Chain Dynamics in a Polyelectrolyte Solution Under Shear: A Rheological NMR Investigation

• Published in: Applied magnetic resonance Vol. 54; no. 11-12; pp. 1533 - 1541
• Main Authors: Bartosch, Sascha, Kohn, Benjamin, Scheler, Ulrich
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01-12-2023; Springer Nature B.V
• Subjects: Atoms and Molecules in Strong Fields; Chain dynamics; Experiments; Fourier transforms; Laser Matter Interaction; Molecular weight; NMR; Nuclear magnetic resonance; Organic Chemistry; Original Paper; Phase transitions; Physical Chemistry; Physics; Physics and Astronomy; Polyelectrolytes; Polymer melts; Polymers; Rheological properties; Rheology; Signal to noise ratio; Sodium; Solid State Physics; Spectroscopy/Spectrometry
• ISSN: 0937-9347; 1613-7507
• DOI: 10.1007/s00723-023-01598-9

Rheological nuclear magnetic resonance (NMR) has been applied to study the effect of shear on the chain dynamics in a solution of a linear poly(sodium 4-styrenesulfonate). Information on the chain dynamics of poly(sodium 4-styrenesulfonate) sheared in a narrow-gap concentric double cylinder cell is inferred from the NMR transverse relaxation
T
2
for a concentration in the semidilute-entangled and in the concentrated regime. In the semidilute-entangled concentration enhanced relaxation is observed. In the concentrated regime signatures of a loss of entanglements are seen with increasing
T
2
and a decreasing fraction of the polymer showing restricted motion. The effect is enhanced when the electrostatic interaction along the polymer chain is reduced by the addition of NaCl.