Rheological and structural properties of aqueous solutions of a hydrophobically modified polyelectrolyte and its unmodified analogue

Hydrodynamic properties of some cationic amphiphilic polysaccharides in dilute and semi-dilute aqueous solutions

“…Several viscometric studies made with aqueous solutions of amphiphilic polyelectrolytes revealed the balance between the forces acting in a solution for dilute and semi-dilute concentrated regimes (Bataille, Huguet, Muller, Mocanu, & Carpov, 1997;Knudsen, Lauten, Kjøniksen, & Nyström, 2004;Mocanu, Carpov, Chapelle, Merle, & Muller, 1995;Nichifor, Stanciu, & Zhu, 2004). The increase in viscosity is due to electrostatic repulsions between charges and/or intermolecular hydrophobic associations, and the decrease in viscosity is a result of intramolecular hydrophobic associations.…”

Characterization of Methylprednisolone Esters of Hyaluronan in Aqueous Solution: Conformation and Aggregation Behavior

“…This behavior, observed also at very low shear rates, suggests the existence of extremely deformable aggregates. 27 Furthermore, we have observed that both functionalized biopolymers are less viscous than HA, thus suggesting the breakage of the hydrogen-bond network, which is responsible for the stiffness of the HA molecule according to the proposed model. 28,29 The viscosity values for the two HYC141 systems considered are quite similar, albeit the viscosity seems to decrease by increasing the degree of functionalization.…”

The effects of entanglement concentration on the hydrodynamic properties of cereal starches

“…Figure also indicates that the slope of the linear curve begins to enhance significantly when the concentrations increase ( c > 0.7 g L −1 ) for waxy and normal rice starch solutions, while the η red values progressively increase at the initial concentrations (approximately <1.0 g L −1 ), followed by a nearly smooth line for normal maize and wheat starch solutions. Thus, compared to normal maize and wheat solutions, the behavior of the waxy and normal rice solutions shows more pronounced intermolecular hydrophobic interactions …”