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 L15: Fantastic Polyelectrolytes and How They Behave in Coacervates
8:00 AM–11:00 AM,
Wednesday, March 17, 2021
Sponsoring
Unit:
DPOLY
Chair: Michael Rubinstein, Duke University Scott Danielsen, Duke University
Abstract: L15.00001 : Structure and Dynamics of Polyelectrolyte Solutions and Coacervates*
8:00 AM–8:36 AM
Live
Presenter:
Ralph Colby
(Pennsylvania State University)
Author:
Ralph Colby
(Pennsylvania State University)
The high viscosity glycerol solvent allows characterization of the viscoelastic response of high molecular weight polyelectrolytes over a wide range of frequency, showing Rouse character in unentangled solutions and a clear rubbery plateau in strongly entangled solutions. The linear viscoelastic response is identical to that of neutral polymer solutions, suggesting that entanglements are unaffected by the configuration of the chain inside the correlation length.
A simple way to make a polyampholyte gel is to mix oppositely charged polyelectrolytes, which precipitate to form a sediment that is termed a coacervate. Hydrophilic coacervates (with roughly 70 % water in them) are reversible gels with labile ionic interactions and their dynamics are described by a sticky Rouse model. In both examples, while not everything is understood for these complicated forms of condensed matter, polymer physics can be used to gain important insights.
*NSF Chemistry-1904852
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