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Alkyl‐Substituted N ‐Vinylimidazolium Polymerized Ionic Liquids: Thermal Properties and Ionic Conductivities
Author(s) -
Green Matthew D.,
Salasde la Cruz David,
Ye Yuesheng,
Layman John M.,
Elabd Yossef A.,
Winey Karen I.,
Long Timothy E.
Publication year - 2011
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201100389
Subject(s) - alkyl , substituent , ionic liquid , ionic conductivity , chemistry , ionic bonding , thermal stability , polymerization , polymer chemistry , glass transition , ion , inorganic chemistry , polymer , catalysis , organic chemistry , electrode , electrolyte
Structure‐property relationships for polymerized ionic liquids (PILs) relate chemical structure to ionic conductivity and reveal the importance of glass transition temperature ( T g ) 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, T D , increases. As the length of the alkyl substituent increases, T g decreases for PILs with Br − and BF 4 − counteranions. Ionic conductivity increases over an order of magnitude upon exchange of the counteranion from TfO − < Tf 2 N − .