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Thermal analysis kinetics applied to flame retardant polycarbonate |
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| Authors: | H Polli L A M Pontes M J B Souza V J Fernandes Jr A S Araujo |
| Institution: | 1. Department of Chemical Engineering, UNIFACS
– Salvador University, Salvador, Brazil, BA, 40.220-141, Av. Cardeal da Silva,
132 2. Department of Chemical Engineering, UFS – Federal University of Sergipe, S?o Cristov?o, Brazil, Sergipe, 49.000-00 3. Department of Chemistry, UFRN – Federal University of Rio Grande do Norte, Natal, Brazil, RN, 59078-970, CP 1662 |
| Abstract: | The degradation kinetics of polycarbonate with flame retardant additive was investigated by means of thermogravimetric analysis. The samples were heated from 30 to 900°C in nitrogen atmosphere, with three different heating rates: 5, 10 and 20°C min–1. The Vyazovkin model-free kinetics method was applied to calculate the activation energy (E a) of the degradation process as a function of conversion and temperature. The results indicated that the polycarbonate without flame retardant additive starts to loose mass slightly over 380°C and the polycarbonate with flame retardant additive, slightly over 390°C (with heating rate of 5°C min–1). The activation energy for flame retardant polycarbonate and normal polycarbonate were 190 and 165 kJ mol–1, respectively. |
| Keywords: | flame retardant model-free kinetics polycarbonate thermal degradation thermogravimetry |
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