Experimental study on expended energy on structural degradation of lubricating greases was written by Ahme, Leif;Kuhn, Erik;Delgado Canto, Miguel Angel. And the article was included in Tribology Letters in 2022.Name: Glyceryl monostearate The following contents are mentioned in the article:
One of the keystones of tribol. studies is the energetical approach to the lubrication process. In the particular case of lubricating greases, part of the lubrication process energy dissipates due to a shear-induced structural rearrangement of the 3D network of the thickening agent dispersed in the base oil. This fact confers them a particular consistency, mech. stability, rheol., and tribol. behavior. In this research work, we investigate the mech. structural degradation induced by shear stress applied in rheol. tests (rotational and oscillation mode) and the influence of thickener (type and composition) and base oil on both the degradation process and the expended mech. energies. For this purpose, lithium, calcium and polyurea-based greases of NLGI grade 2 were used. These greases have been manufactured with a different base oil (mineral, synthetic and vegetable oils) and kinematic viscosity of 48 or 240 mm2/s. Some biogenic greases were also included in this research. The optical microscopy anal. revealed thickener particles-based agglomerates with different shapes and sizes that reduced notably, if not almost completely destroyed, after stress. Due to the thickener particles-based agglomerates distribution, significant differences in the shear-induced frictional energy inside the bulk grease during the shear process were detected. The size of agglomerates depended on both the thickener content and the base oil viscosity and not the type of base oil. This study involved multiple reactions and reactants, such as Glyceryl monostearate (cas: 31566-31-1Name: Glyceryl monostearate).
Glyceryl monostearate (cas: 31566-31-1) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Name: Glyceryl monostearate
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics