Journal
JOURNAL OF FLUORINE CHEMISTRY
Volume 125, Issue 7, Pages 1081-1086Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jfluchem.2004.01.027
Keywords
hydrofluoroethers; hydrofluoropolyethers; thermal stability
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The thermal stability of representative hydrofluoropolyether (HFPE) and hydrofluoroether (HFE) compounds has been evaluated. The observed stability order appears to be correlated with the nature of the hydrogenated chain ends; in particular, molecules having fully hydrogenated chain ends (-OCH3 and -OC2H5) show a significantly lower stability compared with the -OCF2H terminated compounds. The main degradation products suggest, however, that the same primary reaction is responsible for the decomposition of all the compounds examined; this reaction involves the fragmentation of the RfO-CxHyFz bond with fluorine transfer between the two carbon atoms close to the oxygen, leading to the formation of a hydrofluorocarbon CxHyF(z+1) and an acyl fluoride or a ketone. (C) 2004 Elsevier B.V. All rights reserved.
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