scholarly journals Weak polyelectrolyte brushes: re-entrant swelling and self-organization

Soft Matter ◽  
2020 ◽  
Vol 16 (33) ◽  
pp. 7727-7738
Author(s):  
Vincent Senechal ◽  
Hassan Saadaoui ◽  
Nelson Vargas-Alfredo ◽  
Juan Rodriguez-Hernandez ◽  
Carlos Drummond
Keyword(s):  
Ionic Strength ◽  
Acrylic Acid ◽  
Charge Density ◽  
Self Organization ◽  
Polyelectrolyte Brushes ◽  
Influence Of Ph ◽  
Poly Acrylic Acid

We have studied the influence of pH and ionic strength on brushes of poly(acrylic acid) at grafting densities close to the mushroom-brush crossover. Heterogeneous morphology and non-monotonous variation of charge density with pH were observed.

Determination of the complexation properties of a crosslinked poly(acrylic acid) gel with copper(II), nickel(II), and lead(II) in dilute aqueous solution

2001 ◽  
Vol 79 (4) ◽  
pp. 370-376 ◽  
Author(s):  
Catherine Morlay ◽  
Yolande Mouginot ◽  
Monique Cromer ◽  
Olivier Vittori
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Acrylic Acid ◽  
Metal Ion ◽  
Conditional Stability ◽  
Binding Properties ◽  
Complex Species ◽  
Complexing Capacity ◽  
Dilute Aqueous Solution ◽  
Poly Acrylic Acid

The possible removal of copper(II), nickel(II), or lead(II) by an insoluble crosslinked poly(acrylic acid) was investigated in dilute aqueous solution. The binding properties of the polymer were examined at pH = 6.0 or 4.0 with an ionic strength of the medium µ = 0.1 or 1.0 M (NaNO3) using differential pulse polarography as an investigation means. The highest complexing capacity of the polyacid was obtained with lead(II) at pH = 6.0 with µ = 0.1 M, 4.8 mmol Pb(II)/g polymer. The conditional stability constants of the complex species formed were determined using the method proposed by Ruzic assuming that only the 1:1 complex species was formed; for lead(II) at pH = 6.0 and µ = 0.1 M, log K' = 5.3 ± 0.2. It appeared that the binding properties of the polymer increased, depending on the metal ion, in the following order: Ni(II) < Cu(II) < Pb(II). The complexing capacity and log K' values decreased with the pH or with an increase of the ionic strength. These results were in agreement with the conclusions of our previous studies of the hydrosoluble linear analogues. Finally, with the insoluble polymer, the log K' values were comparable to those previously obtained with the linear analogue whereas the complexing capacity values expressed in mmol g-1 were slightly lower.Key words: insoluble crosslinked poly(acrylic acid), copper(II), nickel(II), and lead(II) complexation.

Structure and swelling of poly(acrylic acid) hydrogels: effect of pH, ionic strength, and dilution on the crosslinked polymer structure

Polymer ◽  
2004 ◽  
Vol 45 (5) ◽  
pp. 1503-1510 ◽  
Author(s):  
Jeannine E. Elliott ◽  
Mara Macdonald ◽  
Jun Nie ◽  
Christopher N. Bowman
Keyword(s):  
Ionic Strength ◽  
Acrylic Acid ◽  
Polymer Structure ◽  
Effect Of Ph ◽  
Crosslinked Polymer ◽  
Poly Acrylic Acid

scholarly journals Hydrophobically Functionalized Poly(Acrylic Acid) Comprising the Ester-Type Labile Spacer: Synthesis and Self-Organization in Water

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1185
Author(s):  
Łukasz Lamch ◽  
Sylwia Ronka ◽  
Izabela Moszyńska ◽  
Piotr Warszyński ◽  
Kazimiera A. Wilk
Keyword(s):  
Acrylic Acid ◽  
Self Assembly ◽  
Strong Dependence ◽  
Chemical Degradation ◽  
Self Organization ◽  
Hydrodynamic Diameter ◽  
Crucial Information ◽  
Dynamics Simulations ◽  
Chain Lengths ◽  
Poly Acrylic Acid

One of the most important properties of hydrophobically functionalized polyelectrolytes (HF-PEs) and their assemblies is their ability to encapsulate hydrophobic/amphiphilic agents and provide release on demand of the entrapped payload. The aim of the present work was to synthesize and study self-organization behavior in aqueous solution of hydrophobically functionalized poly(acrylic acid) (PAA) comprising the ester-type pH labile moiety with various degrees of hydrophobization and side-chain lengths in the absence and presence of appropriate mono- and polyvalent electrolytes (i.e., NaCl or CaCl2). The synthesis and purification of hydrophobically functionalized PAA were performed under mild conditions in order to avoid chemical degradation of the polymers. The modified polyelectrolytes self-assembly in aqueous systems was monitored using diffusion-ordered nuclear magnetic resonance (DOSY NMR). The performed studies, supported by the all-atoms molecular dynamics simulations, revealed a strong dependence of polyelectrolyte self-assembled state on concentration—specific concentration regions with the coexistence of both smaller and larger aggregates were observed (values of hydrodynamic diameter DH around one nanometer and between two to six nanometers, respectively). Our investigations enabled us to gain crucial information about the self-assembly of the hydrophobically functionalized poly(acrylic acid) and opened the possibility of understanding and predicting its performance under various conditions.

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