Open AccessLubricity, Tribological and Rheological Properties of Green Ester Oil Prepared from Bio-Based Azelaic Acid
Author(s) -
Waled Abdo Ahmed,
Nadia Salih,
Jumat Salimon
Publication year - 2021
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2021.23209
Subject(s) - chemistry , organic chemistry , viscosity index , flash point , castor oil , lubricity , materials science , base oil , composite material , scanning electron microscope
Plant oil derived compounds have been used as the raw material for the synthesis of green biolubricant.Azelaic acid derived from oleic acid is one of the interesting compounds. The synthesis of azelateesters oil based synthetic green biolubricants was carried out. The esterification process of azelaicacid with variety type of alcohols was catalyzed by concentrated H2SO4. The yields percentages ofazelate esters oil produced were varied depending their overall molecular structure. The azelate estersoil properties were evaluated for their suitability as a biolubricant. The results showed that the linearazelate esters oil showed high pour point values in a range of 15 to 5 ºC for di-decyl azelate, di-octylazelate and di-hexyl azelate respectively. On the other hands, the branch azelate esters oil showed verylow pour point of -70, -58 and -50 ºC for di-2-butyloctyl azelate, di-2-ethylhexanol azelate anddi-2-ethylbutyl azelate, respectively. Moreover, the linear azelate esters oil gave high values of flashpoint, viscosity index and oxidative stability, and they were slightly affected by branching moleculestructure. The tribological and rheological properties of high molecular azelate esters oil were alsoperformed. Subsequently, most of them were classified as non-Newtonian fluids and having boundarylubrication properties with low friction coefficient. The branch azelate esters oil is plausible to be usedas green biolubricants in many applications including automotive, marine engine oils, compressoroils, hydraulic fluids, gear oils and industrial biolubricants.