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Investigation of the thermal decomposition of selected N,N-dialkylamides at low temperature

Abstract : For the reprocessing of nuclear fuel, the thermal stability of extradants such as N,N-di-(2-ethylhexyl)-3,3-dimethylbutanamide (DEHDMBA) has to be known. The complexity of the reactions involved leads us to consider the thermal degradation of two N,N-dialkylamides which are similar in structure to DEHDMBA. These two models N,N-dialkylamides and DEHDMBA heated to 215 °C essentially produce acids, ketones, imides, and amides. The atmospheric oxygen level is the most influential factor on amide thermolysis. A thermal oxidation mechanism is therefore probably involved. It is shown that the two N,N-dialkylamides with long carbon chains, exhibit similar thermal behaviour. Moreover, most of the degradation products appear whatever the atmosphere and the temperature applied. Acids are often final reaction products, as are some primary amides and aldehydes. Secondary amides, sometimes partially degraded, are also identified after 2 or 3 h reaction time. Imides are generally intermediate reaction products. This separation between final products and by-products allows a schematic reaction pathway for N,N-dialkylamide thermal degradation at 215 °C to be established.
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Thierry Dagnac, Jean-Michel Guillot, Pierre Le Cloirec. Investigation of the thermal decomposition of selected N,N-dialkylamides at low temperature. Journal of Analytical and Applied Pyrolysis, Elsevier, 1997, 42 (1), pp.53-71. ⟨10.1016/S0165-2370(96)00972-2⟩. ⟨hal-03520007⟩



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