Issue 6, 2006
From the journal:

Soft Matter

pH-Tunable rheological properties of a telechelic cationic polyelectrolyte reversible hydrogel

Frédéric Bossard,a   Thierry Aubry,a   Georgios Gotzamanisb  and  Constantinos Tsitsilianis*b  

* Corresponding authors

a Laboratoire de Rhéologie, 6 avenue Le Gorgeu - CS93837, 29238 Brest Cedex 3, France

b Department of Chemical Engineering, University of Patras 26504, Patras Greece and Institute of Chemical Engineering and High Temperature Chemical Processes, FORTH/ICE-HT
E-mail: ct@chemeng.upatras.gr
Fax: +30 2610 997 266

Abstract

Steady shear properties and linear and nonlinear viscoelastic behaviors of a poly(methyl methacrylate)–poly(dimethyl amino ethyl methacrylate)–poly(methyl methacrylate) polymer, (PMMA–PDMAEMA–PMMA), telechelic polymers in salt-free aqueous solution have been investigated as a function of concentration and pH. Above a critical concentration, a transient physical network is formed through an association mechanism between hydrophobic end groups, leading to a gel-like behavior. The gel-like polymer solutions were shown to exhibit a peculiar flow behavior, associated with time fluctuation of the transient first normal stress difference, attributed to orientation effects of the stiff charged polymer chains. The viscoelastic behavior was shown to be governed by two pH dependent time scales: a short time scale controlled by the lifetime of the hydrophobic associative junctions and a long time scale corresponding to the network relaxation time. All rheological results show strong evidence that Coulomb interactions, which control both macromolecular chain rigidity and inter-chain interactions, lead to specific pH-tunable properties of great potential interest.

Graphical abstract: pH-Tunable rheological properties of a telechelic cationic polyelectrolyte reversible hydrogel

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Article information

DOI
https://doi.org/10.1039/B601435F
Article type
Paper
Submitted
31 Jan 2006
Accepted
18 Apr 2006
First published
03 May 2006

Soft Matter, 2006,2, 510-516

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pH-Tunable rheological properties of a telechelic cationic polyelectrolyte reversible hydrogel

F. Bossard, T. Aubry, G. Gotzamanis and C. Tsitsilianis, Soft Matter, 2006, 2, 510 DOI: 10.1039/B601435F

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