well as in the design of catalysts and stabilisers that inhibit or control thermal degradation. By interlinking fundamental kinetic parameters with practical performance metrics, such analysis underpins the rational design of next-generation materials and sustainable thermal processes.

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Kinetic Analysis of Thermal Decomposition Processes in Materials publication trend

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Technical terms

Activation energy: The minimum energy barrier that must be overcome for thermal decomposition to proceed.

Pre-exponential factor: A constant in the Arrhenius equation representing the frequency of molecular collisions leading to reaction.

Thermogravimetric analysis (TGA): An experimental technique that records mass change of a sample as a function of temperature or time.

Isoconversional methods: Model-free approaches that calculate activation energy at fixed levels of conversion without assuming a reaction mechanism.

Model-fitting methods: Techniques that compare experimental data with theoretical kinetic models to extract mechanistic parameters.

Reaction mechanism: A mathematical description of the sequence of elementary steps by which reactants transform into products during thermal decomposition.

References

1. A combined analysis of the drying and decomposition kinetics of wood pyrolysis using non-isothermal thermogravimetric methods. Energy Conversion and Management X (2023).
2. Artificial Neural Networks for Pyrolysis, Thermal Analysis, and Thermokinetic Studies: The Status Quo. Molecules (2021).
3. Kissinger Method in Kinetics of Materials: Things to Beware and Be Aware of. Molecules (2020).
4. Advanced Isoconversional Kinetic Analysis for the Elucidation of Complex Reaction Mechanisms: A New Method for the Identification of Rate-Limiting Steps. Molecules (2019).
5. Lifetime Prediction Methods for Degradable Polymeric Materials—A Short Review. Materials (2020).
6. Mechanism and kinetics of thermal degradation of insulating materials developed from cellulose fiber and fire retardants. Journal of Thermal Analysis and Calorimetry (2018).