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 E. Long

Research output: Contribution to journalArticle

100 Scopus citations

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 languageEnglish (US)
Pages (from-to)2522-2528
Number of pages7
JournalMacromolecular Chemistry and Physics
Volume212
Issue number23
DOIs
StatePublished - Dec 1 2011
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

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

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