Synthesis of Linear and Crosslinked Polyampholytes

Kudaibergenov, Sarkyt E.

doi:10.1007/978-1-4615-0627-0_1

Cited by 3 publications

(3 citation statements)

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“…Charged polymers containing ionizable groups can dissolve in polar solvents, leaving charged monomers on polymer backbone and releasing counterions into solution. They are classified into polyelectrolytes when the polymers carry either cationic or anionic monomers and as polyampholytes when the polymers are capable of carrying both positive and negative charges on the same chain. − Many charged polymers found in nature, including proteins, are in fact polyampholytes. Depending on the different dissociation behavior one can distinguish between weak (also known as annealed) and strong (also known as quenched) polyelectrolytes .…”

Section: Introductionmentioning

confidence: 99%

Complexation Behavior of Polyelectrolytes and Polyampholytes

2017

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We perform grand canonical Monte Carlo simulations to study the pH titrations of isolated polyampholytes and polyelectrolyte-polyampholyte complexes in dilute solutions. Our simulations indicate that the electrostatic interactions promote the coexistence of opposite charges along the polyampholyte chain during titration. The repulsion between excess charges typically dominates the electrostatic interaction and leads to polymer stretching. Salt ions can screen the repulsion between excess charges as well as the fluctuation-induced attraction between opposite charges, and therefore make the variation between titration curves of polyampholytes and the ideal (no electrostatic interactions) curves less significant. We observe that this screening of charge repulsion decreases the chain size. The presence of pearl-necklace configuration of polyampholytes is diminished by the addition of salt. Similar simulations for the polyelectrolyte-polyampholyte system show that the resulting complexes are generally stable in the low pH region. In comparison to ideal case, electrostatic interactions strongly influence the acid-base properties of polyampholyte chains in the adsorbed state by reducing the presence of the coexistence domain of both positive and negative charges in the titration curves. We attribute the complex formation between polyelectrolyte and polyampholyte chains in the high pH region to, e.g., the high salt content. The pH variation leads to abrupt transition between adsorbed and desorbed states. Independent of charge sequence, a polyampholyte chain in a complex is usually located at one of the ends of the polyelectrolyte chain.

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Section: Introductionmentioning

confidence: 99%

Complexation Behavior of Polyelectrolytes and Polyampholytes

2017

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“…One principal advantage of polyampholytes is that their association and stabilization behavior can be easily regulated by adjusting solution pH. This leads to many potential applications 5 and considerable interest in experimental, [33][34][35][36][37][38][39][40] theoretical, 2, 28, 41-45 and simulation [46][47][48][49][50][51][52][53][54][55][56] studies of polyampholytes. The conductivity, viscosity, as well as coil size of random polyampholytes have a minimum at the isoelectric conditions where there are equal numbers of positive and negative charges on the polymer backbone.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, polyelectrolytes and polyampholytes have received considerable interest especially because of their importance in biology, materials science, and soft matter research. 5,6 Depending on the different dissociation behavior one can distinguish between weak and strong polyelectrolytes, a classification widely used in the chemistry community, 1 or between annealed and quenched polyelectrolytes, the common classification of the same polymers used in the physics community. 7 Weak or annealed polyelectrolytes, for example, poly(acrylic acid), dissociate in a limited pH range only.…”

Section: Introductionmentioning

confidence: 99%

Conformational transitions of a weak polyampholyte

Nair

Uyaver

Sun

2014

The Journal of Chemical Physics

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Complexation of copper(II) ions with imidazole–carboxylic polymeric systems

Annenkov

Danilovtseva

Saraev

et al. 2003

J. Polym. Sci. A Polym. Chem.

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The interaction of two polyampholyte systems, poly(1-vinylimidazole-coacrylic acid) and interpolymer complex poly(acrylic acid)/poly(1-vinylimidazole) with copper(II) ions in water, was examined with potentiometry (pH-metry and Cu-selective electrode) and electron spin-resonance spectroscopy. Coordination of Cu 2ϩ with copolymer proceeded by carboxylic groups, whereas the interpolymer system azole units were also involved in the inner sphere of the complex. Synergism between coordination with metal ions and intramolecular hydrogen or ionic bonds was shown. The interpolymer complex was an effective system for binding, extracting, and concentrating copper ions from water.

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Synthesis of Linear and Crosslinked Polyampholytes

Cited by 3 publications

References 100 publications

Complexation Behavior of Polyelectrolytes and Polyampholytes

Complexation Behavior of Polyelectrolytes and Polyampholytes

Conformational transitions of a weak polyampholyte

Complexation of copper(II) ions with imidazole–carboxylic polymeric systems

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