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Hoffmann, T. ; Friedel, P. ; Harnisch, C. ; Häußler, L. ; Pospiech, D.
Investigation of thermal decomposition in phosphonic acids

The paper compares building and decomposition pathways of two phosphonicacids, amino trimethylene phosphonicacid (ATMP) and 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP).
The theoretical formation reactions were composed using elementary reactions and compared to reaction routes published in literature. As result, summary reaction pathways for both phosphonicacids are proposed which only vary in the number of reaction steps required. These reaction steps include carbonyl reactions, SN2-reactions, and ionic reactions. The synthesis of ATMP proceeds in three reaction steps, whereas HEDP is formed in one reaction. The thermaldecomposition of both phosphonicacids in solid state was examined by combination of thermogravimetry coupled with infrared spectroscopy as well as pyrolysis gas chromatography coupled with mass spectrometry. Decomposition mechanisms were deduced and compared to the theoretical findings resulting in the conclusion that the decomposition processes of ATMP and HEDP follows the formation mechanism.
Thus, the suitability of theoretical considerations for the understanding of thermaldecomposition processes is shown.

Quelle
Journal of Analytical and Applied Pyrolysis 96

Seiten
43-53

DOI
http://dx.doi.org/10.1016/j.jaap.2012.03.001

Erschienen am
March 2012
 
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Publications

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Nanostructured Materials