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ARS Home » Research » Publications at this Location » Publication #146342


item Cermak, Steven - Steve
item Isbell, Terry

Submitted to: World Congress International Society for Fat Research
Publication Type: Abstract Only
Publication Acceptance Date: 10/15/2003
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Two major problems with vegetable oils as functional fluids are low resistance to thermal oxidative stability and poor low temperature properties. However, with the addition of additives these properties can sometimes be improved, but only at the sacrifice of biodegradability, toxicity, and cost. Vegetable oils and their derivatives show superior biodegradability as compared to petroleum oils and synthetic esters in actual field studies. The low temperature properties are usually measured at the materials pour point, the minimum temperature at which a material will still pour, while the oxidative stability is measured with the rotating bomb oxygen test (RBOT) which is the standard test for lubricants. A series of estolides from a host of different new crops have been synthesized and tested. The general estolide structures have been modified to meet certain physical properties and cost requirements. These new estolide esters have displayed far superior low temperature properties (pp -36 deg C), and were more suitable as a base stock for biodegradable lubricants and functional fluids than current commercial materials. Synthesis of estolides from fatty acids and from hydroxy oils will be discussed as well as their physical properties, which include pour and cloud points, RBOT, and viscosities.