Coacervate complex formation between cationic polyacrylamide and anionic sulfonated kraft lignin

Vanerek, Alois; Ven, Theo G. M. van de

doi:10.1016/j.colsurfa.2005.08.005

Cited by 29 publications

(23 citation statements)

References 22 publications

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“…Rigid polymers with uneven charge distribution, due to their inability to reconform, are more likely to form non-stoichiometric PEC. The presence of salt makes the polyelectrolytes form denser structures, which can lead to deviations from 1:1 stoichiometry (Vanerek and van de Ven, 2006). However, since the main driving force is the release of counterions, real deviations from 1:1 stoichiometry occur when the Debye length starts to be of the same order of magnitude as the distance between two charges along the chain of the polyelectrolyte with the lowest charge density.…”

Section: Determination Of the Amount Of Complexed Pahmentioning

confidence: 98%

Formation of Soft NanoparticlesviaPolyelectrolyte Complexation: A Viscometric Study

Rondon

Argillier

Moan

et al. 2014

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Nous avons aussi mesure´la viscosite´relative des suspensions; la fraction volumique des particules a pu eˆtre estime´e en faisant l'hypothe`se que la contribution des particules et du polycation en exce`s sont inde´pendantes. Nous avons pu e´tablir l'e´volution de la stoechiome´trie des PEC et de leur fraction volumique en fonction du ratio PAH/PSS dans le me´lange initial et du pH. Nos re´sultats montrent que l'accessibilite´des charges (conformation des chaines) de´termine a`la fois la stoechiome´trie et le niveau de compaction des complexes.Abstract -Formation of Soft Nanoparticles via Polyelectrolyte Complexation: A Viscometric Study -This paper describes the formation of soft nanoparticles resulting from electrostatically driven complexation of oppositely charged polyelectrolytes. The system was composed of a strong polyanion (PolyStyrene Sulfonate, PSS) and a weak polycation (Poly(Allylamine) Hydrochloride, PAH) in large excess. Soft nanoparticles were obtained by pouring a PSS solution into a PAH one under constant stirring. The PolyElectrolyte Complexes (PEC) were characterized through a viscometric study complemented by Dynamic Light Scattering (DLS), electrophoretic mobility and suspension turbidity measurements. PEC suspensions were centrifuged and by measuring the viscosity of the supernatant, we were able to estimate the free polycation concentration and hence the percentage of complexed polycation. We also measured the relative viscosity of the suspensions; from the estimated contribution of the PEC particles and of the polycation in excess, the average particle volume fraction was estimated. From all viscometric data, we could derive the evolution of the binding stoichiometry in PEC and of the effective particle volume fraction as a function of the mixing ratio (ratio of the cationic to anionic groups) and of the pH. Our results emphasize the importance of charge accessibility in controlling both the stoichiometry and packing density of the complexes.

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Section: Determination Of the Amount Of Complexed Pahmentioning

confidence: 98%

Formation of Soft NanoparticlesviaPolyelectrolyte Complexation: A Viscometric Study

Rondon

Argillier

Moan

et al. 2014

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…Effects of time on polyelectrolyte complexation have also been reported (Dautzenberg and Karibyants 1999;Phipps 1999;Naderi et al 2005;Hubbe 2006;Vanerek and van de Ven 2006). In practical terms this means that if one wants to achieve a certain state of cationic demand at the forming zone of a paper machine, then the amount of highly charged additive will have to be increased, in accordance with how far back in the system it has been added to the furnish (Strazdins 1972;Goossens and Luner 1976).…”

Section: Fiber Mesoporosity and Its Effects On Polyelectrolyte Permeamentioning

confidence: 99%

“…Willis et al (1987) reported molecular mass values for lignosulfonates in the range 11,000 to 61,000 g/mole. Vanerek and van de Ven (2006) found that such complexation led to coacervate formation, i.e. phase separation between polyelectrolyte-rich and poor phases.…”

Section: Lignin-related Contributors To Cationic Demandmentioning

confidence: 99%

“…Such deposition was promoted by the presence of calcium ions. Vanerek and van de Ven (2006) likewise showed that interaction between cationic polyacrylamide (i.e. a retention aid polymer) and sulfonated kraft lignin yielded coacervate complexes, the properties of which depended strongly on the mixing ratios and other experimental conditions.…”

