The Figure demonstrates typical measurements from rheology
Typical Materials Tested on a Rheometer
Suspensions, emulsions, foam, paint, coatings, adhesives, cosmetics, food, personal care products, gels, and hydrogels
Sample Requirements
The sample size and type depends on the measurement and geometry
Summary of Technique
Rheometer measures both viscosity and viscoelasticity of fluids, semi-solids and solids. In a rheological measurement stress, strain (shear rate) are all calculated signals. The raw signals behind the scene are torque, angular displacement and angular velocity.
Viscosity- defined as a materials resistance to deformation and as a function of shear rate or stress with time and temperature dependence.
Viscoelasticity- is a property of a material that exhibits both viscous and elastic character.
Common testing methods are:
Stress and strain sweep
Time sweep
Frequency sweep
Temperature ramp
Temperature sweep
Stress relaxation
Information Provided
Los modulus, storage modulus, tan delta with respect to time, temperature, frequency and stress/strain
Yield stress
Non-Newtonian viscous behavior
Thixotropy
Elasticity
Stress relaxation
Viscosity
Curing rates
Flow behaviors
Crosslinking density
Stability of materials
Lab Location and Contact Information
Location: Thermal Analysis, Rheology, and Polymer Processing Lab
Point of Contact: Dennis Ndaya dennis.ndaya@uconn.edu
860-486-4075
