Storage modulus diagram

What is a storage modulus?

The storage modulus is a measure of how much energy must be put into the sample in order to distort it. The difference between the loading and unloading curves is called the loss modulus, E ". It measures energy lost during that cycling strain. Why would energy be lost in this experiment? In a polymer, it has to do chiefly with chain flow.

What is the difference between loss moduli and storage modulus?

At low frequencies, both the storage and the loss moduli have about the same value of 30 kPa. The material is in the flow range. Flow relaxation causes the G′′-peak at about 10−6 Hz. Afterward, the storage modulus exhibits the rubbery plateau with a modulus value that is a little less than 1 MPa.

What is storage modulus in tensile testing?

Some energy was therefore lost. The slope of the loading curve, analogous to Young's modulus in a tensile testing experiment, is called the storage modulus, E '. The storage modulus is a measure of how much energy must be put into the sample in order to distort it.

What is the frequency range of a storage modulus?

The material is in the flow range. Flow relaxation causes the G′′-peak at about 10−6 Hz. Afterward, the storage modulus exhibits the rubbery plateau with a modulus value that is a little less than 1 MPa. The corresponding frequency range is between 10−5 and 10−2 Hz.

How does temperature affect a loss modulus compared to a storage modulus?

The curves measured at temperatures lower than the reference temperature are shifted to higher frequencies in such a way that the individual curves of the storage modulus and the loss modulus overlap to the greatest possible extent with the corresponding composite curves so formed.

What is elastic storage modulus?

Elastic storage modulus (E′) is the ratio of the elastic stress to strain, which indicates the ability of a material to store energy elastically. You might find these chapters and articles relevant to this topic. The storage modulus determines the solid-like character of a polymer.