Section: Deposit Control and Runnability Issuesmentioning

confidence: 99%

“…Some negatively charged species, which will be covered in more detail later, include fatty acids, resin acids, released hemicelluloses and pectins, and fragments of lignin. In addition, various processes related to sulfite pulping, as in chemi-thermomechanical pulp (CTMP) production, tend to produce sulfonate groups, which then contribute to the charge of the associated paper machine process waters (Ström et al 1979;Nyman and Rose 1986;Sjöström 1990;Zhang et al 1994;Vanerek et al 2006). When present in the colloidal material, the sulfonate groups provide a contribution of charge demand that is independent of pH.…”

Section: Wood As a Main Source Of Charge Demandmentioning

confidence: 99%

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Dissolved and Colloidal Substances (Dcs) and the Charge Demand of Papermaking Process Waters and Suspensions: A Review

et al. 2012

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Dissolved and colloidal substances (DCS) in the process waters of paper machine systems can interfere with the retention of fine particles, retard the drainage of water from the wet web, and generally hurt the intended functions of various polyelectrolytes that are added to the process. This review considers publications that have attempted to characterize the nature and effects of different DCS fractions, in addition to some of the ways that paper technologists have attempted to overcome related problems. The consequences of DCS in a paper machine system can be traced to their ability to form complexes with various polyelectrolytes. Such tendencies can be understood based on a relatively strong complexing ability of multivalent materials, depending on the macromolecular size and charge density. Continuing research is needed to more fully understand the different contributions to cationic demand in various paper machine systems and to find more efficient means of dealing with DCS.

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Polyelectrolyte complexation between poly(methacrylic acid, sodium salt) and poly(diallyldimethylammonium chloride) or poly[2‐(methacryloyloxyethyl) trimethylammonium chloride]

Burke

Mazumder

Hanna

et al. 2007

J. Polym. Sci. A Polym. Chem.

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Polyelectrolyte complexes between poly(methacrylic acid, sodium salt) and poly(diallyldimethylammonium chloride) (PDADMAC) or poly[2‐(methacryloyloxyethyl)trimethylammonium chloride] (PMOETAC) form gels, liquid phases, or soluble complexes depending on charge ratio, total polymer loading, polymer molecular weight, and ionic strength. Increasing the ionic strength of the medium led most polyelectrolyte pairs to transition from gel through liquid complexes (complex coacervate) to soluble complexes. These transitions shift to higher ionic strengths for higher molecular weight polymers, as well as for PMOETAC compared to PDADMAC. The complex phases swelled with increasing polymer loading, ultimately merging with the supernatant phase at a critical polymer loading. The isolated liquid complex phases below and above this critical loading were temperature‐sensitive, showing cloud points followed by macroscopic phase separation upon heating. Incorporating 5 mol % lauryl methacrylate into the polyanion led to increased complex yield with PDADMAC, and increased resistance to ionic strength. In contrast, incorporating 30 mol % of oligo(ethylene glycol) methacrylate into the polyanion led to decreased complex yield, and to lower resistance to ionic strength. Two polyelectrolyte systems that produced liquid complexes were used to encapsulate hydrophobic oils, and in one case were used to demonstrate the feasibility of crosslinking the resulting capsule walls. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 4129–4143, 2007

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Coacervate complex formation between cationic polyacrylamide and anionic sulfonated kraft lignin

Cited by 29 publications

References 22 publications

Formation of Soft NanoparticlesviaPolyelectrolyte Complexation: A Viscometric Study

Formation of Soft NanoparticlesviaPolyelectrolyte Complexation: A Viscometric Study

Dissolved and Colloidal Substances (Dcs) and the Charge Demand of Papermaking Process Waters and Suspensions: A Review

Polyelectrolyte complexation between poly(methacrylic acid, sodium salt) and poly(diallyldimethylammonium chloride) or poly[2‐(methacryloyloxyethyl) trimethylammonium chloride]

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