Journal
MATERIALS
Volume 14, Issue 24, Pages -Publisher
MDPI
DOI: 10.3390/ma14247564
Keywords
nylon-6 tennis string wastes; thermal degradation; thermogravimetric analysis; isoconversional kinetics
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Funding
- Key Project of Philosophy and Social Science Planning of Tianjin in China [TJJX18-009]
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The thermal degradation of nylon-6 tennis string nylon wastes was studied using multiple heating-rate thermogravimetric analyses in different atmospheres. Kinetic analysis methods were used to calculate activation energy and evaluate thermodynamic parameters during the thermal degradation process.
Thermal degradation of nylon-6 tennis string nylon wastes in inert nitrogen and air atmospheres was investigated by means of multiple heating-rate thermogravimetric analyses. The results obtained under the heating rates of 5-20 K/min are compared in terms of degradation feature and specific temperature for two atmospheres. Using nonisothermal data, kinetic analysis was thoroughly conducted using various isoconversional model-free methods, including Starink, Madhusudanan-Krishnan-Ninan, Tang, Coats-Redfern, and Flynn-Wall-Ozawa methods. With these kinetic analysis methods, the activation energy over the entire degradation process was successfully calculated. By means of the model-fitting master-plots method, the first-order chemical reaction model was determined to be the most appropriate mechanism function for describing pyrolysis and oxidative thermal degradation of nylon-6 waste. Using kinetic parameters, satisfactory matching against experimental data resulted using the Coats-Redfern method for both cases. Furthermore, thermodynamic parameters such as changes in entropy, enthalpy, and Gibbs free energy during thermal degradation processes were evaluated.
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