Structure and Dynamics in Multicomponent Polyelectrolyte Solutions

Published

March 11, 2008

Author(s)

Sanghun Lee, Vijay Tirumala, Michihiro Nagao, Taiki Tominaga, Eric K. Lin, Jian P. Gong, Wen-Li Wu

Abstract

Double-network hydrogels (DN-gels) prepared from the combination of a moderately crosslinked anionic polyelectrolyte (poly(2-acrylamido-2-methyl-1-propanesulfonic acid, PAMPS) and an uncrosslinked linear polymer (polyacrylamide, PAAm) solution show strong mechanical properties far superior to that of their individual constituents. To understand the extraordinarily tough strength of DN-gels, we investigated structures and dynamics of the model solutions of PAMPS/PAAm blends using small angle neutron scattering and neutron spin echo measurements. Akcasu's dynamic scattering theory for multicomponent system is modified for polyelectrolyte solutions and the resultant equation describes well the neutron spin echo results over the entire experimental q range, useful parameters including the effective solvent viscosity can be deduced using the modified Akcasu's equation. Both the relaxation time at the large length scale and the segmental diffusion coefficient at the short length scale or the effective solvent viscosity show good accordance with the rheological behaviors of the solution blends.

Citation

Macromolecules

Pub Type

Journals

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Keywords

polyelectrolytes, chain dynamics, polymer solution blends, neutron spin echo, hydrodynamic interaction, random phase approximation

Citation

Lee, S. , Tirumala, V. , Nagao, M. , Tominaga, T. , Lin, E. , Gong, J. and Wu, W. (2008), Structure and Dynamics in Multicomponent Polyelectrolyte Solutions, Macromolecules, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=854453 (Accessed December 26, 2024)