A series of polyvinylimidazolium cations containing an ethyl, mono, or triethylene oxide pendant groups with [TFSI]- anion as counterion were synthesized via radical polymerization. The physical properties and ion conduction behaviors of the polymerized ionic liquids (PILs) were investigated to elucidate the effects of ethylene oxide unit. As the length of the ethylene oxide pendant group in the PILs increased, the glass transition temperature of PIL decreased and the ionic conductivity increased, implying that the introduction of ethylene oxide pendant group on the imidazolium cation improved the chain mobility of the resulting polymer macromolecules. When an equimolar amount of LiTFSI to the ionic groups in the PIL was added, the ionic conductivities were further enhanced up to 3 × 10-5 S cm -1 at room temperature.
Bibliographical noteFunding Information:
This work was financially supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, Republic of Korea, and partially by a grant from Center for Materials Architecting of Korea Institute of Science and Technology (KIST).
- Ionic conductivity
- Polymer electrolyte
- Polymerized ionic liquid
ASJC Scopus subject areas
- General Physics and Astronomy
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry