Ionic liquid crystals (ILCs) derived from functional compounds obtained from natural sources, such as fatty acids (FAs), are promising compounds due to their sustainable appeal, low cost, and nutritional value. To expand the application of naturally-derived ILCs, this work discloses the use of the oligomeric approach to tune the LC and melting profiles of ILCs derived from FAs (stearic and oleic acids) and choline by mixing them to their parent FA. The oligomeric systems were investigated through the characterization of the solid-[liquid crystal]-liquid (S-LC-L) thermodynamic equilibrium. S-LC transitions were modelled using Margules and Margules-UNIFAC approaches, with the former presenting better results. The systems presented melting profiles similar to eutectic mixtures with a nonideal behavior and formation of solid solutions. The reduction of the melting point and the LC temperature window was related to the concentration and presence of unsaturation in the molecular structure of the components. The LC mesophases were formed at a wide temperature and FA concentration range. Oleic acid-based system presented lower melting points and a broader LC temperature domain with possibly two types of mesophases (lamellar and inverted hexagonal). Therefore, the oligomeric approach promoted the tunability of the LC and melting profiles of naturally-derived ILCs, which might expand their industrial applicability as lubricants, solvents and reaction media for low or high temperature processes, or as structuring agents (e.g. melting profile modifier) for the design of natural-based products.

从天然来源获得的功能性化合物（如脂肪酸（FA））衍生的离子液晶（ILC）因其可持续的吸引力、低成本和营养价值而成为有前景的化合物。为了扩大天然来源的 ILC 的应用，这项工作公开了使用寡聚方法来调整来自 FA（硬脂酸和油酸）和胆碱的 ILC 的 LC 和熔解曲线，方法是将它们与它们的母体 FA 混合。通过对固体-[液晶]-液体 (S-LC-L) 热力学平衡的表征来研究低聚体系。S-LC 跃迁使用 Margules 和 Margules-UNIFAC 方法建模，前者具有更好的结果。该系统呈现出类似于具有非理想行为和固溶体形成的共晶混合物的熔化曲线。熔点和 LC 温度窗口的降低与组分分子结构中的浓度和不饱和度的存在有关。LC 中间相是在很宽的温度和 FA 浓度范围内形成的。基于油酸的系统具有较低的熔点和较宽的 LC 温度域，可能有两种类型的中间相（层状和倒六边形）。因此，低聚方法促进了 LC 的可调性和天然来源的 ILC 的熔融曲线，这可能会扩大其作为润滑剂、溶剂和低温或高温过程的反应介质，或作为结构剂（例如熔融曲线改性剂）的工业适用性用于设计天然产品。