文献类型：期刊文献

英文题名：Tuning phase behaviour of PEG-functionalized ionic liquids from UCST to LCST in alcohol-water mixtures

作者：Yao, Wenhui[1,2];Wang, Huiyong[1];Cui, Guokai[1];Li, Zhiyong[1];Wang, Jianji[1]

第一作者：Yao, Wenhui;姚文惠

通讯作者：Wang, JJ[1]

机构：[1]Henan Normal Univ, Sch Chem & Chem Engn, Collaborat Innovat Ctr Henan Prov Green Mfg Fine, Minist Educ,Key Lab Green Chem Media & React, Xinxiang 453007, Henan, Peoples R China;[2]Xinxiang Univ, Sch Civil Engn, Xinxiang 453003, Henan, Peoples R China

第一机构：Henan Normal Univ, Sch Chem & Chem Engn, Collaborat Innovat Ctr Henan Prov Green Mfg Fine, Minist Educ,Key Lab Green Chem Media & React, Xinxiang 453007, Henan, Peoples R China

通讯机构：[1]corresponding author), Henan Normal Univ, Sch Chem & Chem Engn, Collaborat Innovat Ctr Henan Prov Green Mfg Fine, Minist Educ,Key Lab Green Chem Media & React, Xinxiang 453007, Henan, Peoples R China.

年份：2016

卷号：18

期号：42

起止页码：29192-29198

外文期刊名：PHYSICAL CHEMISTRY CHEMICAL PHYSICS

收录：;Scopus(收录号：2-s2.0-84994052307);WOS:【SCI-EXPANDED(收录号:WOS:000387024300020)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 21273062, 21133009 and 21203057), the Program for Innovative Research Team in Science and Technology in University of Henan Province (No. 16IRTSTHN002), and the Plan for Scientific Innovation Talent of Henan Province (No. 144200510004).

语种：英文

摘要：Thermo-responsive materials with reversible phase transition in molecular solvents are of great importance for catalysis reaction, product separation, and catalyst recycling among others. In this work, liquid-liquid phase transition of PEG-functionalized ionic liquids [PEG(m)(mim)(2)][NTf2](2) (m = 200, 400, 600, 800, 1000) in aliphatic alcohol (ethanol, 1-propanol or isopropanol) and in aqueous aliphatic alcohol was investigated by turbidity and dynamic light scattering (DLS) measurements, and the effects of the alkyl chain length of the alcohol molecules and molecular weight of the PEG middle block of the ionic liquids on the phase transition behaviour were examined. It was found that these ionic liquids exhibited a unique UCST phase transition in the aliphatic alcohol, but their liquid-liquid phase transition behaviour could be tuned precisely from UCST to LCST in aqueous aliphatic alcohol. Furthermore, temperature-dependent FT-IR and/or H-1 NMR measurements were performed to understand the possible origin of phase behavior of both [PEG(m)(mim)(2)][NTf2](2) in the aliphatic alcohol and [PEG(800)(mim)(2)][NTf2](2) in ethanol-d(6)/H2O.