الفهرس 
Vegetable Oils and LubricantsOnly 14 pages are availabe for public view
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Abstract
English summary
Utilization of renewable energy sources is one of the finest resolutions to solve issues related to environment and energy demands. The desire to replace petroleum-based materials with environmentally friendly and sustainable alternatives has stimulated the development of vegetable oil-based materials as biolubricants.
There is a growing interest on development of vegetable oil-based lubricant or commonly also known as biolubricant. Biolubricants have lesser threat to the environment and has shown to have better lubricity characteristics as compared to mineral oil-based lubricant. Vegetable oil-based lubricants have their own limitations despite being more desirable over mineral oil-based lubricants, e.g., oxidative, and thermal stability, and inadequate low temperature fluidity due to high pour points.
The limitations mentioned above can be reduced by chemically modifying the structures of the vegetable oils, such as through transesterification of vegetable oil methyl esters and branched neopolyols like trimethylolpropane (TMP) to produce polyol esters. Polyol esters molecules derived from this type of multi-functional synthetic alcohol are chemically more stable because of their quaternary or neopentyl carbon. Trimethylolpropane triesters (TMPTE) is one kind of polyol esters which is classified under group V base oil and has been used as base fluids in lubricants. Depending on the properties of lubricant needed for certain applications such as hydraulic oil or metal working fluid, the polyol esters can be blended with other base oil and additives to meet the specifications required.
The improvement in oxidative and thermal stability of vegetable oil is made possible because of hydrogen atom on the beta-carbon position is