Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session D25: Rheology and Mechanics of Polymer Systems
3:00 PM–5:48 PM,
Monday, March 4, 2024
Room: 101F
Sponsoring
Unit:
DPOLY
Chair: Aman Agrawal
Abstract: D25.00006 : Structure, solubility and solution rheology of poly(ionic liquids)*
4:00 PM–4:12 PM
Presenter:
Carlos G Lopez
(Penn State University)
Authors:
Carlos G Lopez
(Penn State University)
Atsushi Matsumoto
(University of Fukui)
Takaichi Watanabe
(Okayama University)
For solvents with intermediate permitivitties (ε ≈17-30), the correlation length scales as ξ ∼ c-1/3, suggesting a partially collapsed (pearl necklace) conformation. We use the Dobyrnin-Rubinstein model to estimate mass per bead and bead volume fraction, establishing correlations with the solvent’s properties. In tetrahydrofuran (ε ≈ 8), the scattering and rheological behaviour matches that of neutral polymers.
The scaling model expects semidilute non-entangled solutions to follow Rouse dynamics. The specific viscosity (ηsp) is predicted to be equal to number of correlation blobs per chain (N/(cξ3)). We compute the ratio ηspcξ3 in several solvents and find that it does not take a constant value, in disagreement with the scaling model. Our results help establish a framework to understand the solution rheology of polymerised ionic liquids.
*DFG (GO 3250/2-1)
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