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

作者：Yoshimitsu Hayato; Kanazawa Arihiro; Kanaoka Shokyoku; Aoshima Sadahito^*

来源：Macromolecules, 2012, 45(23): 9427-9434.

DOI：10.1021/ma301746u

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.

• 出版日期2012-12-11