Well-Defined Polymeric Ionic Liquids with an Upper Critical Solution Temperature in Water

被引：94

作者：

Yoshimitsu, Hayato ^{[1
]}

Kanazawa, Arihiro ^{[1
]}

Kanaoka, Shokyoku ^{[1
]}

Aoshima, Sadahito ^{[1
]}

机构：

[1] Osaka Univ, Grad Sch Sci, Dept Macromol Sci, Toyonaka, Osaka 5600043, Japan

来源：

MACROMOLECULES | 2012年 / 45卷 / 23期

关键词：

LIVING CATIONIC-POLYMERIZATION; PHASE-SEPARATION BEHAVIOR; DIBLOCK COPOLYMERS; POLY(VINYL ETHER)S; VINYL ETHER; TRIBLOCK COPOLYMERS; OXYETHYLENE GROUPS; BLOCK-COPOLYMERS; POLY(N-ISOPROPYLACRYLAMIDE); TRANSITION;

D O I：

10.1021/ma301746u

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

An upper critical solution temperature (UCST)-type phase separation in water was achieved using well-defined polymeric ionic liquids (ILs) with imidazolyl groups in their side chains, prepared based on living cationic polymerization using a cationogen/Et1.5AlCl1.5 initiating system with 1,4-dioxane as an added base. Aqueous solutions of the polymers with tetrafluoroborate as counteranions showed sharp and reversible UCST-type phase separation at 5-15 degrees C. The effect of polymer concentration, chain-end groups, and molecular weight on the phase separation temperature suggests that the phase separation resulted from interpolymer electrostatic interactions. Other polymeric Its with SbF6- also showed a lower critical solution temperature-type phase separation in various organic solvents.

引用

页码：9427 / 9434

页数：8

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