Loredana Pop - Academia.edu (original) (raw)
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National University of Ireland, Maynooth
University of Natural Resources and Life Sciences, Vienna (BOKU)
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Papers by Loredana Pop
Journal of the American Oil Chemists' Society, 2007
Environmentally friendly vegetable oils and their derivatives represent alternatives to mineral-b... more Environmentally friendly vegetable oils and their derivatives represent alternatives to mineral-based lubricants. Vegetable oils have high biodegradability and low production costs. Their poor thermo-oxidative stability and poor low temperature properties are disadvantages in their use as lubricant basestocks. In our study we used corn oil and diester mixtures, which become lubricants when additives are introduced. These mixtures of corn oil and di-2-ethylhexyl-adipate (DOA) and di-2-ethylhexyl-sebacate (DOS) offer a wide range of kinematic viscosities, pour points lower than-39°C and flash points over 218°C. The diameters of wear scars measured under four-ball testing (40 daN) are less than 0.90 mm and the copper strip corrosion test result is 1a. The differential scanning calorimetry study and thermogravimetric study under nitrogen atmosphere and in synthetic air are reported. From these studies a higher thermal stability was observed for corn oil than for diester oils. The thermo-oxidative instability occurred at temperatures higher than 350°C. The low production cost of corn oil and its mixtures with diesters makes them an attractive alternative to mineral oil lubricants.
Lubricants Derived from Castor Oil and Synthetic Diesters Mixtures
SUMMARY We present in this paper our results concerning the mixtures of castor oil and diesters (... more SUMMARY We present in this paper our results concerning the mixtures of castor oil and diesters (di-2-ethilhexiladipate and di-2-ethilhexilsebacate) as basestocks for lubricants. The obtained oils present intermediate characteristics between those of castor oil and of diesters, but higher to those of mineral oils of the same viscosities. The paper contains the physical-chemical and rheological properties, as well as a thermogravimetrical study of the considered oils.
Journal of the American Oil Chemists' Society, 2008
Environmentally friendly vegetable oils and their derivatives represent alternatives to mineral-b... more Environmentally friendly vegetable oils and their derivatives represent alternatives to mineral-based lubricants. Vegetable oils have high biodegradability and low production costs. Their poor thermo-oxidative stability and poor low temperature properties are disadvantages in their use as lubricant basestocks. In our study we used corn oil and diester mixtures, which become lubricants when additives are introduced. These mixtures of corn oil and di-2-ethylhexyl-adipate (DOA) and di-2-ethylhexyl-sebacate (DOS) offer a wide range of kinematic viscosities, pour points lower than -39°C and flash points over 218°C. The diameters of wear scars measured under four-ball testing (40 daN) are less than 0.90 mm and the copper strip corrosion test result is 1a. The differential scanning calorimetry study and thermogravimetric study under nitrogen atmosphere and in synthetic air are reported. From these studies a higher thermal stability was observed for corn oil than for diester oils. The thermo-oxidative instability occurred at temperatures higher than 350°C. The low production cost of corn oil and its mixtures with diesters makes them an attractive alternative to mineral oil lubricants.
Journal of the American Oil Chemists' Society, 2007
Environmentally friendly vegetable oils and their derivatives represent alternatives to mineral-b... more Environmentally friendly vegetable oils and their derivatives represent alternatives to mineral-based lubricants. Vegetable oils have high biodegradability and low production costs. Their poor thermo-oxidative stability and poor low temperature properties are disadvantages in their use as lubricant basestocks. In our study we used corn oil and diester mixtures, which become lubricants when additives are introduced. These mixtures of corn oil and di-2-ethylhexyl-adipate (DOA) and di-2-ethylhexyl-sebacate (DOS) offer a wide range of kinematic viscosities, pour points lower than-39°C and flash points over 218°C. The diameters of wear scars measured under four-ball testing (40 daN) are less than 0.90 mm and the copper strip corrosion test result is 1a. The differential scanning calorimetry study and thermogravimetric study under nitrogen atmosphere and in synthetic air are reported. From these studies a higher thermal stability was observed for corn oil than for diester oils. The thermo-oxidative instability occurred at temperatures higher than 350°C. The low production cost of corn oil and its mixtures with diesters makes them an attractive alternative to mineral oil lubricants.
Lubricants Derived from Castor Oil and Synthetic Diesters Mixtures
SUMMARY We present in this paper our results concerning the mixtures of castor oil and diesters (... more SUMMARY We present in this paper our results concerning the mixtures of castor oil and diesters (di-2-ethilhexiladipate and di-2-ethilhexilsebacate) as basestocks for lubricants. The obtained oils present intermediate characteristics between those of castor oil and of diesters, but higher to those of mineral oils of the same viscosities. The paper contains the physical-chemical and rheological properties, as well as a thermogravimetrical study of the considered oils.
Journal of the American Oil Chemists' Society, 2008
Environmentally friendly vegetable oils and their derivatives represent alternatives to mineral-b... more Environmentally friendly vegetable oils and their derivatives represent alternatives to mineral-based lubricants. Vegetable oils have high biodegradability and low production costs. Their poor thermo-oxidative stability and poor low temperature properties are disadvantages in their use as lubricant basestocks. In our study we used corn oil and diester mixtures, which become lubricants when additives are introduced. These mixtures of corn oil and di-2-ethylhexyl-adipate (DOA) and di-2-ethylhexyl-sebacate (DOS) offer a wide range of kinematic viscosities, pour points lower than -39°C and flash points over 218°C. The diameters of wear scars measured under four-ball testing (40 daN) are less than 0.90 mm and the copper strip corrosion test result is 1a. The differential scanning calorimetry study and thermogravimetric study under nitrogen atmosphere and in synthetic air are reported. From these studies a higher thermal stability was observed for corn oil than for diester oils. The thermo-oxidative instability occurred at temperatures higher than 350°C. The low production cost of corn oil and its mixtures with diesters makes them an attractive alternative to mineral oil lubricants.