TY - JOUR
T1 - Conformation of poly(ethylene oxide) dissolved in ethylammonium nitrate
AU - Werzer, Oliver
AU - Warr, Gregory G.
AU - Atkin, Rob
PY - 2011
Y1 - 2011
N2 - Small angle neutron scattering has been used to investigate the morphology of 38 kDa PEO dissolved in ethylammonium nitrate (EAN) in the dilute and semidilute concentration regions. At infinite dilution, the radius of gyration, Rg, is 8.1 nm. This value decreases through the dilute regime according to a concentration (c) dependence of Rg ≈ c-0.24, while above the overlap concentration a c-1 dependence is followed. These values differ from aqueous solution behavior, which we attribute to EAN being a poorer solvent for PEO than water; EAN is in fact close to a θ solvent. The polymer structure on length scales less than 3 nm is unaffected by increasing polymer concentration, suggesting that the overall decrease in coil dimensions is a consequence of tighter packing of ∼3 nm polymer "blobs" into a smaller volume.
AB - Small angle neutron scattering has been used to investigate the morphology of 38 kDa PEO dissolved in ethylammonium nitrate (EAN) in the dilute and semidilute concentration regions. At infinite dilution, the radius of gyration, Rg, is 8.1 nm. This value decreases through the dilute regime according to a concentration (c) dependence of Rg ≈ c-0.24, while above the overlap concentration a c-1 dependence is followed. These values differ from aqueous solution behavior, which we attribute to EAN being a poorer solvent for PEO than water; EAN is in fact close to a θ solvent. The polymer structure on length scales less than 3 nm is unaffected by increasing polymer concentration, suggesting that the overall decrease in coil dimensions is a consequence of tighter packing of ∼3 nm polymer "blobs" into a smaller volume.
UR - http://www.scopus.com/inward/record.url?scp=79952096238&partnerID=8YFLogxK
U2 - 10.1021/jp110216k
DO - 10.1021/jp110216k
M3 - Article
AN - SCOPUS:79952096238
VL - 115
SP - 648
EP - 652
JO - The Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical
JF - The Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical
SN - 1520-5207
IS - 4
ER -