Studies of Ion Conductance in Polymers Derived from Norbornene Imidazolium Salts Containing Ethyleneoxy Moieties

Terry L. Price, U. Hyeok Choi, Daniel V. Schoonover, Dong Wang, James R. Heflin, Renxuan Xie, Ralph H. Colby, Harry W. Gibson

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Abstract

"Two-armed" imidazolium polymers 2a-2f, most of which contain oxyethylene moieties as linkers and ethyleneoxy terminal units, were prepared via ROMP. These polymers were thermally stable, with 5% weight losses occurring at 350 ± 5 °C under nitrogen. Their glass transitions were -22 to -51 °C, mostly ∼3 °C higher than those of the respective monomers. The conductivities of the polymers were 4-30-fold lower than those of the respective monomers. The maximum room temperature (RT) conductivity, σ 25 = 2.27 × 10 -5 S/cm, was observed with the polymer 2f with a tetra(oxyethylene) linker (X = 4) and a terminal di(ethyleneoxy) unit (Y = 2). Reduction of the double bonds in polymers 2 resulted in only small changes in T g of the resultant 3 but 2.4-fold loss in RT conductivities. Four "one-armed" norbornene imidazolium TFSI monomers via ROMP produced polymers 5, whose T g s were generally low (-50 to -65 °C) and very close to those of the monomers. Although the RT conductivities were reduced by about an order of magnitude from the monomers, the polymers with tetra(oxyethylene) linkers (X = 4) and di- and triethyleneoxy terminal units (Y = 2 or 3) (5c and 5d) had σ 25 ∼ 3 × 10 -5 S/cm, similar to the best two-armed polymer. Two ABA triblock copolymers 8 were successfully synthesized from norbornene-N-phenylimide and two-armed monomers with different terminal ethyleneoxy units (1d and 1e); these polymers demonstrated single direction actuation, but their performance was mediocre because of phase mixing that prevented the formation of the required bicontinuous phase morphology.

Original languageEnglish (US)
Pages (from-to)1389-1399
Number of pages11
JournalMacromolecules
Volume52
Issue number4
DOIs
StatePublished - Feb 26 2019

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All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Price, T. L., Choi, U. H., Schoonover, D. V., Wang, D., Heflin, J. R., Xie, R., Colby, R. H., & Gibson, H. W. (2019). Studies of Ion Conductance in Polymers Derived from Norbornene Imidazolium Salts Containing Ethyleneoxy Moieties. Macromolecules, 52(4), 1389-1399. https://doi.org/10.1021/acs.macromol.8b02303