2017年12月
Thermosensitive Phase Separation Behavior of Poly(benzyl methacrylate)/Solvate Ionic Liquid Solutions
LANGMUIR
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- 巻
- 33
- 号
- 49
- 開始ページ
- 14105
- 終了ページ
- 14114
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/acs.langmuir.7b03378
- 出版者・発行元
- AMER CHEMICAL SOC
We report a lower critical solution temperature (LOST) behavior of binary systems consisting of poly(benzyl methacrylate) (PBnMA) and solvate ionic liquids: equimolar mixtures of triglyme (G3) or tetraglyme (G4) and lithium bis(trifluoromethanesulfonyDamide. We evaluated the critical temperatures (T(c)s) using transmittance measurements. The stability of the glyme-Li+ complex ([Li(G3 or G4)](+)) in the presence of PBnMA was confirmed using Raman spectroscopy, pulsed-field gradient spin echo NMR. (PGSE-NMR), and thermogravimetric analysis to demonstrate that the complex was not disrupted. The interaction between glyme-Li+ complex and PBnMA was investigated via Li-7 NMR chemical shifts. Upfield shifts originating from the ring-current effect of the aromatic ring within PBnMA were observed with the addition of PBnMA, indicating localization of the glyme-Li+ complex above and below the benzyl group of PBnMA, which may be a reason for negative mixing entropy, a key requirement of the LCST.
- リンク情報
- ID情報
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- DOI : 10.1021/acs.langmuir.7b03378
- ISSN : 0743-7463
- Web of Science ID : WOS:000418206500024