Kinetics of oxidative degradation

Applicability of time and temperature superposition

Svajus Asadauskas, Joseph M. Perez, Sevim Z. Erhan

Research output: Contribution to specialist publicationArticle

1 Citation (Scopus)

Abstract

New methodology is suggested to quantify the effect of temperature on oxidative degradation and compare test results obtained at different temperatures or evaluate changes in chemical mechanisms. Assumption of the pseudo-first-order kinetics to calculate activation energies in oxidative polymerization of uninhibited 100 percent oleic triglyceride under thin film oxidation provided only semiquantitative results from available oxypolymerization data at six temperatures from 100° to 175°C. As an alternative approach, Time and Temperature Superposition (TTS) was applied to analyze the data. Several TTS forms consistent with Arrhenius equation showed much greater accuracy in determining activation energies and induction periods. Different stages of oxidative degradation were identified after the data from different temperatures were combined into one kinetic map. Kinetic maps of alkalirefined high oleic sunflower oil, fully formulated synthetic oleate-based hydraulic fluid and additive-free super refined mineral oil showed their increasing resistance to oxypolymerization. Limitations of TTS were discussed.

Original languageEnglish (US)
Volume67
No6
Specialist publicationTribology and Lubrication Technology
StatePublished - Jun 2011

Fingerprint

degradation
Degradation
Kinetics
kinetics
Temperature
temperature
Activation energy
hydraulic fluids
sunflowers
activation energy
Sunflower oil
mineral oils
Mineral Oil
Hydraulic fluids
Mineral oils
Oleic Acid
induction
Triglycerides
polymerization
oils

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Asadauskas, Svajus ; Perez, Joseph M. ; Erhan, Sevim Z. / Kinetics of oxidative degradation : Applicability of time and temperature superposition. In: Tribology and Lubrication Technology. 2011 ; Vol. 67, No. 6.
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Kinetics of oxidative degradation : Applicability of time and temperature superposition. / Asadauskas, Svajus; Perez, Joseph M.; Erhan, Sevim Z.

In: Tribology and Lubrication Technology, Vol. 67, No. 6, 06.2011.

Research output: Contribution to specialist publicationArticle

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