Research Article
Diesters Biolubricant Base Oil: Synthesis, Optimization, Characterization, and Physicochemical Characteristics
Table 5
The main wavelengths in FTIR functional groups of HYOOA and OLHYOOD.
| | Wavelength of HYOOAa | Wavelength of OLHYOODb | Functional groups |
| | 3413 | 3445 | OH stretching (alcohol) | | 3003 | 3003 | C=C bending vibration (aliphatic) | | 2925, 2855 | 2925, 2554 | C–H stretching vibration (aliphatic) | | 1737 | 1738 | C=O stretching vibration (ester) | | 1711 | — | C=O stretching vibration (carboxylic acid) | | 1461 | 1461 | C–H scissoring and bending for methylene group | | 1176, 1117 | 1173,1117 | C–O stretching vibration (ester) | | 1279 | — | C–O stretching assymmetric (carboxylic acid) | | 967 | 967 | C–H bending vibration (alkene) | | 723 | 723 | C–H group vibration (aliphatic) |
|
|
Notes: 9(12)-hydroxy-10(13)-oleioxy-12(9)-octadecanoic acid (a); oleyl 9(12)-hydroxy-10(13)-oleioxy-12(9)-octadecanoate (b).
|
