PTFE-Al sub(2)O sub(3) reactive interaction at high heating rates

Differential scanning calorimetry and a high-speed temperature scanner were used to characterize dynamic features of the reaction between polytetrafluoroethylene (PTFE) and Al sub(2)O sub(3) under heating rates ranging between 20 and 780 degree C min super(-1). Exothermic reaction behavior between P...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2015-01, Vol.119 (1), p.245-251
Main Authors: Hobosyan, MA, Kirakosyan, KhG, Kharatyan, S L, Martirosyan, K S
Format: Article
Language:English
Subjects:
Adiabatic flow
Aluminum
Aluminum oxide
Calorimetry
Decomposition
Exothermic reactions
Heating rate
Polytetrafluoroethylenes
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Summary:Differential scanning calorimetry and a high-speed temperature scanner were used to characterize dynamic features of the reaction between polytetrafluoroethylene (PTFE) and Al sub(2)O sub(3) under heating rates ranging between 20 and 780 degree C min super(-1). Exothermic reaction behavior between PTFE and Al sub(2)O sub(3) was observed at heating rates of 150 degree C min super(-1) and higher. Thermodynamic calculations predicted an adiabatic temperature of 1,425 K for the PTFE/Al sub(2)O sub(3) stoichiometric ratio. At lower heating rates, endothermic decomposition of PTFE dominated the interaction, where PTFE decomposes into gaseous products that escape the system without interacting with alumina. The enthalpy of the PTFE-Al sub(2)O sub(3) exothermic reaction was estimated to be -103 kJ mol super(-1) with activation energy of 21 kJ mol super(-1). This study shows that, for energetic formulation of Al-PTFE, the Al sub(2)O sub(3) layer on the aluminum particles can exothermically react with PTFE, producing AlF sub(3) and carbon monoxide.
ISSN:1388-6150
1572-8943
DOI:10.1007/s10973-014-4080-0