Title: Effect of polyion charge density on the morphology of nanostructures in polyelectrolyte-surfactant complexes
Authors: Kogej, K ×
Theunissen, E
Reynaers, Harry #
Issue Date: Jan-2002
Publisher: Amer chemical soc
Series Title: Langmuir vol:18 issue:23 pages:8799-8805
Abstract: The poly(acrylate) (PA)/surfactant and poly(methacrylic acid) (PMA)/surfactant complexes were investigated by synchrotron X-ray scattering at various degrees of neutralization, alpha, of the polyion and at a fixed surfactant to polyion charge ratio. At low alpha-values, the surfactant organizes into polymer-induced micelles that are attracted by the polymer through hydrophobic interactions. This is followed by a formation of a Pm3n cubic structure at higher alpha-values as a consequence of very strong electrostatic attractions between the polyion and charged surfactant aggregates. From the position of the maxima in the scattering curves, the characteristic distance d was obtained. In PA/surfactant complexes, d varies linearly with alpha. This is an indication of a smooth expansion of the PA chain upon neutralization. In PA/dodecylpyridinium chloride (DPC) solutions, d increases from 30.2 Angstrom at alpha = 0 to 36.6 Angstrom at alpha = 1, and correspondingly d increases from 44.1 to 51 Angstrom in the PA/CPC case. The d-value at alpha = 0 almost matches one micellar diameter, whereas the one at alpha = 1 exceeds this value by 6.4-7 Angstrom. This indicates that micelles induced by the polyion at alpha = 1 are separated by a layer of the charged polymer chain, whereas the polymer coil at alpha = 0 does not contribute significantly to the intermicellar distance. The distance d in PMA/surfactant solutions is not a linear function of a. A major increase in d is found in the range of a between 0.2 and 0.5. This agrees with the alpha-range in which the conformational transition of the PMA chain takes place.
ISSN: 0743-7463
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Chemistry - miscellaneous
× corresponding author
# (joint) last author

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