Low-Temperature Rheology and Thermoanalytical Investigation of Lubricating Greases: Influence of Thickener Type and Concentration on Melting, Crystallization and Glass Transition

This study investigates crystallization, melting and glass transition of Li- Ca-12-hydroxystearate greases in relation to the pour point corresponding oils. The base oils for are mineral oil, polyalphaolefin, alkylated naphthalene, propylene glycol, trimellitate. For oil-based crystallization temperature Tc increases Tm decreases upon addition thickener. oil then is 3 K below does not properly define lowest application (MO) based greases. Both thickeners induce a small increase (1–3 K) synthetic glycol. correlates well with onset grease indicated by sharp viscosity. Pure trimellitate unbranched alkyl chains crystallize cooling but shows noticeable supercooling cold crystallization. As percentage thickener increases, more crystallizes 20 above without (?44 °C). Here, changes behavior from homogeneous heterogeneous thus acts as nucleus. provide information on which stiffen significantly due