Intrinsic viscosity and viscoelastic properties of xanthan/guar mixtures in dilute solutions : Effect of salt concentration on the polymer interactions

摘要: Abstract An oscillating capillary rheometer was used to investigate the dynamic viscoelastic and intrinsic viscosity properties of deacetylated xanthan (0.025%), native guar gum (0.075%), xanthan–guar mixtures in dilute solutions. Influence ionic strength on conformation interaction with elaborated. As salt concentration increased, a significant ( P η ′) elasticity ″) values observed for both mixtures. In water 2 mM NaCl solution, relative ″ were much higher than those calculated assuming no interaction, whereas pronounced increase found polysaccharide 40 mM NaCl. The viscosities higher, lower from weight averages two individually, interaction. These results demonstrated that intermolecular has occurred between NaCl, but may not occur mutual incompatibility occur. suggest degree disordering played critical role explain differences ′, ″, measurements 2