Abstract
Thermal decomposition kinetics of calix[6]arene (C6) and calix[8]arene (C8) were studied by Thermogravimetry analysis (TG) and Differential thermal analysis (DTA). TG was done under static air atmosphere with dynamic heating rates of 1.0, 2.5, 5.0, and 10.0 K min−1. Model-free methods such as Friedman and Ozawa–Flynn–Wall were used to evaluate the kinetic parameters such as activation energy (E a) and pre-exponential factors (ln A). Model-fitting method such as linear regression was used for the evaluation of optimum kinetic triplets. The kinetic parameters obtained are comparable with both the model-free and model-fitting methods. Within the tested models, the thermal decomposition of C6 and C8 are best described by a three dimensional Jander’s type diffusion. The antioxidant efficiency of C6 and C8 was tested for the decomposition of polypropylene (PP).
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Acknowledgements
The authors K. Chennakesavulu and M. Raviathul Basariya Senior Research Fellows are grateful to Council of Scientific and Industrial Research (CSIR), New Delhi (India) for financial support. The authors are grateful to SAIF-NMR Facility, Indian Institute of Technology, Madras (India), NMR Centre-Indian Institute of Science, Bangalore (India) for providing the necessary spectral and analytical data.
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Chennakesavulu, K., Raviathul Basariya, M., Bhaskar Raju, G. et al. Study on thermal decomposition of calix[6]arene and calix[8]arene. J Therm Anal Calorim 103, 853–862 (2011). https://doi.org/10.1007/s10973-010-1065-5
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DOI: https://doi.org/10.1007/s10973-010-1065-5