Tunable Lower Critical Solution Temperature of Poly(butyl acrylate) in Ionic Liquid Blends
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ARTICLE
POLYMER SCIENCE
https://doi.org/10.1007/s10118-021-2522-2 Chinese J. Polym. Sci.
Tunable Lower Critical Solution Temperature of Poly(butyl acrylate) in Ionic Liquid Blends Lie Chena,b, Jin Huanga, Cong Zhaoa, Jia-Jia Zhoua,c, and Ming-Jie Liua,c* a Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China b School of Physics, Beihang University, Beijing 100191, China c International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, China
Electronic Supplementary Information 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 5.0×103 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. Keywords PBA; Ionic liquid; LCST; Thermo-responsive Citation: Chen, L.; Huang, J.; Zhao, C.; Zhou, J. J.; Liu, M. J. Tunable lower critical solution temperature of poly(butyl acrylate) in ionic liquid blends. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-021-2522-2
INTRODUCTION Ionic liquids (ILs) are a class of solvents that have drawn great attention during the past two decades due to their appealing physicochemical properties such as negligible vapor pressure, good chemical and thermal stability, wide liquid temperature ranges, and high ionic conductivity. ILs are known as “designer solvents” because of the ability to select the appropriate anion and cation to achieve the desired properties.[1] The polymer/ILs composite system is a major research interest regarding ILs as the solvent, which has been widely investigated and show broad applications such as polymer electrolytes in lithium batteries and solar cells.[2−4] In addition, the ionogels formed by crosslinking of polymer or self-assembly of block copolymer in ILs gradually received increasing attention in recent years due to their shapeable and leakagefree properties, which are favorable to wearable and portable devices.[5,6] Their possible applications include membranes for fuel cells and gas separations, gels for solid-state electrolyte and thin-film transistors.[7−10] Therefore, to optimize the practical application of polymer/ILs based materials, it is important to understand the miscibility and mixing mechanism of these two components.
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