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首页> 外文期刊>Chemistry: A European journal >Insight into the interactions that control the phase behaviour of new aqueous biphasic systems composed of polyethylene glycol polymers and ionic liquids
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Insight into the interactions that control the phase behaviour of new aqueous biphasic systems composed of polyethylene glycol polymers and ionic liquids

机译：深入了解控制由聚乙二醇聚合物和离子液体组成的新型水性双相系统的相行为的相互作用

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摘要

New polyethylene glycol (PEG)/ionic liquid aqueous biphasic systems (ABS) are presented. Distinct pairs of PEG polymers and ionic liquids can induce phase separation in aqueous media when dissolved at appropriate concentrations. Phase diagrams have been determined for a large array of systems at 298, 308 and 323 K. A comparison of the binodal curves allowed the analysis of the tunable structural features of the ionic liquid (i.e., anionic nature, cationic core, cationic alkyl side chain length and functionalisation, and number of alkyl substituents in the cation) and the influence of the molecular weight of the PEG polymer on the ability of these solutes to induce an ABS. It was observed that contrary to typical ABS based on ionic liquids and inorganic salts, in which the phase behaviour is dominated by the formation of the hydration complexes of the ions, the interactions between the PEG polymers and ionic liquids control the phase demixing in the polymer-type ABS studied herein. It is shown that both the ionic liquids and PEG polymers can act as the salting-out species; that is, it is an occurrence that is dependent on the structural features of the ionic liquid. For the first time, PEG/ionic liquid ABS are reported and insight into the major interactions that govern the polymer/ionic liquid phase behaviour in aqueous media are provided. The use of two different nonvolatile and tunable species (i.e., ionic liquids and PEG polymers) to form ABS allows the polarities of the phases to be tailored. Hence, the development of environmentally friendly separation processes that make use of these novel systems is envisaged.
机译：提出了新的聚乙二醇（PEG）/离子液体水性双相系统（ABS）。当以适当的浓度溶解时，成对的PEG聚合物和离子液体可在水性介质中引起相分离。已经确定了在298、308和323 K下的各种系统的相图。通过比较二叉曲线，可以分析离子液体的可调结构特征（即，阴离子性质，阳离子核，阳离子烷基侧链）长度和功能化，以及阳离子中烷基取代基的数量）以及PEG聚合物分子量对这些溶质诱导ABS能力的影响。观察到，与典型的基于离子液体和无机盐的ABS相反，在这种状态下，相行为主要由离子的水合配合物的形成决定，PEG聚合物和离子液体之间的相互作用控制着聚合物中的相分离本文研究的A型ABS。结果表明，离子液体和PEG聚合物均可充当盐析物质。即，这取决于离子液体的结构特征。首次报道了PEG /离子液体ABS，并深入了解了控制水性介质中聚合物/离子液体行为的主要相互作用。使用两种不同的非易失性和可调性物质（即离子液体和PEG聚合物）形成ABS，可以调整相的极性。因此，设想开发利用这些新颖系统的环境友好的分离方法。

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