Surface reactivity of tributyl thiophosphate: effects of temperature and mechanical stress

The surface reactivity of tributyl thiophosphate on iron surfaces has been studied in situ by attenuated total reflection Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy and temperature-programmed reaction and desorption spectroscopies. The results show that at temperatures...

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Bibliographic Details
Published in:Tribology letters Vol. 23; no. 3; pp. 197 - 208
Main Authors: Rossi, A., Piras, F.M., Kim, D., Gellman, A.J., Spencer, N.D.
Format: Journal Article
Language:English
Published: Dordrecht Springer Nature B.V 01.09.2006
Subjects:
Cleavage
Desorption
Fourier transforms
Infrared reflection
Iron
Photoelectrons
Spectrum analysis
Substrates
Temperature
Temperature effects
Tribology
X ray reflection
ISSN:1023-8883, 1573-2711
Online Access:Get full text
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Summary:The surface reactivity of tributyl thiophosphate on iron surfaces has been studied in situ by attenuated total reflection Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy and temperature-programmed reaction and desorption spectroscopies. The results show that at temperatures lower than 373 K the molecule forms a physisorbed layer on the iron substrate. At 373 K a reaction takes place with the formation of an organic layer, together with iron polyphosphate and sulfate. At higher temperatures temperature-programmed desorption results suggest that the mechanism involves P–O bond scission to yield butoxy groups. This could be preceded by P=S bond scission to give tributyl phosphite, which then, in turn, undergoes P–O bond scission to produce butoxy groups. The results obtained following tribological testing are in agreement with those of thermal tests: evidence of polyphosphate and sulfate formation is found.
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ISSN:1023-8883
1573-2711
DOI:10.1007/s11249-006-9051-6