1. Tunable Lower Critical Solution Temperature of Poly(butyl acrylate) in Ionic Liquid Blends.
- Author
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Chen, Lie, Huang, Jin, Zhao, Cong, Zhou, Jia-Jia, and Liu, Ming-Jie
- Subjects
CRITICAL temperature ,CHEMICAL structure ,PHASE diagrams ,MOLECULAR weights ,POLYMER structure ,IONIC liquids ,ACRYLATES - Abstract
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 2.0×104 , 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. [ABSTRACT FROM AUTHOR]- Published
- 2021
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