Effect of Ionic Liquid Components on the Coil Dimensions of PEO

Kharel, Aakriti; Lodge, Timothy P.

doi:10.1021/acs.macromol.9b00354

Effect of Ionic Liquid Components on the Coil Dimensions of PEO

Journal Article · Fri Apr 12 00:00:00 EDT 2019 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.9b00354· OSTI ID:1523530

Kharel, Aakriti ^[1]; ^[1]

Univ. of Minnesota, Minneapolis, MN (United States)

Here, small-angle neutron scattering is used to measure the infinite dilution radius of gyration ($$R_{g,0}$$) for a range of molecular weights (10–250 kg/mol) of perdeuterated poly(ethylene oxide) (d-PEO) in various imidazolium-based ILs at 80 °C. The Flory exponents ($$\nu$$) evaluated in the ILs studied (1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][TFSI]), 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF₆]), and 1-hexyl-3-methylimidazolium tetrafluoroborate ([HMIM][BF₄])) lie between 0.58 and 0.60, indicating good solvent behavior. The coil dimensions of d-PEO increase on increasing the alkyl chain length of the cation and on decreasing the anion basicity. A more pronounced effect on coil dimensions is observed upon altering the anion, compared to the dependence on cation alkyl chain length. The temperature dependence of $$R_{g,0}$$ is found to be moderate in 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF₄]), where the coil size decreases upon increasing the temperature from 80 to 135 °C. Addition of up to 10 wt % of a salt, lithium bis(trifluoromethylsulfonyl)imide, to mixtures of d-PEO and [BMIM][TFSI] has no significant effect on $$R_{g,0}$$. These results are discussed in terms of the relative interactions among PEO, the cation, and the anion.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Science Foundation (NSF); Northwestern University; E.I. DuPont de Nemours & Co.; The Dow Chemical Company; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1523530

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 8 Vol. 52; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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