Structure and mechanism formation of polyelectrolyte complex obtained from PSS/PAH system: effect of molar mixing ratio, base–acid conditions, and ionic strength

Márquez‐Beltrán, César; Castañeda, L.; Enciso-Aguilar, M.; Paredes-Quijada, Gerardo; Acuña-Campa, Heriberto; Maldonado-Arce, Amir; Argillier, Jean-François

doi:10.1007/s00396-012-2775-y

Cited by 27 publications

(13 citation statements)

References 31 publications

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“…In the case of polyelectrolyte complexation, the electrostatic interaction plays a key role for understanding these phenomena. It has been found 29 that the formation of the complex depends on several factors such as chain size, charge distribution on the polyelectrolyte, ionic strength, pH, solvent type and thermal energy. A very simplified model which serves as a reference system to study the complex formation is the ideal case of two single polyelectrolytes of opposite charge in solution. Previous simulations studies of two single polyelectrolytes were preformed using Brownian dynamics simulations to explore the formation of their complex 24,30 .…”

Section: Introductionmentioning

confidence: 99%

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The structure and interaction mechanism of a polyelectrolyte complex: a dissipative particle dynamics study

et al. 2015

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The mechanism of complex formation of two oppositely charged linear polyelectrolytes dispersed in a solvent is investigated by using dissipative particle dynamics (DPD) simulation. In the polyelectrolyte solution, the size of the cationic polyelectrolyte remains constant while the size of the anionic chain increases. We analyze the influence of the anionic polyelectrolyte size and salt effect (ionic strength) on the conformational changes of the chains during complex formation. The behavior of the radial distribution function, the end-to-end distance and the radius of gyration of each polyelectrolyte is examined. These results showed that the effectiveness of complex formation is strongly influenced by the process of counterion release from the polyelectrolyte chains. The radius of gyration of the complex is estimated using the Fox-Flory equation for a wormlike polymer in a theta solvent. The addition of salts in the medium accelerates the complex formation process, affecting its radius of gyration. Depending on the ratio of chain lengths a compact complex or a loosely bound elongated structure can be formed.

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Section: Introductionmentioning

confidence: 99%

“…Recently colloidal dispersions of polyelectrolyte complexes of sodium polystyrene sulfonate and polyallylamine hydrochloride were prepared in aqueous solutions, finding that the effect of the ionic strength affects the size and stability of the complex formation 29 .…”

Section: Introductionmentioning

confidence: 99%

The structure and interaction mechanism of a polyelectrolyte complex: a dissipative particle dynamics study

et al. 2015

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“…polymer structure and charge density) and external parameters including polyelectrolyte concentration, polyanion/polycation mixing ratio, mixing order, salt type, salt concentration, and solution pH (for weak polyelectrolytes). 8,[16][17][18][19][20][21][22][23] The resulting structure may be solid-like (complex solid) or liquid-like (complex coacervate). [24][25][26] Many prior investigations have focused upon the effects of mixing ratio, ionic strength, and other external parameters on the formation or response of PECs, usually at a fixed point in time.…”

Section: Introductionmentioning

confidence: 99%

The influence of ionic strength and mixing ratio on the colloidal stability of PDAC/PSS polyelectrolyte complexes

et al. 2015

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Polyelectrolyte complexes (PECs) form by mixing polycation and polyanion solutions together, and have been explored for a variety of applications. One challenge for PEC processing and application is that under certain conditions the as-formed PECs aggregate and precipitate out of suspension over the course of minutes to days. This aggregation is governed by several factors such as electrostatic repulsion, van der Waals attractions, and hydrophobic interactions. In this work, we explore the boundary between colloidally stable and unstable complexes as it is influenced by polycation/polyanion mixing ratio and ionic strength. The polymers examined are poly(diallyldimethylammonium chloride) (PDAC) and poly(sodium 4-styrenesulfonate) (PSS). Physical properties such as turbidity, hydrodynamic size, and zeta potential are investigated upon complex formation. We also perform detailed molecular dynamics simulations to examine the structure and effective charge distribution of the PECs at varying mixing ratios and salt concentrations to support the experimental findings. The results suggest that the colloidally stable/unstable boundary possibly marks the screening effects from added salt, resulting in weakly charged complexes that aggregate. At higher salt concentrations, the complexes initially form and then gradually dissolve into solution.

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“…Chitosan as a cationic polysaccharide is typically used since it has a positive charge at pH below 6.5, making it favorable to form PEC with other anionic polymers [15]. The positive and negative charged polymers interact spontaneously and create a colloidal suspension [16]. The structure produced from the electrostatic attractions is influenced by the ratio of cationic and anionic functional groups, which determine the characteristics of PEC, whether it is soluble or insoluble [14].…”

Section: The Mechanism Of Gum As Hydrocolloid Pecmentioning

confidence: 99%

A Review of Gum Hydrocolloid Polyelectrolyte Complexes (PEC) for Biomedical Applications: Their Properties and Drug Delivery Studies

et al. 2021

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The utilization of natural gum polysaccharides as the vehicle for drug delivery systems and other biomedical applications has increased in recent decades. Their biocompatibility, biodegradability, and price are much cheaper than other materials. It is also renewable and available in massive amounts, which are the main reasons for its use in pharmaceutical applications. Gum can be easily functionalized with other natural polymers to enhance their applications. Various aspects of the utilization of natural gums in the forms of polyelectrolyte complexes (PECs) for drug delivery systems are discussed in this review. The application of different mathematical models were used to represent the drug release mechanisms from PECs; these models include a zero-order equation, first-order equation, Higuchi, simplified Higuchi, Korsmeyer–Peppas, and Peppas–Sahlin.

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Structure and mechanism formation of polyelectrolyte complex obtained from PSS/PAH system: effect of molar mixing ratio, base–acid conditions, and ionic strength

Cited by 27 publications

References 31 publications

The structure and interaction mechanism of a polyelectrolyte complex: a dissipative particle dynamics study

The structure and interaction mechanism of a polyelectrolyte complex: a dissipative particle dynamics study

The influence of ionic strength and mixing ratio on the colloidal stability of PDAC/PSS polyelectrolyte complexes

A Review of Gum Hydrocolloid Polyelectrolyte Complexes (PEC) for Biomedical Applications: Their Properties and Drug Delivery Studies

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