Volume 64, Number 2, October 2003
|Page(s)||204 - 210|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 November 2003|
Polyelectrolyte-like behaviour of poly(ethylene-oxide) solutions with added monovalent salt
Argonne National Laboratory, IPNS - Argonne,
IL 60439, USA
2 Tlemcen University, Faculty of Science, Physics Department B.P. 119, Tlemcen, 13000, Algeria
Corresponding author: email@example.com
Accepted: 8 August 2003
Solvent effects on the conformation of poly(ethylene-oxide) (PEO) and complexation of PEO by monovalent cations have been examined by using small-angle neutron scattering. In methanol and acetonitrile, a big change in interchain interaction, osmotic compressibility and local chain conformation have been observed upon addition of small amounts of potassium iodide. The amplitude of the total intensity decreases significantly and a peak at a certain value of the wave vector q* appears as signature of a polyelectrolyte-like behaviour. With further addition of salt, the ionic strength of the solution increases and potassium binding becomes less favorable: the binding constant decreases with the ionic strength and PEO behaves as a neutral polymer with excluded volume. No association between PEO and potassium iodide was observed in aqueous solutions.
PACS: 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 61.12.Ex – Neutron scattering (including small-angle scattering)
© EDP Sciences, 2003
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