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Tunable Lower Critical Solution Temperature of Poly(butyl acrylate) in Ionic Liquid Blends
Chinese Journal of Polymer Science ( IF 4.1 ) Pub Date : 2020-11-26 , DOI: 10.1007/s10118-021-2522-2
Lie Chen , Jin Huang , Cong Zhao , Jia-Jia Zhou , Ming-Jie Liu

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.



中文翻译:

离子液体共混物中聚丙烯酸丁酯的可调下临界溶液温度

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。

更新日期:2020-12-01
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