Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session F02: Polyelectrolyte Complexation I
11:30 AM–2:30 PM,
Tuesday, March 16, 2021
Sponsoring
Units:
DPOLY DSOFT
Chair: Samanvaya Srivastava, University of California; Debra Audus, National Institute of Standards of Technology
Abstract: F02.00008 : Associative Phase Separation in Polyelectrolyte Complex Coacervates
1:42 PM–1:54 PM
Live
Presenter:
Yuanchi Ma
(National Institute of Standards and Technology)
Authors:
Yuanchi Ma
(National Institute of Standards and Technology)
Vivek M Prabhu
(National Institute of Standards and Technology)
Samim Ali
(National Institute of Standards and Technology)
Yimin Mao
(National Institute of Standards and Technology)
Measurements on a common aqueous oppositely-charged polyelectrolyte complex, potassium-poly(styrene sulfonate) and poly(diallyl dimethyl ammonium bromide), shows liquid-liquid phase separation upon heating, or lower critical solution temperature behavior. The experimental accessibility of the apparent critical temperatures occurs for a narrow range of monovalent KBr salt concentration. We will show new static and dynamic light scattering and small-angle neutron scattering results and discuss how the correlation length, osmotic compressibility estimates from the scattered intensity to zero angle, and relaxation times change as the coexistence curve is approached by increasing temperature. The measurements of the binodal and spinodal curves from these polyelectrolyte solutions with chain association are compared to available models.
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