Abstract
The rheological properties exhibited by gums make its use in applications interesting, such as foods, cosmetics, enhanced oil recovery, or constructions materials. Regardless of application field, the effect of temperature on these properties is of great importance, since these properties can be modified and cause the gum not to be useful for those conditions. Diutan and rhamsan gums are biopolymers, belonging to the sphingans, with similar structures which differ in the substituents of their side chains. It is known that both gums exhibit suitable viscoelastic properties and flow behavior when used as a stabilizer, gelling agent, or thickener. Both gums are widely used in food industry, personal care products, construction materials, oil operations, etc. For this reason, to know the effect of the temperature on their rheological properties is very helpful. For this purpose, small amplitude oscillatory shear measurements and flow curves, as a function of the temperature from 10 °C to 60 °C, have been performed, and the results obtained for both gums compared. The obtained results provide interesting information from an industrial point of view, since they reveal that the rheological properties remained almost unaltered in the temperature range assessed with diutan gum aqueous solutions, being slightly more viscous and viscoelastic than rhamsan gum solutions.
Highlights
The rheological properties of macromolecular solutions are important in many industrial fields, such as the food industry, pharmaceutical and cosmetics, in the paper industry, in enhanced oil recovery (EOR), in water treatment, etc
In order to study the viscoelastic behavior of gums studied, the linear viscoelastic regions were
A comparison of results obtained for both gums does not provide additional information to that obtained in previous sections, namely the aqueous solutions of diutan gum are slightly more viscous and viscoelastic than those of rhamsan gum, and both solutions exhibit high thermal stability within the temperature range studied (10–60 ◦ C)
Summary
The rheological properties of macromolecular solutions are important in many industrial fields, such as the food industry, pharmaceutical and cosmetics, in the paper industry, in enhanced oil recovery (EOR), in water treatment, etc. Gum diutan and rhamsan gum belong to that group of water-soluble polymers of high molecular weight. They are exopolysaccharides (EPS) belonging to the sphingans, as well as gellan gum or wellan gum [1,3,4]. It is important to know the rheological properties of these gums in solution and the modifications that these properties undergo when the temperature varies. This information is of great interest in numerous industrial processes and in the conditions of use and application of them. In order to reach this objective, stress and frequency sweep measurements and steady state tests were performed
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