Study on thermal decomposition of calix[6]arene and calix[8]arene |
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Authors: | K Chennakesavulu M Raviathul Basariya G Bhaskar Raju S Prabhakar |
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Institution: | (1) National Metallurgical Laboratory Madras Centre, CSIR Madras Complex, Taramani, Chennai, 600113, India |
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Abstract: | Thermal decomposition kinetics of calix6]arene (C6) and calix8]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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Keywords: | |
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