In the present work, the biobased protic ionic liquid crystal bis(2-hydroxyethyl) ammonium palmitate (DPA) has been studied as neat lubricant under linear reciprocating sliding at 75 °C, in the liquid crystalline region, and at 110 °C, above its melting point. Three different tribopairs have been studied using AISI 52100 steel, AISI 316L stainless steel and sapphire balls against AISI 316L disks. Tribological results at 75 °C are in agreement with the different sliding pairs and contact conditions. At 110 °C, a sharp friction coefficient reduction to reach an ultralow steady state value of 0.007–0.009, is observed for the sapphire-AISI 316L contact. Wear rate is also reduced in one order of magnitude. Results are related to water content in DPA, as determined by TG-MS. Wear mechanism are discussed upon the basis of optical and scanning electron microscopy (SEM/EDX) and of surface analysis by XPS.

在目前的工作中，生物基质子离子液晶双（2-羟乙基）棕榈酸铵（DPA）已在 75°C、液晶区域和 110°C 以上的线性往复滑动下作为纯润滑剂进行研究。它的熔点。使用 AISI 52100 钢、AISI 316L 不锈钢和蓝宝石球对 AISI 316L 圆盘研究了三种不同的摩擦对。75 °C 下的摩擦学结果与不同的滑动副和接触条件一致。在 110 °C 时，观察到蓝宝石-AISI 316L 触点的摩擦系数急剧下降，达到 0.007-0.009 的超低稳态值。磨损率也降低了一个数量级。结果与 DPA 中的水含量有关，由 TG-MS 确定。