Polyurethanes containing an imidazolium diol-based ionic-liquid chain extender for incorporation of ionic-liquid electrolytes

Renlong Gao, Mingqiang Zhang, Shih Wa Wang, Robert B. Moore, Ralph H. Colby, Timothy E. Long

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Novel polyurethane (PU) cationomers are synthesized using an imidazolium diol-based ionic liquid (IL) chain extender. A systematic comparison with a non-ionic PU analogue reveals effect of the imidazolium cation on physical properties, hydrogen bonding, and morphology of segmented PU. Casting resulting PU solutions with various contents of IL generates novel membranes. Thermal study reveals that IL-containing PU membranes exhibit a constant soft segment Tg at -81 °C; however, the Tg of imidazolium hard segments systematically shifts to lower temperatures with increasing IL content. This suggests that IL preferentially locates into the imidazolium ionic hard domains, which is also evident in small-angle X-ray scattering. Moreover, dielectric relaxation spectroscopy demonstrates increased ionic conductivity of PU membranes by 5 orders of magnitude upon incorporation of 30 wt% IL. Imidazolium-containing polyurethane cationomers serve as nanoscale templates for the incorporation of ionic-liquid electrolytes. Controlled charge density and location of the ionic sites, exclusively in the hard segment, directs the electrolyte to specific domains for enhanced ionic conductivity while maintaining membrane ductility.

Original languageEnglish (US)
Pages (from-to)1027-1036
Number of pages10
JournalMacromolecular Chemistry and Physics
Volume214
Issue number9
DOIs
StatePublished - May 14 2013

Fingerprint

Ionic Liquids
Polyurethanes
Ionic liquids
Electrolytes
electrolytes
liquids
membranes
Membranes
Ionic conductivity
ion currents
Dielectric relaxation
Charge density
ductility
X ray scattering
Ductility
Cations
Hydrogen bonds
Casting
templates
Physical properties

All Science Journal Classification (ASJC) codes

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

Cite this

Gao, Renlong ; Zhang, Mingqiang ; Wang, Shih Wa ; Moore, Robert B. ; Colby, Ralph H. ; Long, Timothy E. / Polyurethanes containing an imidazolium diol-based ionic-liquid chain extender for incorporation of ionic-liquid electrolytes. In: Macromolecular Chemistry and Physics. 2013 ; Vol. 214, No. 9. pp. 1027-1036.
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Polyurethanes containing an imidazolium diol-based ionic-liquid chain extender for incorporation of ionic-liquid electrolytes. / Gao, Renlong; Zhang, Mingqiang; Wang, Shih Wa; Moore, Robert B.; Colby, Ralph H.; Long, Timothy E.

In: Macromolecular Chemistry and Physics, Vol. 214, No. 9, 14.05.2013, p. 1027-1036.

Research output: Contribution to journalArticle

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