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Lower critical solution temperature in polyelectrolyte coacervates



Samim Ali, Markus Bleuel, Vivek Prabhu


Model linear oppositely-charged polyelectrolyte complexes exhibit a lower critical solution temperature. The coexist-ence curves narrow with increasing monovalent salt concentration (Cs) that lowers the polymer concentration (Cp) in the polymer-rich phase, consistent with expectations from studies on the Cs-Cp plane. The experimental accessibility of the apparent critical temperature occurs for a narrow range of Cs. Complementary cloud point measurements appear to track the polymer-rich branch of the phase diagram. Comparisons to available models suggest that the enthalpic contribution to the free energy density via the solvophobic polymer- solvent interaction parameter are required to reconcile these new data.
ACS Macro Letters


polyelectrolyte phase diagram, coexistence curve, laser light scattering, cloud point


Ali, S. , Bleuel, M. and Prabhu, V. (2019), Lower critical solution temperature in polyelectrolyte coacervates, ACS Macro Letters, [online], (Accessed April 19, 2024)
Created February 25, 2019, Updated October 12, 2021