Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 74, Issue 2, Pages 569-574Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1023/B:JTAN.0000005195.46390.48
Keywords
kinetics; silicon-PTFE mixtures; TG/DTA; thermal decomposition
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Simultaneous TG/DTA has been used to study the thermal decomposition of binary compositions containing polytetrafluoroethene (PTFE) with silicon (Si), calcium silicide (CaSi2), ferrosilicon (FeSi) or iron ( Fe) powders. In nitrogen and under dynamic heating program the thermal decomposition of Si/PTFE and CaSi2/PTFE is an exothermic process. The other two compositions decompose endothermically. In each case the decomposition reactions show first-order kinetics but only iron does not change considerably the kinetics of PTFE depolymerization. The constants of the decomposition rate at 850 K for silicon containing reducers are about four times higher than those of PTFE and Fe/PTFE.
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