Modes of Interaction in Binary Blends of Hydrophobic Polyethers and Imidazolium Bis(trifluoromethylsulfonyl)imide Ionic Liquids

被引：9

作者：

Bentley, Caitlin L. ^{[1
]}

Chwatko, Malgorzata ^{[1
]}

Wheatle, Bill K. ^{[1
]}

Burkey, Aaron A. ^{[1
]}

Helenic, Alysha ^{[1
]}

Morales-Collazo, Oscar ^{[1
]}

Ganesan, Venkat ^{[1
]}

Lynd, Nathaniel A. ^{[1
]}

Brennecke, Joan F. ^{[1
]}

机构：

[1] Univ Texas Austin, McKetta Dept Chem Engn, Austin, TX 78712 USA

来源：

MACROMOLECULES | 2020年 / 53卷 / 15期

基金：

美国国家科学基金会;

关键词：

TEMPERATURE PHASE-BEHAVIOR; POLY(ETHYLENE OXIDE); SEPARATION BEHAVIOR; POLYMER BLENDS; CARBON-DIOXIDE; CO2; SOLVENTS; EXTRACTION; MIXTURES; GELS;

D O I：

10.1021/acs.macromol.0c01155

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Lower critical solution behavior in binary blends of hydrophobic polyethers with 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ahmim][Tf2N]) exhibited a difference in lower critical solution temperature (LCST) greater than 80 degrees C between structurally homologous poly(isopropyl glycidyl ether) (PiPGE) and poly(n-butyl glycidyl ether) (PnBGE). Replacement of the acidic hydrogen on the imidazolium ring with a methyl group (i.e., 2,3-dimethyl-1-hexyl-imidazolium bis(trifluoromethylsulfonyl)imide ([hmmim] [Tf2N])) significantly reduced the LCST of both the PnBGE/ionic liquid (IL) mixture and the PiPGE/IL mixture. Differing degrees of hydrogen bonding between the polymer and the cation cannot alone explain the observed behavior. Similar hydrogen bonding between the [hmim](+ )cation and both polymers from molecular dynamics simulations was consistent with this conclusion. However, stronger [hmim](+) cation tail/polymer alkyl side-chain interactions for PnBGE, with consequently stronger cation/anion interactions, point to solvophobic interactions as the basis for the large LCST difference between the PnBGE/[hmim][Tf2N] and PiPGE/[hmim][Tf2N] blends.

引用

页码：6519 / 6528

页数：10

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