Alkyl-substituted N-vinylimidazolium polymerized ionic liquids: Thermal properties and ionic conductivities

Matthew D. Green, David Salas-De La Cruz, Yuesheng Ye, John M. Layman, Yossef A. Elabd, Karen I. Winey, Timothy Edward Long

Research output: Contribution to journalArticle

96 Citations (Scopus)


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 languageEnglish
Pages (from-to)2522-2528
Number of pages7
JournalMacromolecular Chemistry and Physics
Issue number23
Publication statusPublished - 2011 Dec 1
Externally publishedYes



  • anion exchange
  • imidazolium
  • ionic conductivity
  • polymerizable ionic liquid
  • VFT-dependent conductivity

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

Cite this

Green, M. D., Salas-De La Cruz, D., Ye, Y., Layman, J. M., Elabd, Y. A., Winey, K. I., & Long, T. E. (2011). Alkyl-substituted N-vinylimidazolium polymerized ionic liquids: Thermal properties and ionic conductivities. Macromolecular Chemistry and Physics, 212(23), 2522-2528.