2007
DOI: 10.1021/jp071655q
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Dependency of Particle Sizes and Colloidal Stability of Polyelectrolyte Complex Dispersions on Polyanion Structure and Preparation Mode Investigated by Dynamic Light Scattering and Atomic Force Microscopy

Abstract: Polyelectrolyte complex (PEC) dispersions were prepared by controlled mixing of three random copolymers of sodium 2-acrylamido-2-methylpropanesulfonate (AMPS) with either t-butyl acrylamide (TBA) [P(AMPS54-co-TBA46) and P(AMPS37-co-TBA63)] or methyl methacrylate (MM) [P(AMPS52-co-MM48)] with an ionene-type polycation, containing 95 mol % N,N-dimethyl-2-hydroxypropyleneammonium chloride repeat units (PCA5), with their structural characteristics being deeply investigated by dynamic light scattering (DLS) and ato… Show more

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Cited by 22 publications
(31 citation statements)
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“…The PECs of chitosan attract attention due to the possibility of tuning the pH sensitive behavior of the prepared materials by changing the nature of the polyacid and the medium conditions (pH, presence of low molecular weight salt) 15, 16. It is known that, depending on the conditions, the preparation of macro‐, micro‐ and nanosized PEC‐based materials is feasible 15, 17, 18. Composite fibers of PEC chitosan/poly(acrylic acid) (PAA) with average diameters of 40–100 µm have been prepared using polyion complex formation between chitosan and PAA at the interface of chitosan and PAA aqueous solutions 19.…”
Section: Introductionmentioning
confidence: 99%
“…The PECs of chitosan attract attention due to the possibility of tuning the pH sensitive behavior of the prepared materials by changing the nature of the polyacid and the medium conditions (pH, presence of low molecular weight salt) 15, 16. It is known that, depending on the conditions, the preparation of macro‐, micro‐ and nanosized PEC‐based materials is feasible 15, 17, 18. Composite fibers of PEC chitosan/poly(acrylic acid) (PAA) with average diameters of 40–100 µm have been prepared using polyion complex formation between chitosan and PAA at the interface of chitosan and PAA aqueous solutions 19.…”
Section: Introductionmentioning
confidence: 99%
“…Mihai et al [7] investigated, amongst other factors, the size and shape of polyelectrolyte complexes of random copolymers of sodium 2-acrylamido-2-methylpropanesulfonate with either t-butyl acrylamide or methyl methacrylate with an ionene-type polycation by dynamic light scattering and AFM. It was found, that the mean particle sizes of the complex nanoparticles, measured by AFM, were close but always lower than those measured by DLS.…”
Section: Introductionmentioning
confidence: 99%
“…A very important characteristic of the PECs as colloidal dispersion is their colloidal stability. Storage colloidal stability of PECs is very sensitive to the structure of the complementary polyions, to the molar ratio between charges, i.e., the complex is closer or further to the molar ratio (n -/n + ) n , to the polyions addition order, especially when the complementarities of oppositely charged polyions is disturbed by their structure, and very much to the titrant addition rate, as it was previously demonstrated for PECs prepared with strong polyanions [31][32][33]. Therefore, the particle sizes, D h , measured after 24 h from preparation were compared with those measured after two weeks of storage at room temperature (~22°C), without stirring (data not shown here).…”
Section: Colloidal Stabilitymentioning
confidence: 74%
“…The polyanion solution was added dropwise to the polycation solution, under magnetic stirring. A constant addition rate of 3.8 ml polyanion/ (ml polycation"h) was used as optimum addition rate, taking into account the complex morphology and the preparation speed, according to our previous investigations on the formation of PECs as colloidal dispersion from synthetic polycations and polyanions [30][31][32][33]. After mixing, the formed dispersions were stirred 60 min and were characterized after 24 h, if other conditions were not specified.…”
Section: Preparation Of Polyelectrolyte Complexesmentioning
confidence: 99%
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