The combination of ionic liquids (ILs) with polymers have attracted mushroom attention due to their complementary advantages. Hydrogen bonding interactions is usually responsible for the final properties of the obtained polymer/IL products. In this study, the interactions between an IL 1-(2-hydroxyethyl)-3-methylimidazolium chloride ([HOEtMIM]Cl) and poly(vinyl alcohol) (PVA) have been investigated in detail by using in situ FTIR spectroscopy. In addition, two-dimensional (2D) correlation infrared spectroscopy and perturbation correlation moving-window two-dimensional (PCMW2D) technique were also employed to study the microdynamics mechanism. Hydrogen bonding interactions of PVA-IL is highly dependent on the ILs content and the temperature. Hydrogen bonds of PVA itself dominated in the system at a low ILs content of 15 wt%. However, with increasing ILs content, hydrogen bonding interactions of PVA-ILs gradually played a major role within PVA/IL system. It was also demonstrated that hydrogen bonds between PVA and ILs interacted most strongly in the temperature range of 81–120°C.PVA/IL system is thermodynamically compatible without phase behavior, as evidenced by DMA and optical microscopy test. This research work provides a new strategy for the performance adjustment of PVA/IL materials at the theoretical level, allowing fine-tuning of their physicochemical properties for new applications in various fields such as energy storage, sensors, and actuators.

中文翻译：

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聚乙烯醇与离子液体氢键相互作用机理研究

离子液体 (IL) 与聚合物的组合由于其互补优势而引起了广泛关注。氢键相互作用通常是所获得的聚合物/IL 产品的最终性能的原因。在这项研究中，使用原位 FTIR 光谱详细研究了 IL 1-（2-羟乙基）-3-甲基咪唑氯化物（[HOEtMIM]Cl）和聚乙烯醇（PVA）之间的相互作用。此外，还采用二维（2D）相关红外光谱和微扰相关移动窗口二维（PCMW2D）技术来研究微动力学机制。PVA-IL 的氢键相互作用高度依赖于 IL 含量和温度。PVA 本身的氢键在系统中占主导地位，ILs 含量低至 15 wt%。然而，随着ILs含量的增加，PVA-ILs的氢键相互作用逐渐在PVA/IL体系中发挥重要作用。还证明了 PVA 和 IL 之间的氢键在 81-120°C 的温度范围内相互作用最强。PVA/IL 系统在热力学上兼容，没有相行为，如 DMA 和光学显微镜测试所证明的那样。这项研究工作为在理论水平上调整 PVA/IL 材料的性能提供了新的策略，允许微调它们的理化性质，以用于储能、传感器和执行器等各个领域的新应用。还证明了 PVA 和 IL 之间的氢键在 81-120°C 的温度范围内相互作用最强。PVA/IL 系统在热力学上兼容，没有相行为，如 DMA 和光学显微镜测试所证明的那样。这项研究工作为在理论水平上调整 PVA/IL 材料的性能提供了新的策略，允许微调它们的理化性质，以用于储能、传感器和执行器等各个领域的新应用。还证明了 PVA 和 IL 之间的氢键在 81-120°C 的温度范围内相互作用最强。PVA/IL 系统在热力学上兼容，没有相行为，如 DMA 和光学显微镜测试所证明的那样。这项研究工作为在理论水平上调整 PVA/IL 材料的性能提供了一种新策略，允许微调它们的理化性质，以用于储能、传感器和执行器等各个领域的新应用。