摘要
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 5.0×10^(3) to 2.0×10^(4),the critical temperature decreases by about 67℃,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.
基金
supported by the National Natural Science Funds for Distinguished Young Scholar(No.21725401)
the National Key R&D Program of China(No.2017YFA0207800)
the China Postdoctoral Science Foundation(No.2019M650434).
