The rheology of xanthan solutions is strongly influenced by molecular association and aggregation. The relationship between theological behavior and molecular association has been studied using dynamic oscillatory measurements, step-shear-rate measurements, and optical birefringence. For solutions with concentrations of 0.5% wt or below, weak association—possibly through hydrogen bonding—leads to nonlinear behavior in dynamic oscillatory measurements at high strain. For concentrations of 1% and above, liquid crystalline domains are formed and the time required to approach a steady viscosity value at low shear rates is quite long.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering