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Formation and Stability of Soluble Stochiometric Polyelectrolyte Complexes: Effects of Charge Density and Polyelectrolyte Concentration
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface Chemistry.
2009 (English)In: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351, Vol. 30, no 6, 980-988 p.Article in journal (Refereed) Published
Abstract [en]

Sterically stabilized polyelectrolyte complexes with stoichiometric composition between oppositely charged synthetic polyelectrolytes carrying strong ionic groups and significantly different molecular weights have been prepared. Poly(sodium styrenesulfonate) (NaPSS) was used as polyanion and a range of brush copolymers with various molar ratio (X=1, 0.75, 0.5, 0.25) of the poly-methacryloxyethyl trimethylammonium chloride poly(METAC) and the nonionic poly(ethylene oxide) methyl ether methacrylate poly(PEO45MEMA) were used as polycations. Formation and stability of PECs have been investigated by dynamic and static light scattering (LS), turbidity and electrophoretic mobility measurements as a function of polyelectrolyte solution concentration and charge density of the cationic polyelectrolyte. The data obtained suggest that the PEO45- rich systems, NaPSS/PEO45MEMA:METAC-25 and NaPSS/PEO45MEMA:METAC-50, form small, water-soluble, molecular complexes having nonspherical shape. The PEO45-poor NaPSS/PEG45MEMA:METAC-75 form turbid colloidal dispersions, whereas insoluble PECs were revealed for the PEO45-free NaPSS/METAC system. The aggregation level of the PEO45-poor systems is mainly controlled by the concentration of the component solutions used for the preparation of PECs, whereas the aggregation of PEO45-rich nanoparticles is prevented by means of steric stabilization. Electrophoretic mobility data indicate a close to charge neutral state of the generated polyelectrolyte complexes.

Place, publisher, year, edition, pages
2009. Vol. 30, no 6, 980-988 p.
URN: urn:nbn:se:kth:diva-18459DOI: 10.1080/01932690802646512ISI: 000266436200029ScopusID: 2-s2.0-70449435311OAI: diva2:336506
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-05-16Bibliographically approved
In thesis
1. Polyelectrolyte complexes of bottle brush copolymers: Solution and adsorption properties
Open this publication in new window or tab >>Polyelectrolyte complexes of bottle brush copolymers: Solution and adsorption properties
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The aim of this thesis work was to systematically investigate the physico-chemical properties of polyelectrolyte complexes (PECs) formed by bottle brush and linear polyelectrolytes in solution and at solid / liquid interfaces. Electrostatic self-assembly of oppositely charged macromolecules in aqueous solution is a versatile strategy to construction of functional nanostructures with easily controlled properties. Bottle brush architecture, introduced into the PEC, generates a number of distinctive properties of the complexes, related to a broad range of application, such as colloidal stability and protein repellency to name a few. To utilize these materials in a wide range of applications e.g. drug delivery, the understanding of the effects of polymer architecture and solution parameters on the properties of bottle brush PECs is of paramount importance. This thesis constitutes a systematic investigation of PECs formed by a series of cationic bottle-brush polyelectrolytes and a series of anionic linear polyelectrolytes in aqueous solution. The focus of the first part of the thesis was primarily on formation and characterization of PECs in solution, whereas the adsorption properties and adsorption kinetics of bottle-brush polyelectrolytes and their complexes was investigated in the second part of the thesis work. In particular, effects of the side-chain density of the bottlebrush polyelectrolyte, concentration, mixing ratio and molecular weigh of the linearpolyelectrolyte on formation, solution properties, stability and adsorption of PECs were addressed.

The pronounced effect of the side-chain density of the bottle-brush polyelectrolyte on the properties of stoichiometric and nonstoichiometric PECs was demonstrated. Formation of PECs by bottle-brush copolymers with high density of side-chains results in small, watersoluble, molecular complexes having nonspherical shape, independent of concentration. Whereas formation of PEC-aggregates was revealed by bottle-brush polyelectrolytes with low side chain density, the level of aggregation in these complexes is controlled by polyelectrolyte concentration. The structure of the PECs formed with low molecular weight polyanions is consistent with the picture that several small linear polyelectrolyte molecules associate with the large bottle-brush. In contrast, when complexation occurs between polyanions of high molecular weigh and the bottle-brush polymers considerably larger PECs are formed, consistent with several bottle-brush polymers associating with one high molecular weight polyanion.

Place, publisher, year, edition, pages
Stockholm: KTH-Royal Institute of Technology, 2011. xiii, 62 p.
Trita-CHE-Report, ISSN 1654-1081 ; 2011:37
National Category
Physical Chemistry
urn:nbn:se:kth:diva-33666 (URN)978-91-7415-998-1 (ISBN)
Public defence
2011-06-01, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (Swedish)
Swedish Research Council
QC 20110516Available from: 2011-05-16 Created: 2011-05-13 Last updated: 2012-03-12Bibliographically approved

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