Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 17, Issue 22, Pages 14872-14878Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp02033f
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Funding
- Australian Research Council [DP130102298, FT120100313]
- NSF [DMR-0520547]
- Australian Research Council [FT120100313] Funding Source: Australian Research Council
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The conformation of 38 kDa PEO in a solvate ionic liquid (SIL), lithium tetraglyme bis(trifluoromethanesulfonyl) 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 (R-g) 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.
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