Coil Dimensions of Poly(ethylene oxide) in an Ionic Liquid by Small-Angle Neutron Scattering

Kharel, Aakriti; Lodge, Timothy P.

doi:10.1021/acs.macromol.7b02014

Title: Coil Dimensions of Poly(ethylene oxide) in an Ionic Liquid by Small-Angle Neutron Scattering

Journal Article · Wed Nov 01 00:00:00 EDT 2017 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.7b02014· OSTI ID:1422229

Kharel, Aakriti ^[1];

^[1]

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

In this work, the infinite dilution radii of gyration (R_g,0) for five different molecular weights (10–250 kg/mol) of perdeuterated poly(ethylene oxide) (d-PEO) have been determined at 80 °C in the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF₄]) using small-angle neutron scattering (SANS). The results establish the dependence of R_g,0 on polymer molecular weight as R_g,0 ~ M_w^0.55. An excluded volume exponent of ν ≈ 0.55 indicates that [BMIM][BF₄] is a moderately good solvent and that PEO remains a flexible random coil in this ionic liquid. These results clarify the uncertainty surrounding PEO coil dimensions in this ionic liquid, as computer simulations at various levels of complexity have led to conflicting results, and prior experimental results also do not present a completely consistent picture.

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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)

Grant/Contract Number:: AC02-06CH11357; 0960140

OSTI ID:: 1422229

Journal Information:: Macromolecules, Vol. 50, Issue 21; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 23 works

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Title: Coil Dimensions of Poly(ethylene oxide) in an Ionic Liquid by Small-Angle Neutron Scattering

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