It indicates that less KV change with temperature is observed for the gallate ester oils during lubrication. With an increase in the length of the ester chain, an increasing trend in the VIs is observed, e.g., VI (3C 8 –C 3 , 112) < VI (3C 8 –C i5 , 116) < VI (3C 8 –C i8 , 119) and VI (3C 4 –C i8 , 81) < VI (3C 8 –C i8 , 119) < VI (3C 12 –C i8 , 135). 23 , 38 In addition, the introduction of branched chains decreases the VI of the gallate esters, e.g., VI (3C i8 –C i8 , 81) < VI (3C 8 –C i8 , 119). 35 , 37 From Table 1 , it is observed that the densities at 20 °C ( d 20 ) of the gallate ester oils vary from 0.96 to 1.07.
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Ester Oils Prepared from Fully Renewable Resources and Their Lubricant Base Oil Properties.
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