High G and G

1. What is G and G in rheology?
2. What does a high loss modulus mean?
3. What is a Rheogram?
4. What does a Rheologist do?

What is G and G in rheology?

The G' refers to the elastic modulus, and reflects elastic behavior of a material when deformed. The G" refers to the viscous modulus, which reflects the flow of a material while it is deformed. ... This is viscous flow. Many real materials, including many polymers, will exhibit some elastic and some flow behavior.

What does a high loss modulus mean?

It represents the energy stored in the elastic structure of the sample. If it is higher than the loss modulus the material can be regarded as mainly elastic, i.e. the phase shift is below 45°. The loss modulus represents the viscous part or the amount of energy dissipated in the sample.

What is a Rheogram?

A flow curve – also known as a rheogram – is a graphical representation of how a flowing material (fluid) behaves when it is subjected to increasing or decreasing shear rates. The corresponding shear stress and viscosity are calculated from the instrument's parameters.

What does a Rheologist do?

Rheometers are instruments used to characterize the rheological properties of materials, typically fluids that are melts or solution. These instruments impose a specific stress field or deformation to the fluid, and monitor the resultant deformation or stress.