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 Edward Long*

*この研究の対応する著者

研究成果: Article査読

57 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1027-1036
ページ数10
ジャーナルMacromolecular Chemistry and Physics
214
9
DOI
出版ステータスPublished - 2013 5月 14
外部発表はい

ASJC Scopus subject areas

  • 材料化学
  • ポリマーおよびプラスチック
  • 有機化学
  • 物理化学および理論化学
  • 凝縮系物理学

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