Thermoanalytical investigations on lithium stearate,lithium 12-hydroxystearate and related greases |
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Authors: | M M Barbooti D A Al-Sammerrai |
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Institution: | (1) Petroleum Research Centre, Council for Scientific Research, Jadiriyah, P.O. Box 10039, Baghdad, Iraq |
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Abstract: | TG and DSC techniques proved useful in the study of the thermal properties of lithium stearate, lithium 12-hydroxystearate and related greases. Under an inert atmosphere, the stearates decompose into the oxalate prior to the formation of the carbonate. For the related greases, oil degradation-volatilization shows a discontinuity under ambient conditions, because of oxidation and carboxylic acid formation. The atmosphere and the concentration of the soap affect the chemical kinetics of thermal decomposition of the stearates and the greases.
Zusammenfassung TG- und DSC-Techniken haben sich als nützlich für die Untersuchung der thermischen Eigenschaften von Lithiumstearat, Lithium-12-hydroxystearat und der entsprechenden Schmierfette erwiesen. In inerter Atmosphäre zersetzen sich die Stearate über Oxalate als Zwischenprodukt zu Carbonaten. Under Umgebungsbedingungen verläuft die Ölzersetzung-Verflüchtigung der entsprechenden Schmierfette wegen der Oxydation und der Bildung von Carboxylsäure diskontinuierlich. Atmosphäre und Konzentration der Seife beeinflussen die Kinetik der thermischen Zersetzung der Stearate und der entsprechenden Schmierfette.
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