We describe the lower critical solution temperature (LCST)-type phase behavior of poly(butyl acrylate) (PBA) dissolved in hydrophobic 1-alkyl-3-methylimidazolium bis{(trifluoromethyl) sulfonyl}amide ionic liquids (ILs). The temperature-composition phase diagrams of these PBA/ILs systems are strongly asymmetric with the critical composition shifted to low concentrations of PBA. As the molecular weight increases from 5.0×10³ to 2.0×10⁴, the critical temperature decreases by about 67 °C, and the critical composition shifts to a lower concentration. Furthermore, the LCST of PBA/ILs system increases as increasing the alkyl side chain length in the imidazolium cation. Using IL blends as solvents, the LCST of PBA can be tuned almost linearly over a wide range by varying the mixing ratio of two ionic liquids without modifying the chemical structure of the polymers.

我们描述了溶解在疏水的1-烷基-3-甲基咪唑鎓双{（（三氟甲基）磺酰基}酰胺离子液体（ILs）中的聚丙烯酸丁酯（PBA）的较低的临界溶液温度（LCST）型相行为。这些PBA / ILs系统的温度组成相图非常不对称，其关键组成转移到了低浓度的PBA。随着分子量从5.0×10 ³增加到2.0×10 ⁴，临界温度降低了约67°C，临界组成转移到了更低的浓度。此外，随着咪唑鎓阳离子中烷基侧链长度的增加，PBA / ILs系统的LCST也会增加。使用IL共混物作为溶剂，可以通过改变两种离子液体的混合比例，在很宽的范围内几乎线性地调节PBA的LCST，而无需改变聚合物的化学结构。