Rheological behavior of waterborne polyurethane (PU) dispersion was investigated with small-amplitude oscillatory shear flow experiments. The rheological properties of these environmentally friendly dispersions were found to be dependent on composition and degree of postneutralization. The complex viscosity of the polyurethane dispersions increased at critical concentration of polyurethane, below which the viscosity increased slightly with composition. The results indicate a number of similarities to critical gelling gelling systems, indicating that a more complicated theory that explicitly takes the intrinsic interaction, concentration, and size distribution of the PU.
All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry