Storage modulus and yield strength

What is storage modulus?

Storage modulus is defined as a measure of the stored energy in a material that behaves elastically, indicating its ability to resist deformation under applied stress. It transitions from a flat response characteristic of an elastic gel to a dependence on frequency, reflecting a viscoelastic liquid behavior as surfactant concentration increases.

How does a larger storage modulus affect a better extruded plastic?

A larger storage modulus in an extruded plastic can result in higher melt strength in the plastic. The higher melt strength in the plastic results in a better extruded profile and film. T melt strength can be defined as the maximum force required to break an extruded strand of film.

How does a higher storage modulus affect die swell?

A higher storage modulus and melt strength will enable the plastic to be stretched more and result in a stronger plastic film or extruded part. Higher storage modulus in a plastic can lead to higher die swell due the increase in normal forces in the plastic.

Does the storage modulus yield liquids?

The object of this study was definitely yielding liquids, and this was confirmed by the frequency independence of the storage modulus (Figure 7 a). However, the experimental data were also presented in the form of flow curves within the domain of the maximal Newtonian viscosity (Figure 7 b).

What is the difference between elastic modulus and storage modulus?

The storage modulus can reflect the elastic potential energy stored in the specimen, therefore the variation trend of storage modulus is almost the same as that of elastic modulus. The storage modulus shows a nonlinear trend under all frequencies with the temperature increasing.

How does temperature affect storage modulus?

The storage modulus shows a nonlinear trend under all frequencies with the temperature increasing. Furthermore, there is a sharp drop of storage modulus during the temperature interval of 326 K–362 K, called the glass transition region.