Complexation and precipitation in polyampholyte solutions
Institut Charles Sadron (CNRS UPR022), 6 rue Boussingault, F-67083 Strasbourg Cedex, France
Accepted: 23 December 1996
We discuss multichain effects in polyampholyte solutions of finite concentration and find that the existing single-chain theories are limited to exponentially small concentrations, if the sample contains chains with net charges of both signs. We show that charged polyampholytes have a strong tendency to form neutral complexes and to precipitate. Stretched chains almost play no role in the ideal case of a neutral sample with nearly symmetric charge distribution. However, for a non-neutral sample, the free counterions accumulate in the supernatant together with charged, elongated chains and the behavior of the solution is dominated by “impurities”.
PACS: 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 64.75.+g – Solubility, segregation, and mixing; phase separation / 87.15.Da – Physical chemistry of solutions of biomolecules; condensed states
© EDP Sciences, 1997