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Phase Diagram of Diblock Polyampholyte Solutions

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Institut Charles Sadron, 6 Rue Boussingault, 67083 Strasbourg Cedex, France; Physico-Chimie, Institut Curie, 11 Rue P. et M. Curie, 75231 Paris Cedex 05, France
Cite this: Macromolecules 2002, 35, 11, 4531–4538
Publication Date (Web):April 20, 2002
https://doi.org/10.1021/ma012097v
Copyright © 2002 American Chemical Society
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Abstract

We discuss in this paper the phase diagram of a diblock polyampholyte solution in the limit of high ionic strength as a function of concentration and charge asymmetry. This system is shown to be very similar to solutions of so-called charged-neutral diblock copolymers:  at zero charge asymmetry, the solution phase separates into a polyelectrolyte complex and almost pure solvent. Above a charge asymmetry threshold, the copolymers are soluble as finite size aggregates. Scaling laws of the aggregates radius as a function of pH of the solution are in qualitative agreement with experiments.

*

 Corresponding author. Present address:  Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, CA 90095.

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