The effect of multiple interactions including anion–macromolecule interaction, water-mediated ion–macromolecule interaction and hydrophobic interaction on the phase transition behaviors of random copolymers P(OEGMA-co-BVIm[X]) comprising oligo(ethylene glycol)methacrylate (OEGMA) and imidazolium-based ionic liquids is investigated in the present study. Temperature-variable ¹H NMR and FT-IR investigations demonstrated that the hydration of CH₂ side chains in P(OEGMA-co-BVIm[SCN]) was enhanced due to the anion–dipole interaction between a chaotropic anion SCN⁻ and CH₂ groups, and dehydration of CO groups served as the driving force of phase transition. In particular, the formation of CO⋯D₂O–PIL hydrogen bonds was preferred in P(OEGMA-co-BVIm[SCN]) during the phase transition process considering the interaction of IL–D₂O associations and CO groups. This water-mediated ion–macromolecule interaction acted as a “linkage” among polymers, resulting in the gradual dehydration of copolymers and the formation of stable small size micelles. As for P(OEGMA-co-BVIm[NTf₂]), water molecules were sequentially squeezed out of the polymer chains upon heating and the self-aggregation of polymer chains was carried out through hydrophobic interaction between OEGMA side chains with IL segments wrapped in the aggregates.

中文翻译：

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含阳离子聚（离子液体）的热响应共聚物的多重相互作用调节相变行为

阴离子-大分子相互作用，水介导的离子-大分子相互作用和疏水相互作用等多种相互作用对包含低聚（乙二醇）甲基丙烯酸甲酯（OEGMA）的无规共聚物P（OEGMA- co- BVIm [X]）的相变行为的影响本研究研究了咪唑类离子液体。温度可变¹ H NMR和FT-IR的调查表明，CH的水合₂侧链在P（OEGMA-共-BVIm [SCN]）中的溶液增强由于离液阴离子SCN之间的阴离子-偶极相互作用^-和CH ₂团和C的脱水O组是相变的驱动力。特别是，考虑到IL–D ₂ O缔合和C O基团的相互作用，在相变过程中P（OEGMA- co -BVIm [SCN]）中优选形成C O⋯D ₂ O–PIL氢键。这种水介导的离子-大分子相互作用充当聚合物之间的“连接”，导致共聚物逐渐脱水并形成稳定的小尺寸胶束。至于P（OEGMA- co -BVIm [NTf ₂]），加热后将水分子从聚合物链中依次挤出，并通过OEGMA侧链与包裹在聚集物中的IL链段之间的疏水相互作用进行聚合物链的自聚集。