Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10529703 | Analytica Chimica Acta | 2005 | 8 Pages |
Abstract
Polyelectrolyte complex (PEC) formation between cationic poly(methacryloxyethyl trimethylammonium chloride) (PMOTAC) and anionic poly(ethylene oxide)-block-poly(sodium methacrylate) (PEO-b-PMANa) was studied by asymmetrical flow field-flow fractionation and dynamic light scattering. The influence of ionic strength and mixing ratios of the charged units of the polyelectrolytes on the complex formation was evaluated. The diffusion coefficients and the hydrodynamic diameter distributions of the free and complexed polyelectrolytes were measured. In the absence of salt, the weight averaged hydrodynamic diameters were 48 and 28Â nm for PMOTAC and PEO-b-PMANa, respectively. In the presence of salt, the particles were smaller, with weight averaged hydrodynamic diameters of 44-45 and 8-10Â nm, respectively. In salt-free solution, at 1:1 mixing ratio of the charged monomer units of PMOTAC and PEO-b-PMANa, polydisperse particles with diameters of 2000-4000Â nm were formed. In the presence of 20, 80, and 160Â mM of sodium chloride, the 1:1 complexes were relatively monodisperse particles with weight averaged hydrodynamic diameters of 93, 124, and 120Â nm, respectively.
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Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Gebrenegus Yohannes, Susanna Holappa, Susanne K. Wiedmer, Toni Andersson, Heikki Tenhu, Marja-Liisa Riekkola,