Investigation of thermal decomposition of phosphonic acids

► We compare building and decomposition pathways of two phosphonic acids. ► We examine whether the thermal decomposition is reverse to the formation mechanism. ► Based on the identified volatile products decomposition pathways were derived. ► We conclude that the decomposition processes follow the f...

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Bibliographic Details
Published inJournal of analytical and applied pyrolysis Vol. 96; pp. 43 - 53
Main Authors Hoffmann, T., Friedel, P., Harnisch, C., Häußler, L., Pospiech, D.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.2012
Subjects
ATMP
gas chromatography
HEDP
infrared spectroscopy
mass spectrometry
Phosphonic acid
phosphorous acid
pyrolysis
Thermal decomposition
thermogravimetry
Phosphonic acid
ATMP
HEDP
Thermal decomposition
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Summary:► We compare building and decomposition pathways of two phosphonic acids. ► We examine whether the thermal decomposition is reverse to the formation mechanism. ► Based on the identified volatile products decomposition pathways were derived. ► We conclude that the decomposition processes follow the formation mechanism. The paper compares building and decomposition pathways of two phosphonic acids, amino trimethylene phosphonic acid (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 phosphonic acids 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 thermal decomposition of both phosphonic acids 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 thermal decomposition processes is shown.
Bibliography:http://dx.doi.org/10.1016/j.jaap.2012.03.001
ISSN:0165-2370
1873-250X
DOI:10.1016/j.jaap.2012.03.001