Lee Minjung, Perry Sarah L, Hayward Ryan C
Department of Polymer Science and Engineering, University of Massachusetts, Amherst, 120 Governors Drive, Amherst, Massachusetts 01003-9263, United States.
Department of Chemical Engineering, University of Massachusetts, Amherst, 686 North Pleasant Street, Amherst, Massachusetts 01003-9303, United States.
ACS Polym Au. 2021 Aug 24;1(2):100-106. doi: 10.1021/acspolymersau.1c00017. eCollection 2021 Oct 13.
Oppositely charged polymerized ionic liquids (PILs) were used to form complex coacervates in two different organic solvents, 2,2,2-trifluoroethanol (TFE) and hexafluoro-2-propanol (HFIP), and the corresponding phase diagrams were constructed using UV-vis, NMR, and turbidity experiments. While previous studies on complex coacervates have focused almost exclusively on aqueous environments, the use of PILs in the current work enabled studies in solvents with substantially lower dielectric constants (27.0 for TFE, 16.7 for HFIP). The critical salt concentration required to induce complete miscibility was roughly 2-fold larger in HFIP compared with TFE, and two different PIL complexes, solidlike precipitates and liquidlike coacervates, were found in both systems. This study provides insight into the effects of low-dielectric-constant solvents on complex coacervation, which has not been widely studied because of the limited solubility of conventional polyelectrolytes in these media.
带相反电荷的聚合离子液体（PILs）被用于在两种不同的有机溶剂2,2,2-三氟乙醇（TFE）和六氟-2-丙醇（HFIP）中形成复合凝聚层，并通过紫外可见光谱、核磁共振和浊度实验构建了相应的相图。虽然之前关于复合凝聚层的研究几乎完全集中在水性环境中，但在当前工作中使用PILs使得能够在介电常数低得多的溶剂（TFE为27.0，HFIP为16.7）中进行研究。与TFE相比，在HFIP中诱导完全互溶所需的临界盐浓度大约高出2倍，并且在两个体系中都发现了两种不同的PIL复合物，即类固体沉淀和类液体凝聚层。这项研究深入了解了低介电常数溶剂对复合凝聚的影响，由于传统聚电解质在这些介质中的溶解度有限，这方面尚未得到广泛研究。
