Conformation of poly(ethylene oxide) dissolved in the solvate ionic liquid [Li(G4)]TFSI

Zhengfei Chen, Paul A. FitzGerald, Gregory G. Warr, Rob Atkin

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


The conformation of 38 kDa PEO in a solvate ionic liquid (SIL), lithium tetraglyme bis(trifluoromethane-sulfonyl)amide ([Li(G4)]TFSI) from dilute to concentrated solution regimes has been determined by small angle neutron scattering and rheology. SANS analysis reveals that [Li(G4)]TFSI is better than a theta solvent (theta-good) for PEO. The variation of the radius of gyration (Rg) and viscosity as a function of polymer concentration allow the overlap concentrations, c∗ and c∗∗, to be identified at 13 mg mL-1 and 50 mg mL-1, respectively, which are similar to values reported previously for conventional ionic liquids. Unlike water and conventional ionic liquids, [Li(G4)]TFSI cannot form hydrogen bonds with PEO. Thermal gravimetric analysis indicates that the solvation of PEO by [Li(G4)]TFSI is a consequence of PEO forming coordinate bonds with the lithium by displacing the anion, but without displacing the glyme molecule.

Original languageEnglish
Pages (from-to)14872-14878
Number of pages7
JournalPhysical Chemistry Chemical Physics
Issue number22
Publication statusPublished - 14 Jun 2015
Externally publishedYes


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