Association of 4-n-Alkylbenzene Sulfonates with Hydrophobically Modified Poly (Diallyldimethylammonium) Chlorides

Rı́os, Hernán E.; Collío, Gonzalo A.; Leal, Matías; Urzúa, Marcela; Vargas, Vı́ctor

doi:10.1080/00222348.2012.737284

Cited by 2 publications

(6 citation statements)

References 21 publications

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“…The main objective is to establish if there is a dependence of b on the polyelectrolyte concentration, consistent with a conformational change as it can be assumed by the solution viscosity behavior of these macromolecules. 9 The b values here found are correlated with the behavior of the ratio (I 1 /I 3 ) of the fluorescence vibronic bands of pyrene, which have been widely used to evidence hydrophobic microdomains.…”

Section: (4)mentioning

confidence: 69%

“…Thus, according to equation 6, K can be calculated as: (9) Considering that the polyion radius a is 1.5×10 -8 cm, then Ka in equation 7 is: The relation between the fluorescence intensity vibronic bands of pyrene I 1 /I 3 was determined from the fluorescence spectra registered in the range 350 nm to 420 nm, using an excitation wave length of 330 nm with a spectral band width of 1.0 nm in the emission monocromator. The pyrene concentration was 2.0 µM.…”

Section: Methodsmentioning

confidence: 99%

“…9 The results are interpreted as a hypercoiling process of the alkylated derivatives due to the formation of hydrophobic microdomains produced by the interaction among non-polar aliphatic side chains. Unpublished results of electrical conductivity of their aqueous solutions suggest that the dissociation degree of these polyelectrolytes decreases when their side chains increases.…”

Section: (4)mentioning

confidence: 99%

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Intermolecular Association of Amphipathic Polyelectrolytes in Aqueous Solutions

Rı́os

Urzúa

Villalobos

et al. 2016

J. Chil. Chem. Soc.

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The intermolecular association of amphipathic polyelectrolytes is studied using fluorescence and conductivity methods. This type of interaction is evidenced by the decrease in the average distances between charges as the polyelectrolyte side chain increases in length. This modify the dissociation degree and consequently, the linear charge density parameter. These distances were calculated with the Manning counterion condensation theory for the conductivity of polyelectrolyte solutions. The determination of the ratio I 1 /I 3 of the fluorescence bands of pyrene with polymer content reveals the formation of hydrophobic microdomains at very low concentrations, smaller than the required concentration to produce a significant change in the average distances between charges. These distances and also the I 1 /I 3 ratio vary with polymer concentration and their values were dependent on the size of the side chain in the polyelectrolyte. Finally, the experimental behavior of the solution viscosity and electrical conductivity of polyelectrolytes, which increase drastically with dilution, can be explained as a continuous change in the average distances between charges which produce conformational changes.

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Section: (4)mentioning

confidence: 69%

Section: Methodsmentioning

confidence: 99%

Section: (4)mentioning

confidence: 99%

See 1 more Smart Citation

Intermolecular Association of Amphipathic Polyelectrolytes in Aqueous Solutions

Rı́os

Urzúa

Villalobos

et al. 2016

J. Chil. Chem. Soc.

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“…The u and K 0 values were obtained by fitting experimental data to the Satake-Yang's binding equation. [8] Alternatively to the Satake-Yang's model, the f values were plotted as a function of [X − w ] concentration and the curves fitted according to Hill's empirical equation, [9,10] …”

Section: Methodsmentioning

confidence: 99%

“…This assumption is supported by the viscosity measurements. [10] Effectively, the hydrodynamic volume of PC1 was shown to be very high as compared to those of the PCn polyelectrolytes, in a range 11-25 times greater, depending on the type of PCn polyelectrolyte. Thus, PC1 presents an extended conformation due to the electrostatic repulsion between charges on the polyion framework.…”

Section: Tablementioning

confidence: 98%

Binding of Phenols with Amphipathic Cationic Polyelectrolytes

Rı́os

Collío

Urzúa

et al. 2014

Journal of Macromolecular Science, Part B

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The association of phenols, such as p-cresol, tribromophenol, and trichlorophenol, with several amphipathic poly (n-alkylmethyldiallylammonium) chlorides in aqueous solution was studied by ultrafiltration. The n-alkyl residues were octyl, decyl, and dodecyl and the binding degrees were significantly higher than those found with the hydrophilic poly (diallyldimethylammonium) chloride. The results agreed well with the Satake and Yang's treatment and Hill's empirical equation for the association process, thereby revealing, in both cases, an increasing cooperative effect as the polyelectrolyte side chain increased in length for the same phenol, and when the hydrophobic nature of the phenol increased for the same kind of polyelectrolyte. From the phenomenological association constants, the estimated molar standard free energies of association ranged from −19 kJmol −1 , for the more hydrophilic phenoxide-polyelectrolyte pair, to −28 kJmol −1 for the more hydrophobic pairs. The main result is that the amphipathic nature of these polyelectrolytes makes them efficient systems to trap anionic contaminants, better than hydrophilic flocculants.

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Association of 4-n-Alkylbenzene Sulfonates with Hydrophobically Modified Poly (Diallyldimethylammonium) Chlorides

Cited by 2 publications

References 21 publications

Intermolecular Association of Amphipathic Polyelectrolytes in Aqueous Solutions

Intermolecular Association of Amphipathic Polyelectrolytes in Aqueous Solutions

Binding of Phenols with Amphipathic Cationic Polyelectrolytes

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