Polypropylene storage modulus

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 drop in storage modulus after ageing?

The drop in storage modulus after ageing, ageing is of the order of 14% for pure polypropylene, 11% for PP/CB composite and 8% for PP/talc composite. 1. Introduction Polypropylene (PP) is one of the most versatile polymers. It is used both as a thermoplastic and as a fiber.

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 elongation storage modulus?

Variation of Elongation Storage Modulus Fig. 9 shows the variation curves of the elongation storage modulus (E′) as a function of temperature for the three unaged materials (PP, PP/talc, and PP/CB). This modulus represents the elastic stiffness of the material.

Does temperature affect elongation conservation modulus?

Fig. 10 presents the variation curves of the elongation conservation modulus (E′) as a function of temperature for pure PP, PP/talc, and PP/CB after exposure at the temperature of 50°C for 7 days. It can be seen that the modulus E′ drops significantly for all three materials after thermal ageing compared to the cases of unaged materials (Fig. 7).

Does reinforcing polypropylene improve thermal and mechanical properties?

The obtained results indicate that reinforcing polypropylene with mineral particles generally enhances its thermal and mechanical properties. After ageing, the degradation temperature of PP increases by 3% when 4% talc is added, whereas this increase is of the order of 0.2% when 4% carbon black is added.