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Thermal decomposition behaviour of diglycolamide – Nitric acid system

Authors
  • Chandran, K.
  • Venkatesan, K.A.
  • Anthonysamy, S.
  • Srinivasan, T.G.1
  • 1 Chemistry Group, Indira Gandhi Centre for Atomic Research
Type
Published Article
Journal
Thermochimica Acta
Publisher
Elsevier
Publication Date
Jan 01, 2014
Accepted Date
Mar 15, 2014
Identifiers
DOI: 10 1007/s10973-013-3504-6
Source
Elsevier
Keywords
License
Unknown

Abstract

The thermal decomposition behaviour of N,N,N′,N′-tetraoctyldiglycolamide (TODGA) and N,N,N′,N′-tetraethylhexyldiglycolamide (TEHDGA) and their solutions with n-dodecane, dihexyloctanamide and isodecanol was studied in the presence and absence of HNO3. Experiments were conducted in air ambience with closed vessel using an adiabatic calorimeter. While neat TODGA and TEHDGA were thermally stable up to ∼600K, they decomposed in the presence of HNO3 at ∼400K. The presence of n-dodecane enhanced the onset of decomposition by 20–40K, while the dihexyloctanamide and isodecanol lowered the onsets by about 20K. From the results the rise in true adiabatic temperature (ΔTad) and the pressure (ΔP) as well as thermokinetic parameters such as, the enthalpy change, the activation energy and the pre exponential factor for the decomposition reaction were derived. The ΔTad and ΔP were seen to increase exponentially with increasing HNO3 content.

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