イオン液体と膜科学の接点

抄録

Ionic liquids are known as organic salts having very low melting point ( <100 ℃). This unique organic liquid shows unusual properties such as negligible vapor pressure, high ionic conductivity, and high charge density. These ionic liquids have been coupled with polymer membrane to design functional membranes showing properties of ionic liquids. Similarly, polymerizable ionic liquids, containing vinyl group(s) on component ions, have been polymerized to get polyelectrolytes with very low glass transition temperature. Further these were cross–linked to prepare polymer gels keeping some properties of ionic liquids. Among many ionic liquids, there are some ionic liquids showing different hydrophobicity depending greatly on the temperature. Especially there are some salts showing lower critical solution temperature (LCST)–type phase change after mixing with water. Thermo–responsive polymer gels were prepared with these ionic liquids. A few applications of such functional ionic liquids have been mentioned from the viewpoint of the contact points with membrane science.