Abstract
Structure-property relationships for polymerized ionic liquids (PILs) relate chemical structure to ionic conductivity and reveal the importance of glass transition temperature (Tg) and the energy associated with an ion-hopping mechanism for ion conduction for a series of alkyl-substituted vinylimidazolium PILs. The alkyl-substituted vinylimidazolium-based PILs with varying lengths of n-alkyl substituents provide diverse precursors with exchangeable anions to further enhance thermal stability and ionic conductivity. As the anion size increases, regardless of alkyl substituent length, T g decreases and the onset of weight loss, TD, increases. As the length of the alkyl substituent increases, Tg decreases for PILs with Br- and BF4- counteranions. Ionic conductivity increases over an order of magnitude upon exchange of the counteranion from TfO- < Tf2N-.
Original language | English (US) |
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Pages (from-to) | 2522-2528 |
Number of pages | 7 |
Journal | Macromolecular Chemistry and Physics |
Volume | 212 |
Issue number | 23 |
DOIs | |
State | Published - Dec 1 2011 |
Externally published | Yes |
Keywords
- VFT-dependent conductivity
- anion exchange
- imidazolium
- ionic conductivity
- polymerizable ionic liquid
ASJC Scopus subject areas
- Condensed Matter Physics
- Materials Chemistry
- Polymers and Plastics
- Physical and Theoretical Chemistry
- Organic Chemistry