Brush polymer ion gels

Christopher M. Bates, Alice B Chang, Morgan W. Schulze, Nebojša Momčilovic, Simon C. Jones, Robert H. Grubbs

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The structure, rheological response, and ionic conductivity of ABA brush block copolymer (BBCP) ion gels containing 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMI][TFSI]) at polymer concentrations spanning 5-50 wt % (Φgel) were studied by small angle X-ray scattering, dynamic mechanical analysis, and AC impedance spectroscopy. Application of a hard sphere form factor and Percus-Yevick structure factor reveals trends in gel micellar structure as a function of BBCP molecular weight, A block volume fraction (ΦA), and Φgel. Viscoelastic properties are strongly dependent on end-block molar mass, with storage moduli ≤103 Pa at 25 °C. Impedance measurements reveal near liquid-like dynamics in the matrix phase as evidenced by conductivities near 1 mS/cm at 25 °C that decrease with increasing Φgel and ΦA.

Original languageEnglish (US)
Pages (from-to)292-300
Number of pages9
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume54
Issue number2
DOIs
StatePublished - Jan 15 2016
Externally publishedYes

Keywords

  • block polymer
  • brush polymer
  • ion gel
  • ionic liquid
  • scattering

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