Multiple shear-banding transitions in a supramolecular polymer solution.
We report on the nonlinear rheology of a reversible supramolecular polymer based on hydrogen bonding. The coupling between the flow-induced chain alignment and breakage and recombination of bonds between monomers leads to a very unusual flow behavior. Measured velocity profiles indicate three different shear-banding regimes upon increasing shear rate, each with different characteristics. While the first of these regimes has features of a mechanical instability, the second shear-banding regime is related to a shear-induced phase separation and the appearance of birefringent textures. The shear-induced phase itself becomes unstable at very high shear rates, giving rise to a third banding regime.
van der Gucht
J
J
Laboratory of Physical Chemistry and Colloid Science, Wageningen University, PO Box 8038, 6700 EK Wageningen, The Netherlands. jasper.vandergucht@wur.nl
Lemmers
M
M
Knoben
W
W
Besseling
N A M
NA
Lettinga
M P
MP
D001703:Biophysics / Q000379:methods*; D006860:Hydrogen Bonding; D046911:Macromolecular Substances; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D011108:Polymers / Q000737:chemistry*; D012212:Rheology; D013314:Stress, Mechanical; D013696:Temperature; D014050:Toluene / Q000737:chemistry
D046911:Macromolecular Substances; D011108:Polymers; D014050:Toluene